AMERICAN CENTURY MUNICIPAL TRUST
N-30D, 1997-07-25
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                                 ANNUAL REPORT

                             [american century logo]
                                    American
                                  Century(sm)

                                  May 31, 1997

                                     BENHAM
                                     GROUP

                             Tax-Free Money Market
                           Intermediate-Term Tax-Free
                               Long-Term Tax-Free

[front cover]

                               TABLE OF CONTENTS

Report Highlights........................................... 1
Our Message to You.......................................... 2
Period Overview............................................. 3
Municipal Credit Review..................................... 4
Tax-Free Money Market
   Performance Information.................................. 5
   Management Q & A......................................... 6
   Schedule of Investments.................................. 8
   Financial Highlights.....................................30
Intermediate-Term Tax-Free
   Performance Information..................................11
   Management Q & A.........................................12
   Schedule of Investments..................................15
   Financial Highlights.....................................31


Long-Term Tax-Free
   Performance Information..................................18
   Management Q & A.........................................19
   Schedule of Investments..................................22
   Financial Highlights.....................................32
Statements of Assets and Liabilities........................25
Statements of Operations....................................26
Statements of Changes in Net Assets.........................27
Notes to Financial Statements...............................28
Independent Auditors' Report................................33
Background Information
   Investment Philosophy & Policies.........................36
   Comparative Indices......................................36
   Lipper Rankings..........................................36
   Portfolio Management Team................................36
Glossary....................................................37

American Century  Investments offers you nearly 70 fund choices covering stocks,
bonds, money markets,  specialty investments and blended portfolios. To help you
find the funds that may meet your needs, we have divided  American Century funds
into three groups based on investment style and objectives.  These groups, which
appear below, are designed to help simplify your fund decisions.


                  American Century Investments--Family of Funds


       BENHAM GROUP           AMERICAN CENTURY GROUP     TWENTIETH CENTURY GROUP

    MONEY MARKET FUNDS          ASSET ALLOCATION &
   GOVERNMENT BOND FUNDS          BALANCED FUNDS            U.S. GROWTH FUNDS
  DIVERSIFIED BOND FUNDS     CONSERVATIVE EQUITY FUNDS     INTERNATIONAL FUNDS
   MUNICIPAL BOND FUNDS           SPECIALTY FUNDS
   Tax-Free Money Market
Intermediate-Term Tax-Free
    Long-Term Tax-Free


We welcome your comments or questions about this report.  
See the back cover for ways to contact us by mail, phone or e-mail.

Twentieth  Century and the Benham Group are registered marks of American Century
Services Corporation and Benham Management Corporation,  respectively.  American
Century is a service mark of American Century Services Corporation.


                                                    American Century Investments


                               REPORT HIGHLIGHTS

Period Overview

o    The U.S.  economy grew at a healthy pace during the 12 months ended May 31,
     1997, while inflation remained relatively tame.

o    The Federal  Reserve raised  short-term  interest rates in late March in an
     attempt to head off potential inflation going forward.

o    Municipal bonds produced solid returns for the period.

o    Low levels of new municipal debt issuance supported municipal bond prices.

Municipal Credit Review

o    Strong U.S. economic growth led to improved municipal credit quality during
     the period.

o    Despite the generally positive  municipal credit outlook,  federal policies
     related to health care and welfare reform may pose  longer-term  challenges
     to local governments.

Tax-Free Money Market

o    The fund slightly  outperformed  its Lipper peer group  average  during the
     fiscal year ended May 31, 1997.

o    Benham  Management  Corporation  will waive its management fee for one year
     beginning August 1, 1997. We've also lowered the fund's expense cap from 67
     to 50 basis points.

o    Going  forward,  we'll look for  opportunities  to add  one-year  municipal
     securities at attractive yields relative to shorter-term securities.

Intermediate-Term Tax-Free

o    The fund slightly  underperformed  its Lipper peer group average during the
     fiscal year ended May 31, 1997.

o    We sold many of the attractively priced California  municipal securities we
     purchased in the aftermath of the Orange County bankruptcy at a profit.

o    The proposed merger with the Benham Intermediate-Term  Tax-Exempt fund will
     have  no  effect  on  this  fund's  investment  management,  objectives  or
     policies.

o    Going forward,  we plan to use a conservative,  value-oriented  approach to
     managing the fund.

Long-Term Tax-Free

o    The fund strongly  outperformed  its Lipper peer group  average  during the
     fiscal year ended May 31, 1997.

o    We made  only  minor  adjustments  to the  fund's  maturity  and  duration,
     concentrating instead on adding attractively valued securities to the fund.

o    The proposed merger with the Benham Long-Term  Tax-Exempt fund will have no
     effect on this fund's investment management, objectives or policies.

o    Going forward,  we think slower  economic  growth could cause the municipal
     market to rally,  so we plan to keep the fund's  duration  slightly  longer
     than the peer group average.


                                    Tax-Free
                                  Money Market
                      Total Returns:         AS OF 5/31/97
                         6 Months                   1.51%*
                         1 Year                      2.98%
                      7-Day Current Yield:           3.32%
                      Net Assets:            $85.7 million
                         (AS of 5/31/97)
                      Inception Date:              7/31/84
                      Ticker Symbol:                 BNTXX

                               Intermediate-Term
                                    Tax-Free
                      Total Returns:         AS OF 5/31/97
                         6 Months                   1.23%*
                         1 Year                      6.16%
                      Net Assets:            $60.7 million
                         (AS of 5/31/97)
                      Inception Date:              7/31/84
                      Ticker Symbol:                 BNTIX

                               Long-Term Tax-Free
                      Total Returns:         AS OF 5/31/97
                         6 Months                   1.76%*
                         1 Year                      8.41%
                      Net Assets:            $52.0 million
                         (AS of 5/31/97)
                      Inception Date:              7/31/84
                      Ticker Symbol:                 BTFLX

                      * Not annualized.


Annual Report                                             Report Highlights    1


                               OUR MESSAGE TO YOU

[photo of James E. Stowers III and James M. Benham]

During the fiscal  year ended May 31,  1997,  investors  in the Benham  Tax-Free
funds earned solid,  competitive  returns as municipal  securities  outperformed
Treasurys for most of the period. The extended economic expansion that propelled
U.S.  stock markets to new highs also benefited  municipal and corporate  bonds,
and low levels of inflation  provided bond  investors  with higher real rates of
return.  Improving  real estate values and low  unemployment  across the country
boosted tax receipts for local  governments,  leading to credit quality upgrades
on many municipal bond issues.

American  Century's  municipal bond  management  team is well positioned to take
advantage  of  attractive  opportunities  in  the  municipal  markets.  We  have
continued to expand our very talented team of municipal  credit  analysts,  most
recently  adding  David  Moore,  who comes to us from  Keystone  Investments  in
Boston.  David will contribute an important East Coast  perspective to the team.
The credit team  contributed  significantly  to our ability to find  undervalued
municipal securities that ultimately enhanced fund returns.

 We also  strengthened  our  corporate  team.  In  June,  Bill  Lyons,  American
Century's  chief  operating   officer,   was  named  president,   assuming  full
responsibility for the company's day-to-day  operations.  This change will allow
James  E.  Stowers  III to  focus  more  time on  developing  and  refining  new
investment  technologies  and tools that build on and leverage  the  proprietary
system his father  pioneered 25 years ago. One of our goals is to ensure that we
continue to evolve and  innovate--building  the investment tools today that will
help lead us and our investors to success in the next century.

The proposed  merger of the Benham  Intermediate-  and  Long-Term  Term Tax-Free
funds  with  the  Intermediate-  and  Long-Term   Tax-Exempt  funds  is  another
opportunity  for us to improve  the way we serve  you.  Our aim is to reduce the
number of  overlapping  funds that resulted  when Benham  merged with  Twentieth
Century.  Combining  similar funds not only creates  greater  efficiencies,  but
should allow fund managers to focus more of their  attention on each  individual
fund.

We appreciate your confidence in American Century and look forward to continuing
to serve you.

Sincerely,

/s/James E. Stowers III                     /s/James M. Benham 
James E. Stowers III                        James M. Benham
President and Chief Executive Officer       Vice Chairman
American Century Companies                  American Century Companies


2    Our Message to You                             American Century Investments


                                PERIOD OVERVIEW

U.S. Economy

The U.S. economy grew at a healthy pace during the 12 months ended May 31, 1997.
After  expanding  at a 2.2% annual rate in the third  quarter of 1996,  the U.S.
economy surged ahead at an impressive 3.8% rate in the fourth quarter.  Economic
growth hit a ten-year high of 5.9% in the first quarter of 1997.  Fueling robust
growth were strong  consumer  spending  and rising  consumer  confidence,  which
reached a 28-year high in April. In addition,  the  unemployment  rate fell from
5.4% in January to a 23-year low of 4.8% in May.

Inflation--as  measured by the  government's  consumer  price  index--rose  at a
modest 1.4%  annual  rate  during the first five months of 1997.  That stands in
sharp contrast to 1996, when prices rose by 3.6% --the largest yearly gain since
1990.

Concerned  that vigorous  economic  growth might lead to higher  inflation,  the
Federal Reserve (the Fed) raised  short-term  interest rates in March--the first
such increase since  February 1995.  Though the Fed held rates steady at its May
interest  rate  policy  meeting,  tight labor  markets and strong  manufacturing
activity have kept market participants from ruling out another rate hike.

Municipal Bond Market

Municipal  bonds produced  strong  returns as interest  rates  declined  overall
during the 12-month period.  Longer-term  securities,  which usually  appreciate
more than short-term securities when rates fall, performed best. For the period,
the Lehman Long-Term  Municipal Bond Index rose by 10.04%.  The Lehman Five-Year
General Obligation Index rose by 6.09%.

Bond yields fluctuated throughout the period. Yields were at their highest point
at the beginning of the period,  when strong job growth led many to believe that
the Fed was  poised to raise  rates.  However,  expectations  for  higher  rates
softened  after  economic  growth  moderated  in the third  quarter  and the Fed
continued to hold interest  rates steady.  Aided by strong demand from insurance
companies,   municipal  bond  prices  rallied  and  yields  fell.  By  December,
short-term  municipal  yields had fallen  nearly 60 basis points from where they
began the period,  while long-term  municipal yields were nearly 70 basis points
lower.

Interest  rates  rose  near  the end of the  first  quarter  of 1997 as signs of
stronger-than-expected  economic  growth  resurrected  fears  that the Fed would
raise rates to keep inflation in check. As a result,  municipal bond yields rose
steadily through April.

Recent data  suggest that the rate of U.S.  economic  growth  slowed  during the
second  quarter,  fueling a municipal  market  rally in May and June.  Municipal
bonds are also  benefiting  from  relatively  low levels of new  municipal  debt
issuance. Although demand from retail investors has tapered off recently, retail
demand was strong  during much of the fiscal year.  Any renewed  surge in demand
would support bond prices and dampen market volatility.

[line graph - data below]

MUNICIPAL YIELD CURVES

Years to Maturity       5/31/96          5/31/97
1                        3.800            3.850
2                        4.150            4.150
3                        4.370            4.350
4                        4.520            4.500
5                        4.640            4.600
6                        4.740            4.660
7                        4.840            4.720
8                        4.940            4.780
9                        5.040            4.840
10                       5.140            4.900
11                       5.230            4.976
12                       5.320            5.052
13                       5.410            5.128
14                       5.500            5.204
15                       5.590            5.280
16                       5.624            5.308
17                       5.658            5.336
18                       5.692            5.364
19                       5.726            5.392
20                       5.760            5.420
21                       5.768            5.426
22                       5.776            5.432
23                       5.784            5.438
24                       5.792            5.444
25                       5.800            5.450
26                       5.804            5.454
27                       5.808            5.458
28                       5.812            5.462
29                       5.816            5.466
30                       5.820            5.470
Source: Bloomberg Financial Markets


Annual Report                                               Period Overview    3


                            MUNICIPAL CREDIT REVIEW

Strong U.S. economic growth led to improved  municipal credit quality during the
12 months ended May 31, 1997.  Economic  expansion and rising property values in
many states increased tax revenues and helped improve municipal budgets.

Municipal credit rating upgrades outpaced  downgrades by more than 3 to 1 during
1996,  the  latest  period for which  data are  available.  The number of credit
upgrades has continued to improve since 1995, when  downgrades last  outnumbered
upgrades.  However,  the trend toward credit upgrades has been slowing in recent
months.

By region,  the Rocky Mountain and  southwestern  states posted strong  economic
growth during 1996 and 1997.  Nevada,  Arizona and Utah  registered  the fastest
employment growth in the nation.  All three boast  unemployment  rates below the
national  average.  Unemployment  has fallen so low in many Mountain states that
future growth may be constrained by a shortage of skilled workers.

The West has a strong and stable credit outlook. A strong,  broad-based economic
expansion led several independent rating agencies to upgrade California's credit
rating in the past year.  Washington  and Oregon  are also  experiencing  strong
growth, fueled by expansion in the high technology and aerospace industries.

The Midwest  continued to grow at a relatively  steady pace,  with  unemployment
rates  well below the  national  average.  Due to its low  business  costs,  the
Southeast also remained healthy,  with several states recently  receiving rating
upgrades. The Great Lakes areas,  Louisiana,  the Mid-Atlantic and the Northeast
continued  to lag the rest of the nation,  but even these  regions saw  improved
economic conditions in 1996 and so far in 1997.

General  obligation bonds and other forms of  tax-supported  municipal debt have
benefited from the healthy growth of the economy.  Nevertheless,  federal policy
decisions related to health care and welfare reform may pose longer-term  credit
concerns for state and local  governments.  In  addition,  debt issued by public
power entities has been adversely  affected by the  deregulation of the electric
utilities industry.

This  analysis  provides  only a glimpse of  general  municipal  market  trends.
Growing market  complexity and issue  disparities point to a continuing need for
thorough  case-by-case  credit  analysis,  although sector  analysis  remains an
integral element in municipal research.


CREDIT QUALITY TRENDS
(U.S. map)

Improving:
Arizona
California
Colorado
Georgia
Idaho
Massachussetts
Minnesota
Mississippi
Nevada
New Hampshire
New Mexico
North Carolina
Oregon
South Dakota
South Carolina
Tennessee
Texas
Utah
Virginia
Washington
Wisconsin

Stable:
(all other states)


4    Municipal Credit Review                        American Century Investments


<TABLE>
<CAPTION>
                                                   TAX-FREE MONEY MARKET


                                7-Day         7-Day                   7-Day Tax-Equivalent Yields
                               Current      Effective        28%           31%           36%           39.6%
                                Yield         Yield      Tax Bracket   Tax Bracket   Tax Bracket    Tax Bracket

CURRENT YIELDS AS OF MAY 31, 1997
<S>                             <C>           <C>           <C>           <C>           <C>            <C>  
Tax-Free Money Market           3.32%         3.37%         4.61%         4.81%         5.19%          5.50%



                                                                        AVERAGE ANNUAL RETURNS
                                            6 MONTHS       1 YEAR        3 YEARS       5 YEARS       10 YEARS
TOTAL RETURNS AS OF MAY 31, 1997
Tax-Free Money Market ......................  1.51%         2.98%         3.04%         2.63%          3.73%

Average Tax-Exempt Money Market Fund(1) ....  1.48%         2.94%         3.02%         2.62%          3.72%
Fund's Ranking Among Tax-Exempt
Money Market Funds(1) ......................   --      64 out of 136  54 out of 117  45 out of 97  25 out of 58

(1) According to Lipper Analytical Services.
</TABLE>

See pages 36-37 for more information about returns and Lipper fund rankings.

PORTFOLIO AT A GLANCE
                            5/31/97    5/31/96
Number of Securities          48         58
Weighted Average Maturity   53 days    42 days
Expense Ratio                0.67%      0.65%


Money market funds are neither  insured nor  guaranteed by the U.S.  government.
Yields will fluctuate,  and there can be no assurance that the fund will be able
to maintain a stable $1.00 share price.


                Many of the investment terms in this report are
                       defined in the Glossary on page 37.


Annual Report                                         Tax-Free Money Market    5


                             TAX-FREE MONEY MARKET

Management Q & A

An interview  with Bryan  Karcher,  a portfolio  manager on the  Tax-Free  funds
management team.

How did the fund perform?

The fund performed  relatively well. For the fiscal year ended May 31, 1997, the
fund  returned  2.98%,  compared  with  the  2.94%  average  return  of the  136
"Tax-Exempt Money Market Funds" tracked by Lipper Analytical Services.  (See the
Total  Returns   table  on  the  previous   page  for  other  fund   performance
comparisons.)

How was the fund positioned during the period?

We initially allowed the fund's average maturity to decline because of a lack of
attractively  priced  one-year  municipal  securities  (munis).  For much of the
period,  one-year munis traded in a range between 3.55% and 3.65%,  which was an
insufficient  yield pick-up over shorter-term  munis considering the outlook for
interest  rates.  With the  expectation  that  the Fed  would  eventually  raise
short-term  interest  rates,  it didn't make sense to purchase  relatively  low-
yielding one-year securities. Instead, we preferred to hold variable-rate demand
notes that reset  their  interest  rates  quickly to better  capture the rise in
rates.

As a result,  we allowed the fund's average maturity to fall to a low of 20 days
at the  beginning  of April,  compared  with a 43-day  average  maturity for the
fund's peers.  The fund's shorter  maturity  proved  beneficial when the Federal
Reserve raised  short-term  interest rates in late March.  (Reducing the average
maturity in a rising interest rate environment  allowed the fund to more quickly
reinvest matured assets in higher-yielding securities.)

But you aggressively extended the fund's average maturity in April. Why?

We lengthened  the fund's  maturity  because  one-year munis began to offer more
attractive  yields.  We were able to buy one-year  notes at an average  yield of
4.05%. We used this buying  opportunity to extend the fund's average maturity to
around 50 days by early May. That extension  proved timely as yields on one-year
munis dropped back down to around 3.85% by early June.

Why were one-year  securities more attractive in April compared with the rest of
the period?

One-year note yields rose in April in part because of  expectations  for further
Fed rate hikes,  despite the fact that the economy  was  slowing.  That  concern
caused the spread,  or difference in yield,  between  shorter paper and one-year
securities to widen, making one-year munis more attractive.  In addition,  money
market fund  outflows  typically  increase  during the April tax  season.  These
outflows  reduce the demand for notes and may  actually  cause money market fund
managers to sell notes if redemptions are greater than expected.

[pie charts]

PORTFOLIO  COMPOSITION  BY SECURITY TYPE (as of 5/31/97) 
VRDNs 59% 
Bonds less than 1 Year 16% 
Commercial Paper 15% 
Municipal Notes 10%

PORTFOLIO  COMPOSITION  BY SECURITY  TYPE (as of 11/30/96)  
VRDNs 73%  
Municipal Notes 10% 
Commercial Paper 9% 
Bonds less than 1 Year 8%


6    Tax-Free Money Market                          American Century Investments


                             TAX-FREE MONEY MARKET

You increased the fund's weighting of commercial paper in May. Why?

We typically  increase  the fund's  weighting  of  commercial  paper each May to
lengthen the fund's average maturity. We use these securities to bridge June and
July,  when a flood of coupon  payments and maturing  securities  tends to cause
short-term  muni yields to fall. So far,  however,  demand for short-term  paper
hasn't been as strong as in years past--we suspect that many investors have been
putting  their  available  cash to work in the stock market.  As a result,  muni
rates  haven't  fallen as  sharply  as they  typically  do.  Nevertheless,  many
municipal  notes  mature in July,  which should bring some cash back to the muni
market.

Benham Management  Corporation is preparing to waive its management fee. Can you
explain?

Sure. Benham  Management  Corporation will waive its management fee for one year
beginning August 1, 1997. When the fund resumes paying expenses,  it will have a
lower contractual  expense cap-- 50 basis points,  compared with the current cap
of 67 basis  points.  Lower  expenses  can  translate  into  higher  yields  for
shareholders.

What's your outlook for interest rates going forward?

Our current  expectation is that economic  growth will continue to slow from its
breakneck  first-quarter pace. Inflation seems tame, having risen just 2.2% over
the last 12 months.  In  addition,  the "real"  federal  funds rate (the nominal
federal funds rate minus the  inflation  rate) is already at a level that should
inhibit  economic growth.  As a result,  we think further Fed rate increases are
unlikely.  Nevertheless, if wage pressures increase, fear of a Fed rate hike may
send short-term muni yields higher.

With this outlook in mind, what are your plans for the fund going forward?

We will look for  opportunities  to add more  one-year  paper to the fund in the
coming months if it looks  attractive  relative to  shorter-term  munis.  But we
won't buy  one-year  paper solely to maintain a longer  average  maturity--we're
only going to buy securities that we feel provide  sufficient yield pick-up over
shorter-term munis based on the interest rate outlook.

[pie charts]

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/97)
SP1+ 78%
SP1 22%

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 11/30/96)
SP1+ 79%
SP1 21%


Annual Report                                         Tax-Free Money Market    7


                            SCHEDULE OF INVESTMENTS
                             TAX-FREE MONEY MARKET

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

SHORT-TERM MUNICIPAL SECURITIES
ARIZONA-1.2%
$ 1,000,000   East Valley Institute of Technology
                District No. 401, Series 1994 B,
                4.00%, 7/1/97 (AMBAC)                            $1,000,000
                                                                 ----------
CALIFORNIA-5.7%
  1,950,000   California Rev. Anticipation Notes,
                Series A, 4.50%, 6/30/97                          1,950,789
  3,000,000   Orange County Local Transportation
                Auth. Sales Tax Rev. Commercial
                Paper, 3.75%, 7/18/97 (LOC:
                Union Bank of Switzerland)                        3,000,000
                                                                 ----------
                                                                  4,950,789
                                                                 ----------
COLORADO-5.2%
  1,000,000   Colorado Tax and Rev. Anticipation
                Notes, Series A, 4.50%, 6/27/97                   1,000,405
  3,500,000   Denver Multi-Family Housing Rev.,
                Series A, (Cottonwood Creek
                Project), VRDN, 4.25%, 6/3/97
                (LOC: GE Capital Corp.)                           3,500,000
                                                                 ----------
                                                                  4,500,405
                                                                 ----------
FLORIDA-17.1%
  2,000,000   Broward County Housing Finance
                Auth. Multi-Family Housing Rev.,
                Series A, (Palmaire-Oxford),
                VRDN, 4.20%, 6/4/97 (SBBPA:
                Continental Casualty Co.)                         2,000,000
  1,000,000   City of Jacksonville Commercial
                Paper, 3.90%, 7/18/97 (LOC:
                Bayerische Landesbank
                Girozentrale and Suntrust Bank,
                Miami)                                            1,000,000
  1,435,000   Florida Housing Finance Agency
                Rev., Series 1989 E, VRDN,
                4.15%, 6/4/97 (LOC: Comerica
                Bank)                                             1,435,000
  2,000,000   Florida Housing Finance Agency
                Rev., (Country Club Apartments), 
                VRDN, 4.15%, 6/2/97 (LOC:
                Northern Trust Company)                           2,000,000
  2,400,000   Florida Housing Finance Auth.
                Multi-Family  Housing  Rev.,  Series 
                1990 B,  (Belville-Oxford),
                VRDN, 4.20%, 6/4/97 (SBBPA:
                Continental Casualty)                             2,400,000

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 1,000,000   Jacksonville Electric Rev.
                Commercial Paper, 3.90%,
                7/18/97 (LOC: Credit Suisse
                First Boston, Inc.)                            $  1,000,000
  2,000,000   Jacksonville Electric Rev.
                Commercial Paper, 3.75%,
                8/8/97 (SBBPA: Morgan
                Guaranty Trust Co. of New York)                   2,000,000
  1,000,000   Marion County Housing Finance
                Auth. Multi-Family Housing Rev.,
                Series F, (Paddock Place Project),
                VRDN, 4.00%, 6/5/97 (LOC:
                Suntrust Bank, Atlanta)                           1,000,000
  2,000,000   Sunshine State Government
                Financing Committee Commercial
                Paper, 3.75%, 8/8/97 (LOC:
                National Westminster Bank PLC,
                Union Bank of Switzerland, and
                Morgan Guaranty Trust Co. of
                New York)                                         2,000,000
                                                                 ----------
                                                                 14,835,000
                                                                 ----------
GEORGIA-2.1%
  1,800,000   Cobb County Multi-Family Housing
                Rev., Series 1996, (Terrell Mill),
                VRDN, 4.10%, 6/4/97 (LOC:
                GE Capital Corp.)                                 1,800,000
                                                                 ----------
HAWAII-3.0%
  2,600,000   Hawaii State Housing Finance and
                Development Corporation Rev.,
                (Affordable Rental Housing),
                VRDN, 3.95%, 6/4/97 (LOC:
                Banque Nationale De Paris S.A.)                   2,600,000
                                                                 ----------
ILLINOIS-10.0%
  1,625,000   Bartlett Multi-Family Housing Rev.,
                Series A, (Bartlett Square
                Apartments), VRDN, 3.95%,
                6/5/97 (LOC: La Salle National
                Bank)                                             1,625,000
  3,000,000   Illinois Health Facility Auth. Rev.,
                Series 1985 B, (Methodist
                Medical Center), VRDN, 4.05%,
                6/4/97 (LOC: Sumitomo Ltd.)                       3,000,000
  2,000,000   Illinois Health Facility Auth. Rev.,
                Series 1996 B, (Franciscan
                Eldercare), VRDN, 3.95%,
                6/4/97 (LOC: ABN Amro
                Bank N.V.)                                        2,000,000

See Notes to Financial Statements


8    Tax-Free Money Market                          American Century Investments


                            SCHEDULE OF INVESTMENTS
                             TAX-FREE MONEY MARKET
MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 2,000,000   McCook Village Rev., Series 1996 B,
                (St. Andrew Society), VRDN,
                3.90%, 6/5/97 (LOC: Northern
                Trust Company)                                   $2,000,000
                                                                 ----------
                                                                  8,625,000
                                                                 ----------
INDIANA-4.1%
  1,000,000   Huntington Economic Development
                Rev., (Allied Signal Inc. Project),
                VRDN, 4.05%, 6/4/97
                (Corporate Guarantee: Allied
                Signal Inc.)                                      1,000,000
    500,000   Lawrenceburg Multi-School
                Building Corporation Rev., 4.00%,
                8/1/97 (FSA)                                        500,000
  2,100,000   Westfield Economic Development
                Rev., (Porter Project), VRDN,
                4.00%, 6/5/97 (LOC: Bank
                of America)                                       2,100,000
                                                                 ----------
                                                                  3,600,000
                                                                 ----------
KANSAS-2.3%
  2,000,000   Burlington Pollution Control Rev.,
                Series 1985 A, Commercial
                Paper, 3.70%, 7/25/97
                (LOC: Toronto Dominion Bank)                      2,000,000
                                                                 ----------
KENTUCKY-4.3%
  1,320,000   Kentucky Housing Corp. Rev.,
                Series D, 4.00%,12/31/97
                (GIC: Bayerische Landesbank
                Girozentrale)                                     1,320,000
  2,400,000   Mayfield Multi-City Lease Rev.,
                Series 1996, VRDN, 4.15%,
                6/4/97 (LOC: PNC Bank)                            2,400,000
                                                                 ----------
                                                                  3,720,000
                                                                 ----------
LOUISIANA-9.7%
  2,000,000   Calcasieu Parish Sales Tax Rev.,
                (District No. 4-A Sales and
                Use Tax), VRDN, 3.90%, 6/5/97
                (LOC: National Westminster
                Bank PLC)                                         2,000,000
    800,000   Louisiana Public Facility Auth. Rev.,
                (Green Briar Hospital), VRDN,
                4.05%, 6/4/97 (LOC: Societe
                Generale)                                           800,000

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 3,000,000   Louisiana Public Facility Auth. Rev.,
                (Linlake Ventures), VRDN, 3.95%,
                6/2/97 (LOC: Lincoln National
                Corp.)                                           $3,000,000
  2,600,000   South Louisiana Port Commission
                Rev., Series 1997, (Holnam Inc.
                Project), VRDN, 4.00%, 6/4/97
                (LOC: ABN Amro Bank N.V.)                         2,600,000
                                                                 ----------
                                                                  8,400,000
                                                                 ----------
MISSOURI-5.2%
  2,500,000   Missouri Housing Development
                Commission Mortgage Rev.,
                4.05%, 4/15/98 (GIC: AMBAC)                       2,500,000
  2,000,000   Missouri Industrial Development
                Board Rev., Series 1989, VRDN,
                4.30%, 6/4/97 (LOC: Dai-Ichi
                Kangyo Bank, Ltd. and Industrial
                Bank of Japan)                                    2,000,000
                                                                 ----------
                                                                  4,500,000
                                                                 ----------
MONTANA-2.3%
  2,000,000   Montana Tax and Rev. Anticipation
                Notes, 4.50%, 6/27/97                             2,001,119
                                                                 ----------
NEVADA-0.9%
    800,000   Clark County Industrial
                Development Rev., Series
                1995 A, (Nevada Power), VRDN,
                4.15%, 6/4/97 (LOC: Barclays
                Bank PLC)                                           800,000
                                                                 ----------
NEW MEXICO-3.7%
  2,200,000    Farmington Pollution Control Rev.,
                Series 1997 A, (San Juan
                Project), VRDN, 4.05%, 6/4/97
                (LOC: Bank of America)                            2,200,000
  1,000,000   Santa Fe Gross Receipts Tax Rev.,
                Series A, 3.90%,
                6/1/97 (AMBAC)                                    1,000,000
                                                                 ----------
                                                                  3,200,000
                                                                 ----------

See Notes to Financial Statements


Annual Report                                         Tax-Free Money Market    9


                            SCHEDULE OF INVESTMENTS
                             TAX-FREE MONEY MARKET
MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

OHIO-6.1%
$ 3,255,000   Ohio State Building Auth. Rev.,
                Series A, (Adult Correctional
                Building), 4.50%, 4/1/98                       $  3,265,888
  2,000,000   Ohio State Water Development
                Pollution Control Rev., Commercial
                Paper, Series 1988 A, 3.85%,
                7/16/97 (FGIC, General
                Electric Capital Corp. Liquidity)                 2,000,000
                                                                 ----------
                                                                  5,265,888
                                                                 ----------
OREGON-1.2%
  1,000,000   Oregon State GO, (Veterans
                Welfare), 4.05%, 2/2/98                           1,000,000
                                                                 ----------
SOUTH CAROLINA-2.3%
  2,000,000   Berkeley County Pollution Control
                Rev., Series 1996, VRDN, 3.90%,
                6/5/97 (LOC: Royal Bank of
                Canada)                                           2,000,000
                                                                 ----------
TENNESSEE-2.3%
  2,000,000   Chattanooga Industrial Development
                Rev., (Market Street Limited
                Project), VRDN, 3.95%, 6/4/97
                (LOC: Credit Suisse First Boston,
                Inc.)                                             2,000,000
                                                                 ----------
TEXAS-5.7%
    575,000   Arlington Hospital Auth. Rev.,
                (Arlington Memorial Hospital),
                5.50%, 12/1/97 (FSA)                                579,932
    500,000   Dallas GO, (Denton and Collin Co.),
                4.20%, 2/15/98                                      500,000
    780,000   Houston Water and Sewer System
                Rev., 8.00%, 12/1/97,
                Prerefunded at 102% of Par(1)                       812,069
  3,000,000   Texas Tax and Rev. Anticipation
                Notes, 4.75%, 8/29/97                             3,005,861
                                                                 ----------
                                                                  4,897,862
                                                                 ----------

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

WASHINGTON-1.2%
$ 1,000,000   Washington State Housing Finance
                Commission Rev., Series 1A,
                4.00%, 4/1/98 (GIC: FGIC)                      $  1,000,000
                                                                 ----------
WISCONSIN-4.4%
  1,800,000   Pleasant Prairie Industrial
                Development Rev., Series 1995,
                (Muskie Enterprises), VRDN,
                4.05%, 6/5/97 (LOC: Bank of
                Montreal)                                         1,800,000
  2,000,000   Whitewater Industrial Development
                Rev., (Mac Lean Fogg Co.
                Project), VRDN, 4.00%,
                6/4/97 (LOC: Bank of America)                     2,000,000
                                                                 ----------
                                                                  3,800,000
                                                                 ----------
TOTAL INVESTMENT SECURITIES-100.0%                              $86,496,063
                                                                ===========

Notes to Schedule of Investments 
AMBAC = AMBAC Indemnity Corp.
FGIC = Financial Guaranty Insurance Company 
FSA = Financial Security Association
GIC = Guaranteed Investment Contract 
GO = General Obligation  
LOC = Letter of Credit 
SBBPA = Standby Bond Purchase Agreement
VRDN = Variable Rate Demand Note.  Interest reset date  is indicated and used in
    calculating the weighted average portfolio maturity. Rate shown is effective
    May 31, 1997.
(1) Escrowed in U.S. Government Securities.

See Notes to Financial Statements


10   Tax-Free Money Market                          American Century Investments


<TABLE>
<CAPTION>
                                                INTERMEDIATE-TERM TAX-FREE

                                             30-Day                  30-Day Tax-Equivalent Yields
                                               SEC           28%           31%           36%           39.6%
                                              Yield      Tax Bracket   Tax Bracket   Tax Bracket    Tax Bracket

CURRENT YIELDS AS OF MAY 31, 1997
<S>                                           <C>           <C>           <C>           <C>            <C>  
Intermediate-Term Tax-Free                    4.30%         5.97%         6.23%         6.72%          7.12%

                                                                        AVERAGE ANNUAL RETURNS
                                            6 MONTHS       1 YEAR        3 YEARS       5 YEARS       10 YEARS
TOTAL RETURNS AS OF MAY 31, 1997
Intermediate-Term Tax-Free .................  1.23%         6.16%         5.64%         6.01%          6.82%
Lehman 5-Year General Obligation Index .....  1.28%         6.08%         5.90%         6.02%          6.82%
Average Intermediate Municipal
Debt Fund(1) ...............................  1.28%         6.23%         5.79%         6.01%          6.98%
Fund's Ranking Among Intermediate
Municipal Debt Funds(1) ....................   --       72 out of 133 61 out of 100 16 out of 36   11 out of 20

(1) According to Lipper Analytical Services.
</TABLE>

See pages 36-37 for more information  about returns,  the comparative  index and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER TEN YEARS
Value on 5/31/97

Intermediate-Term Tax-Free $19,336
Lehman 5-Year GO Index     $19,335

              Intermediate-Term Tax-Free  Lehman 5-Year GO Index
May-87                 $10,000                   $10,000
Jun-87                 $10,208                   $10,211
Jul-87                 $10,397                   $10,329
Aug-87                 $10,379                   $10,349
Sep-87                 $10,000                   $10,001
Oct-87                 $10,095                   $10,148
Nov-87                 $10,297                   $10,270
Dec-87                 $10,426                   $10,383
Jan-88                 $10,742                   $10,639
Feb-88                 $10,832                   $10,746
Mar-88                 $10,751                   $10,705
Apr-88                 $10,835                   $10,803
May-88                 $10,775                   $10,673
Jun-88                 $10,830                   $10,750
Jul-88                 $10,886                   $10,800
Aug-88                 $10,884                   $10,768
Sep-88                 $10,996                   $10,873
Oct-88                 $11,122                   $10,967
Nov-88                 $11,047                   $10,909
Dec-88                 $11,117                   $10,939
Jan-89                 $11,246                   $11,096
Feb-89                 $11,141                   $10,978
Mar-89                 $11,087                   $10,908
Apr-89                 $11,278                   $11,096
May-89                 $11,469                   $11,297
Jun-89                 $11,562                   $11,421
Jul-89                 $11,727                   $11,588
Aug-89                 $11,660                   $11,543
Sep-89                 $11,647                   $11,548
Oct-89                 $11,745                   $11,558
Nov-89                 $11,933                   $11,705
Dec-89                 $12,039                   $11,800
Jan-90                 $12,069                   $11,806
Feb-90                 $12,125                   $11,894
Mar-90                 $12,078                   $11,857
Apr-90                 $12,020                   $11,819
May-90                 $12,267                   $12,035
Jun-90                 $12,375                   $12,123
Jul-90                 $12,539                   $12,267
Aug-90                 $12,369                   $12,225
Sep-90                 $12,403                   $12,251
Oct-90                 $12,647                   $12,431
Nov-90                 $12,848                   $12,610
Dec-90                 $12,863                   $12,657
Jan-91                 $13,092                   $12,843
Feb-91                 $13,190                   $12,960
Mar-91                 $13,173                   $12,930
Apr-91                 $13,334                   $13,092
May-91                 $13,424                   $13,158
Jun-91                 $13,390                   $13,157
Jul-91                 $13,499                   $13,288
Aug-91                 $13,681                   $13,459
Sep-91                 $13,891                   $13,624
Oct-91                 $13,995                   $13,728
Nov-91                 $14,014                   $13,771
Dec-91                 $14,361                   $14,081
Jan-92                 $14,370                   $14,108
Feb-92                 $14,319                   $14,117
Mar-92                 $14,262                   $14,070
Apr-92                 $14,379                   $14,193
May-92                 $14,535                   $14,320
Jun-92                 $14,780                   $14,527
Jul-92                 $15,246                   $14,908
Aug-92                 $15,015                   $14,796
Sep-92                 $15,162                   $14,889
Oct-92                 $15,012                   $14,841
Nov-92                 $15,259                   $15,020
Dec-92                 $15,393                   $15,125
Jan-93                 $15,624                   $15,288
Feb-93                 $16,145                   $15,687
Mar-93                 $15,850                   $15,509
Apr-93                 $15,999                   $15,608
May-93                 $16,026                   $15,664
Jun-93                 $16,285                   $15,875
Jul-93                 $16,228                   $15,886
Aug-93                 $16,575                   $16,102
Sep-93                 $16,786                   $16,218
Oct-93                 $16,818                   $16,242
Nov-93                 $16,676                   $16,195
Dec-93                 $16,959                   $16,417
Jan-94                 $17,161                   $16,572
Feb-94                 $16,731                   $16,262
Mar-94                 $16,319                   $15,899
Apr-94                 $16,382                   $16,060
May-94                 $16,496                   $16,150
Jun-94                 $16,449                   $16,112
Jul-94                 $16,667                   $16,288
Aug-94                 $16,722                   $16,366
Sep-94                 $16,551                   $16,243
Oct-94                 $16,366                   $16,153
Nov-94                 $16,145                   $16,049
Dec-94                 $16,366                   $16,190
Jan-95                 $16,630                   $16,346
Feb-95                 $16,951                   $16,583
Mar-95                 $17,103                   $16,846
Apr-95                 $17,183                   $16,892
May-95                 $17,552                   $17,262
Jun-95                 $17,554                   $17,276
Jul-95                 $17,739                   $17,518
Aug-95                 $17,876                   $17,694
Sep-95                 $17,945                   $17,748
Oct-95                 $18,121                   $17,822
Nov-95                 $18,309                   $17,974
Dec-95                 $18,445                   $18,072
Jan-96                 $18,658                   $18,288
Feb-96                 $18,609                   $18,225
Mar-96                 $18,356                   $18,129
Apr-96                 $18,348                   $18,102
May-96                 $18,320                   $18,080
Jun-96                 $18,406                   $18,208
Jul-96                 $18,609                   $18,328
Aug-96                 $18,616                   $18,366
Sep-96                 $18,761                   $18,505
Oct-96                 $18,943                   $18,677
Nov-96                 $19,210                   $18,936
Dec-96                 $19,147                   $18,908
Jan-97                 $19,174                   $18,959
Feb-97                 $19,318                   $19,094
Mar-97                 $19,111                   $18,878
Apr-97                 $19,189                   $18,972
May-97                 $19,336                   $19,335

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction  costs and management fees) that reduce returns,  while the total
return line of the index does not.


PORTFOLIO AT A GLANCE
                           5/31/97     5/31/96
Number of Securities         51          54
Weighted Average Maturity 7.4 years   7.2 years
Average Duration          5.4 years   5.4 years
Expense Ratio               0.67%       0.70%

                 Many of the investment terms in this report are
                       defined in the Glossary on page 37.


Annual Report                                    Intermediate-Term Tax-Free   11

                           INTERMEDIATE-TERM TAX-FREE

Management Q & A

An  interview  with Joel  Silva,  a  portfolio  manager  on the  Tax-Free  funds
management team.

How did the fund perform?

The fund produced a favorable  return for the period.  For the fiscal year ended
May 31, 1997,  the fund's total return of 6.16% nearly matched the 6.23% average
return  of the  133  "Intermediate  Municipal  Debt  Funds"  tracked  by  Lipper
Analytical Services. (See the Total Returns table on the previous page for other
fund performance comparisons.)

You decreased the percentage of California municipal securities in the fund from
19% six months ago to only 9% at the end of the period. Why?

As we mentioned in the previous report, we purchased some California  municipals
at very  attractive  prices after the Orange  County  bankruptcy.  Thanks to our
strong credit staff, we also found many California  municipal securities outside
of Orange County that we felt had a strong potential to appreciate.

As California's  economy  continued to improve,  the market's  trepidation  over
buying municipals  issued by the state largely  dissipated,  causing  California
municipal securities in general to appreciate. The securities that benefited the
most from California's  improving  economy were general  obligation bonds (GOs),
which are backed by the full faith and credit of the issuer and are repaid  from
the revenues that the issuer generates.

When we felt that the  prices on some of the  fund's  California  GOs had topped
out,  we decided  to lock in gains by  selling  them.  We used the  proceeds  to
purchase  municipals  in a  few  other  states  that  we  felt  offered  similar
opportunities to add value to the fund's returns.

[bar graph - data below]

INTERMEDIATE-TERM  TAX-FREE'S  ONE-YEAR  RETURNS FOR THE PAST TEN YEARS (Periods
ended May 31)

              Intermediate-Term Tax-Free  Lehman 5-Year GO Index
5/88                     7.75%                     6.73%
5/89                     6.44%                     5.85%
5/90                     6.95%                     6.37%
5/91                     9.43%                     9.34%
5/92                     8.33%                     8.83%
5/93                    10.27%                     9.38%
5/94                     2.90%                     3.10%
5/95                     6.40%                     6.89%
5/96                     4.38%                     4.74%
5/97                     6.16%                     6.08%

This graph  illustrates  the fund's  returns over the past 10 years and compares
them with the  index's  returns.  The fund's  total  returns  include  operating
expenses, while the index's do not. See page 36 for a definition of the index.


12   Intermediate-Term Tax-Free                     American Century Investments


                           INTERMEDIATE-TERM TAX-FREE

Is that why the fund's  percentage of New York municipals rose over the last six
months?

That's  right.  Late in 1996,  New York  issued a  larger-than-normal  amount of
municipal  securities  at  very  attractive  prices.  We  added  some  of  these
securities  to the fund because we expected  New York to benefit from  generally
improving economic and credit conditions. That expectation paid off handsomely.

New York had a large  fiscal  surplus in 1996,  and although the state still has
some welfare  issues to tackle,  its economy  continued to improve.  Rather than
GOs, however, the types of undervalued securities that we looked for in New York
were COPs and lease agreements.  These types of municipals are issued to finance
public property  improvements  and equipment  purchases and usually offer higher
yields  than GOs.  As  awareness  of these  attractively  priced  COPs and lease
agreements increased, their values rose.

Why did you increase the fund's holdings of revenue bonds?

Primarily to take advantage of the relatively  range-bound nature of the market.
During such periods,  interest  payments  generally  contribute more to a fund's
returns  than  price  appreciation.  We  bought  revenue  bonds,  COPs and lease
agreements because they tend to offer relatively high yields.

Have you changed the fund's positioning in the past six months?

Yes. The main adjustments we made were to the fund's  structure.  By early 1997,
we had shifted the fund toward more of a barbell.  (A barbell overweights a fund
in  short-  and  long-term   securities   and   underweights   intermediate-term
maturities.) That helped the fund's returns as concerns that the Federal Reserve
would raise rates caused the yield curve to flatten.

However,  we recently shifted the fund to more of a bullet. (A bullet clusters a
fund's bond maturities around a single, usually intermediate-term,  maturity.) A
bullet tends to perform best when the yield curve is moving from flat to steep.

We  made  only  slight   adjustments   to  the  fund's   duration,   keeping  it
conservatively  positioned  within  a narrow  range  around  5.4  years--roughly
neutral to the fund's peers.

TOP FIVE STATES (% of fund investments)
                 As of                      As of
                 5/31/97                  11/30/96
Washington         17%      California       19%
Texas              16%      Texas            17%
California          9%      Washington       12%
New York            9%      Illinois          6%
Florida             6%      Oklahoma          5%

[pie charts]

PORTFOLIO  COMPOSITION BY SECURITY TYPE (as of 5/31/97) 
Revenue Bonds 60% 
GO 22%
COPs/Leases 11% 
Prerefunded/ETM 7%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 11/30/96) 
Revenue Bonds 43% 
GO 19%
COPs/Leases 12% 
Other 26%


Annual Report                                    Intermediate-Term Tax-Free   13


                           INTERMEDIATE-TERM TAX-FREE

How will the proposed merger with the Benham  Intermediate-Term  Tax-Exempt fund
affect this fund?

Shareholders will see no change to the fund's management. The new, combined fund
will  have all of this  fund's  investment  objectives  and  policies,  so we'll
continue to manage the new fund in the same way we've managed this one. The only
significant  difference is that the new fund will carry the performance  history
of the Intermediate-Term Tax-Exempt fund.

What is your outlook for interest rates over the next six months?

Currently,  the market seems to be expecting  economic growth to slow,  allowing
the Fed to hold short-term rates steady. However, we disagree somewhat with that
notion.  Consumer  confidence  remains at a 28-year high, and the  manufacturing
sector continues to show surprising strength.  With labor markets already tight,
that combination may cause inflation to appear on the horizon.

On the other hand,  the federal funds  rate--the  rate at which Federal  Reserve
member  banks  borrow  money  from each  other to meet  overnight  cash  reserve
requirements--is  already at a historically  restrictive  level. That means that
economic growth going forward will likely stay fairly well  contained.  As such,
we  believe  that the Fed should not need to raise  rates  dramatically  to keep
inflation within manageable levels.

What is your outlook for the municipal market?

If U.S. economic growth continues to slow, municipal securities could rally; but
any signs of an  overheating  economy  will  likely push  municipal  bond prices
lower.

Another  important factor is the relative  performance of municipal and Treasury
securities.  For  the  first  five  months  of  1997,  municipals  significantly
outperformed  Treasurys,  a situation caused in part by relatively low municipal
issuance.

Although  municipal issuance should remain fairly light for the near future, the
likelihood  that  municipal  bonds will  continue  to  outperform  Treasurys  is
diminishing--municipal   prices  have   reached   levels  that  are   considered
historically  expensive  compared with  like-maturity  Treasurys.  If municipals
continue this trend much longer,  investor demand could eventually shift back to
Treasurys, removing a key support for municipal bond prices.

With this outlook in mind, what are your plans for the fund going forward?

We plan to maintain the fund's current neutral  position,  which we believe will
allow us to respond  appropriately if the economic outlook changes dramatically.
In addition,  we will continue to monitor the  performance  of municipal  versus
Treasury  securities.  With the help of our credit research team, we'll look for
securities that we believe will enhance the fund's returns.

[pie charts]

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/97)
AAA 65%
AA 15%
A 15%
BBB 5%

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 11/30/96)
AAA 68%
AA 18%
A 13%
BBB 1%


14   Intermediate-Term Tax-Free                     American Century Investments


                            SCHEDULE OF INVESTMENTS
                           INTERMEDIATE-TERM TAX-FREE

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

MUNICIPAL SECURITIES
ALABAMA-1.7%
$ 1,000,000   Alabama Municipal Electric Power
                Auth. Rev., 6.10%, 9/1/99 (MBIA)                 $1,038,980
                                                                 ----------
ALASKA-0.9%
    500,000   Anchorage Hospital Rev., Series
                1991, (Sisters of Providence),
                6.50%, 10/1/99                                      520,440
                                                                 ----------
CALIFORNIA-9.3%
  2,170,000   California Housing Finance Agency
                Rev., 5.60%, 8/1/09 (MBIA)                        2,219,020
  1,100,000   California Public Works Board Rev.
                Certificates of Participation,
                (Various Universities), 6.15%,
                11/1/09                                           1,176,989
  1,100,000   Sacramento Regional Transportation
                Certificates of Participation, Series
                A, 6.20%, 3/1/00                                  1,147,443
  1,000,000   State of California GO, 5.75%,
                10/1/10                                           1,059,770
                                                                 ----------
                                                                  5,603,222
                                                                 ----------
FLORIDA-6.1%
    700,000   Broward County School District
                GO, 6.75%, 2/15/00                                  740,439
  1,000,000   Dade County Rev., (Seaport),
                6.25%, 10/1/06 (MBIA)                             1,104,440
  1,000,000   Dade County Water and Sewer
                System Rev., 5.125%, 10/1/09
                (FGIC)                                            1,000,840
    775,000   Lakeland Electric and Water Rev.,
                Series B, 6.00%, 10/1/09 (FGIC)                     839,333
                                                                 ----------
                                                                  3,685,052
                                                                 ----------
GEORGIA-4.6%
  2,495,000   Fulton County Water and Sewer
                Rev., 6.25%, 1/1/09 (FGIC)                        2,746,995
                                                                 ----------
HAWAII-1.8%
  1,000,000   Hawaii GO, Series A, 7.00%,
                6/1/00 (FGIC)(1)                                  1,071,080
                                                                 ----------

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

ILLINOIS-5.2%
$ 2,000,000   City of Chicago GO, (Emergency
                Telephone), 5.25%, 1/1/04
                (FGIC)                                           $2,041,720
  1,000,000   Illinois Education Facility Auth. Rev.,
                Series A, (Loyola University),
                6.30%, 7/1/98                                     1,025,020
     30,000   Metropolitan Pier and Exposition
                Auth. Rev., (McCormick Place
                Project), 5.20%, 6/15/99(1)                          30,568
                                                                 ----------
                                                                  3,097,308
                                                                 ----------
INDIANA-1.6%
  1,000,000   South Montgomery Industrial
                Building Improvement Certificates
                of Participation, 3.94%, 1/1/98
                (AMBAC)(2)                                          977,390
                                                                 ----------
MASSACHUSETTS-1.7%
  1,000,000   Massachusetts GO, Series A,
                5.40%, 11/1/06                                    1,032,370
                                                                 ----------
MICHIGAN-2.5%
  1,500,000   Detroit Water Supply System Rev.,
                Series A, 5.30%, 7/1/09 (MBIA)                    1,524,450
                                                                 ----------
NEW JERSEY-1.8%
  1,000,000   New Jersey Transportation Trust
                Fund Auth. Rev., Series A, 6.00%,
                12/15/05 (MBIA)                                   1,080,710
                                                                 ----------
NEW YORK-8.7%
  1,000,000   New York State Dormitory Auth.
                Rev. Certificates of Participation,
                Series A, (Mental Health Service
                Facility), 5.30%, 2/15/04                         1,004,960
  1,000,000   New York State Dormitory Auth.
                Rev., Series E, (Mental Health
                Service Facility), 6.00%,
                8/15/04 (AMBAC)                                   1,067,920
  1,000,000   New York State Thruway Auth.
                Rev., Series A, (Highway &
                Bridge Trust Fund), 6.00%,
                4/1/07 (AMBAC)                                    1,079,700
  1,000,000   New York State Thruway Auth.
                Service Contract Rev. Certificates
                of Participation, 5.30%, 4/1/04                   1,005,050

See Notes to Financial Statements


Annual Report                                    Intermediate-Term Tax-Free   15


                            SCHEDULE OF INVESTMENTS
                           INTERMEDIATE-TERM TAX-FREE

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 1,000,000   New York State Urban
                Development Corp. Rev.
                Certificates of Participation,
                6.25%, 4/1/05 (MBIA)                             $1,085,880
                                                                 ----------
                                                                  5,243,510
                                                                 ----------
NORTH CAROLINA-3.6%
  2,000,000   North Carolina Eastern Municipal
                Power Agency Rev., Series 1993,
                6.00%, 1/1/06 (FSA)                               2,136,700
                                                                 ----------
OHIO-1.8%
  1,000,000   Ohio State Building Auth. Rev.
                Certificates of Participation,
                Series A, (Correctional Facility),
                6.25%, 10/1/00                                    1,053,890
                                                                 ----------
OKLAHOMA-4.7%
  2,500,000   Oklahoma Industrial Auth. Health
                System Rev., Series 1995 C,
                7.00%, 8/15/04 (AMBAC)                            2,827,500
                                                                 ----------
PENNSYLVANIA-3.1%
  1,000,000   Philadelphia Parking Auth. Rev.,
                5.50%, 9/1/04 (AMBAC)                             1,037,720
    845,000   Philadelphia Water and Wastewater
                Rev., 5.00%, 6/15/12 (FGIC)                         802,125
                                                                 ----------
                                                                  1,839,845
                                                                 ----------
TEXAS-15.8%
    115,000   Austin County GO, Series C,
                6.75%, 9/1/00, Prerefunded
                at Par(1)                                           122,864
    885,000   Austin County GO, Series C, 6.75%,
                9/1/01                                              946,207
  1,000,000   Denison Hospital Auth. Rev.,
                (Texoma Medical Center), 5.90%,
                8/15/07                                           1,011,360
  1,500,000   Harris County Health Facility
                Memorial Hospital Rev., (Systems
                Project), 6.80%, 6/1/01(1)                        1,621,380
    500,000   North Texas Higher Education
                Student Loan Rev., 6.875%,
                4/1/02 (AMBAC)                                      527,635
  1,000,000   State of Texas GO, Series 1995,
                6.50%, 10/1/03                                    1,096,710

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 2,000,000   Texas Municipal Power Agency Rev.,
                5.75%, 9/1/02 (MBIA)                           $  2,101,800
  1,000,000   Texas Municipal Power Agency Rev.,
                5.25%, 9/1/09 (MBIA)                              1,012,100
  1,000,000   Texas Turnpike Auth. Rev., Series
                1990 A, 7.00%, 1/1/99,
                Prerefunded at 102% of Par
                (AMBAC)(1)                                        1,061,130
                                                                 ----------
                                                                  9,501,186
                                                                 ----------
UTAH-4.2%
  1,465,000   Utah Housing Finance Agency
                Single Family Mortgage Rev.,
                5.65%, 7/1/06                                     1,493,582
  1,000,000   Utah State MFC University Rev.,
                Series 1991, (Utah Hospital),
                6.60%, 5/15/00                                    1,054,840
                                                                 ----------
                                                                  2,548,422
                                                                 ----------
WASHINGTON-17.3%
  1,000,000   Pierce County School District No.
                3 GO, Series B, 5.80%, 12/1/99                    1,033,320
  1,000,000   Pierce County School District No.
                320 GO, 5.75%, 12/1/02                            1,044,430
  1,435,000   Port Seattle Rev., Series B, 5.10%,
                10/1/03 (FGIC)                                    1,444,155
  2,000,000   Snohomish County Public Utility
                District Rev., Series 1993,
                5.625%, 1/1/05 (FGIC)                             2,083,140
  1,000,000   Snohomish County School District
                No. 15 GO, 6.125%, 12/1/03                        1,051,020
  1,000,000   Spokane County School District No.
                356 GO, 6.00%, 12/1/06 (FGIC)                     1,074,130
  1,000,000   Washington Public Power Supply
                System Rev., (Project No. 1),
                7.10%, 7/1/01 (FGIC)                              1,084,810
  1,000,000   Washington Public Power Supply
                System Rev., (Project No. 1),
                5.50%, 7/1/04                                     1,025,280
    500,000   Washington Public Power Supply
                System Rev., Series C, 7.00%,
                7/1/01 (FGIC)                                       541,890
                                                                 ----------
                                                                 10,382,175
                                                                 ----------

See Notes to Financial Statements


16   Intermediate-Term Tax-Free                     American Century Investments


                            SCHEDULE OF INVESTMENTS
                           INTERMEDIATE-TERM TAX-FREE

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

WISCONSIN-3.6%
$ 1,000,000   Wisconsin State Health and
                Educational Facility Rev., (Aurora
                Medical Group), 6.00%,
                11/15/00 (FSA)                                $   1,072,210
  1,060,000   Wisconsin State Health and
                Educational Facility Rev., Series B,
                (Wausau Hospital), 6.30%,
                8/15/00 (AMBAC)                                   1,113,997
                                                                 ----------
                                                                  2,186,207
                                                                 ----------
TOTAL INVESTMENT SECURITIES-100.0%                              $60,097,432
   (Cost $58,207,224)                                           ===========


Notes to Schedule of Investments 
AMBAC = AMBAC Indemnity Corp.
FGIC = Financial Guaranty Insurance Company
FSA = Financial Security Association
GO = General Obligation
MBIA = Municipal Bond Insurance Association
(1) Escrowed in U.S. Government Securities.
(2)Security  is a zero-coupon  municipal  bond. The yield to maturity at May 31,
1997,  is  indicated.  Zero-coupon  securities  are  purchased at a  substantial
discount from their value at maturity.

See Notes to Financial Statements


Annual Report                                    Intermediate-Term Tax-Free   17

<TABLE>
<CAPTION>
                                                    LONG-TERM TAX-FREE

                                             30-Day                  30-Day Tax-Equivalent Yields
                                               SEC           28%           31%           36%           39.6%
                                              Yield      Tax Bracket   Tax Bracket   Tax Bracket    Tax Bracket

CURRENT YIELDS AS OF MAY 31, 1997
<S>                                           <C>           <C>           <C>           <C>            <C>  
Long-Term Tax-Free                            4.85%         6.74%         7.03%         7.58%          8.03%

                                                                        AVERAGE ANNUAL RETURNS
                                            6 MONTHS       1 YEAR        3 YEARS       5 YEARS       10 YEARS
TOTAL RETURNS AS OF MAY 31, 1997
Long-Term Tax-Free .......................    1.76%         8.41%         6.80%         7.26%          7.85%
Lehman Long-Term Municipal Bond Index ....    1.65%        10.04%         8.47%         8.05%          9.40%
Average General Municipal
Debt Fund(1) .............................    1.36%         7.60%         6.46%         6.65%          7.87%
Fund's Ranking Among General
Municipal Debt Funds(1) ..................     --       47 out of 226 61 out of 174 15 out of 106  35 out of 67

(1) According to Lipper Analytical Services.
</TABLE>

See pages 36-37 for more information  about returns,  the comparative  index and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER TEN YEARS
Value on 5/31/97

Long-Term Tax-Free         $21,296
Lehman Long-Term Municipal Index    $24,564

                  Long-Term Tax-Free Lehman Long-Term Municipal Index
May-87                 $10,000                   $10,000
Jun-87                 $10,179                   $10,319
Jul-87                 $10,270                   $10,414
Aug-87                 $10,267                   $10,460
Sep-87                  $9,738                   $10,033
Oct-87                  $9,641                   $10,033
Nov-87                  $9,870                   $10,353
Dec-87                 $10,028                   $10,488
Jan-88                 $10,473                   $10,907
Feb-88                 $10,585                   $11,035
Mar-88                 $10,368                   $10,877
Apr-88                 $10,445                   $10,963
May-88                 $10,432                   $10,974
Jun-88                 $10,601                   $11,188
Jul-88                 $10,672                   $11,263
Aug-88                 $10,702                   $11,308
Sep-88                 $10,876                   $11,564
Oct-88                 $11,094                   $11,827
Nov-88                 $10,986                   $11,700
Dec-88                 $11,154                   $11,904
Jan-89                 $11,348                   $12,184
Feb-89                 $11,222                   $12,013
Mar-89                 $11,218                   $12,023
Apr-89                 $11,479                   $12,376
May-89                 $11,743                   $12,662
Jun-89                 $11,892                   $12,855
Jul-89                 $12,066                   $13,025
Aug-89                 $11,877                   $12,827
Sep-89                 $11,742                   $12,788
Oct-89                 $11,896                   $12,957
Nov-89                 $12,146                   $13,232
Dec-89                 $12,228                   $13,330
Jan-90                 $12,078                   $13,195
Feb-90                 $12,227                   $13,344
Mar-90                 $12,214                   $13,358
Apr-90                 $11,980                   $13,195
May-90                 $12,424                   $13,567
Jun-90                 $12,524                   $13,701
Jul-90                 $12,802                   $13,942
Aug-90                 $12,389                   $13,611
Sep-90                 $12,360                   $13,589
Oct-90                 $12,670                   $13,877
Nov-90                 $12,962                   $14,229
Dec-90                 $13,043                   $14,292
Jan-91                 $13,235                   $14,483
Feb-91                 $13,251                   $14,585
Mar-91                 $13,269                   $14,620
Apr-91                 $13,467                   $14,846
May-91                 $13,601                   $15,021
Jun-91                 $13,519                   $14,993
Jul-91                 $13,707                   $15,225
Aug-91                 $13,888                   $15,444
Sep-91                 $14,126                   $15,667
Oct-91                 $14,285                   $15,831
Nov-91                 $14,277                   $15,851
Dec-91                 $14,728                   $16,228
Jan-92                 $14,657                   $16,218
Feb-92                 $14,684                   $16,244
Mar-92                 $14,629                   $16,285
Apr-92                 $14,765                   $16,440
May-92                 $15,018                   $16,681
Jun-92                 $15,346                   $17,003
Jul-92                 $16,007                   $17,627
Aug-92                 $15,691                   $17,390
Sep-92                 $15,719                   $17,467
Oct-92                 $15,386                   $17,176
Nov-92                 $15,839                   $17,659
Dec-92                 $16,084                   $17,888
Jan-93                 $16,281                   $18,057
Feb-93                 $17,141                   $18,897
Mar-93                 $16,810                   $18,669
Apr-93                 $17,114                   $18,925
May-93                 $17,212                   $19,081
Jun-93                 $17,526                   $19,440
Jul-93                 $17,457                   $19,459
Aug-93                 $17,973                   $19,957
Sep-93                 $18,239                   $20,217
Oct-93                 $18,224                   $20,255
Nov-93                 $17,997                   $20,010
Dec-93                 $18,377                   $20,526
Jan-94                 $18,591                   $20,769
Feb-94                 $18,022                   $20,081
Mar-94                 $17,259                   $18,882
Apr-94                 $17,273                   $19,028
May-94                 $17,478                   $19,250
Jun-94                 $17,368                   $19,019
Jul-94                 $17,742                   $19,508
Aug-94                 $17,732                   $19,549
Sep-94                 $17,464                   $19,096
Oct-94                 $17,120                   $18,509
Nov-94                 $16,854                   $18,021
Dec-94                 $17,247                   $18,660
Jan-95                 $17,723                   $19,482
Feb-95                 $18,206                   $20,274
Mar-95                 $18,358                   $20,518
Apr-95                 $18,341                   $20,507
May-95                 $18,927                   $21,381
Jun-95                 $18,696                   $20,988
Jul-95                 $18,834                   $21,095
Aug-95                 $19,021                   $21,392
Sep-95                 $19,169                   $21,559
Oct-95                 $19,543                   $22,081
Nov-95                 $19,998                   $22,650
Dec-95                 $20,299                   $23,004
Jan-96                 $20,342                   $23,103
Feb-96                 $20,150                   $22,821
Mar-96                 $19,734                   $22,403
Apr-96                 $19,618                   $22,314
May-96                 $19,637                   $22,325
Jun-96                 $19,855                   $22,669
Jul-96                 $20,036                   $22,894
Aug-96                 $20,054                   $22,864
Sep-96                 $20,371                   $23,372
Oct-96                 $20,585                   $23,658
Nov-96                 $20,920                   $24,166
Dec-96                 $20,761                   $24,021
Jan-97                 $20,817                   $23,973
Feb-97                 $21,027                   $24,232
Mar-97                 $20,758                   $23,813
Apr-97                 $20,976                   $24,094
May-97                 $21,296                   $24,564

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction  costs and management fees) that reduce returns,  while the total
return line of the index does not.

PORTFOLIO AT A GLANCE
                             5/31/97     5/31/96
Number of Securities           42          36
Weighted Average Maturity  17.4 years  17.3 years
Average Duration            7.8 years   8.0 years
Expense Ratio                 0.67%       0.70%

                 Many of the investment terms in this report are
                       defined in the Glossary on page 37.


18   Long-Term Tax-Free                             American Century Investments


                               LONG-TERM TAX-FREE

Management Q & A

An interview with Dave MacEwen, a senior portfolio manager on the Tax-Free funds
management team.

How did the fund perform?

The fund  performed  very well relative to its peers.  For the fiscal year ended
May 31, 1997, the fund returned 8.41%, compared with the 7.60% average return of
the 226 "General  Municipal Debt Funds" tracked by Lipper  Analytical  Services.
The fund's longer-term  returns are also quite strong.  For example,  the fund's
five-year  return  places  it in the top 15% of its peer  group.  (See the Total
Returns  table on the  previous  page for other fund  performance  comparisons.)
Security selection and our conservative,  team-oriented management approach were
responsible for the fund's strong performance.

How was the fund positioned during the period?

We made minor  adjustments to its  positioning  during the period in response to
changing market conditions.  The fund's average maturity as of May 31, 1997, was
17.4  years,  little  changed  from 17.3 years at the  beginning  of the period.
However,  its duration was slightly lower at period-end  because we took profits
by  selling  some  long-term  securities  in late May.  We  extended  the fund's
duration back out by the first week of June in  anticipation  of slower economic
growth--a move that benefited the fund as the market  rallied  throughout  early
June.

The fund can now hold  securities  rated  BBB.  What  impact has this had on the
fund's performance?

Our ability to buy the entire spectrum of investment-grade securities helped the
fund's performance

[bar graph - data below]

LONG-TERM  TAX-FREE'S ONE-YEAR RETURNS FOR THE PAST TEN YEARS (Periods ended May
31)

              Long-Term Tax-Free   Lehman Long-Term Municipal Bond Index
5/88                 4.37%                         9.75%
5/89                12.57%                        15.38%
5/90                 5.80%                         7.15%
5/91                 9.48%                        10.71%
5/92                10.47%                        11.05%
5/93                14.64%                        14.39%
5/94                 1.53%                         0.89%
5/95                 8.29%                        11.07%
5/96                 3.75%                         4.41%
5/97                 8.41%                        10.04%

This graph  illustrates  the fund's  returns over the past 10 years and compares
them with the  index's  returns.  The fund's  total  returns  include  operating
expenses, while the index's do not. See page 36 for a definition of the index.


Annual Report                                            Long-Term Tax-Free   19


                               LONG-TERM TAX-FREE

and allowed us to make better use of our municipal credit research team. We made
several purchases of attractively valued BBB-rated securities during the period.
We sold  many of them at a profit  as credit  spreads--the  difference  in yield
between securities with different credit ratings--declined.

While  narrowing  credit  spreads  made it  difficult  to find good values among
lower-rated  municipal  securities,  the New York municipal market still offered
some  opportunities.  Though New York still has some  welfare  issues to contend
with,  the  state's  improving  economy  helped  make its  municipal  securities
particularly attractive. These undervalued, lower-rated bonds boosted the fund's
yield and return as spreads contracted.

Why are credit spreads narrowing?

Primarily  because of the strong growth of the economy.  Strong  economic growth
has boosted  local tax  revenues and improved  municipal  budgets.  As a result,
municipal  credit  quality  improved  throughout  the period (see page 4). Heavy
demand for lower-rated,  higher-yielding  municipals also contributed to tighter
spreads--with  the bond  market  trading  in a range,  investors  are  trying to
enhance  performance by grabbing  yield.  These factors  combined to send credit
spreads to historic lows.

You are also able to invest up to 20% of the fund's  assets in AMT  paper.  Have
you taken advantage of this new investment policy?

Yes.  AMT paper  generally  offers  relatively  high yields,  but tighter  yield
spreads made it more difficult to find attractive values in this sector. We used
the opportunity to sell some of our AMT holdings at a profit.

You held some Treasury put options at the end of the period. Why?

We bought  Treasury  put  options as a form of  insurance  against a bond market
decline.  (A  put  option  allows  the  bondholder  to  sell  a  security  at  a
pre-determined  price on a specified  date.) Hedging the fund with Treasury puts
allowed us to hold more long-term  municipal  securities than we otherwise would
have felt comfortable  with. That helped the fund during the period as long-term
municipal bonds performed well.

TOP FIVE STATES (% of fund investments)
                 As of                      As of
                 5/31/97                  11/30/96
Illinois           19%      Illinois         16%
Massachussetts     10%      Washington        9%
California          9%      California        9%
Florida             9%      Texas             8%
Washington          8%      Florida           8%

[pie charts]

PORTFOLIO  COMPOSITION  BY  SECURITY  TYPE (as of  5/31/97)  
Revenue  Bonds  68%
Prerefunded/ETM 15% 
Land-Secured 6% 
COPs/Leases 5% 
GO 2% 
Other 4%

PORTFOLIO  COMPOSITION  BY  SECURITY  TYPE (as of  11/30/96)  
Revenue  Bonds 51%
COPs/Leases 14% 
Prerefunded/ETM 10% 
Other 25%


20   Long-Term Tax-Free                             American Century Investments

                               LONG-TERM TAX-FREE

How will the proposed  merger with the Benham  Long-Term  Tax-Exempt fund affect
this fund?

Shareholders will see no change to the fund's management. The new, combined fund
will  have all of this  fund's  investment  objectives  and  policies,  so we'll
continue to manage the new fund in the same way we've managed this one. The only
significant  difference is that the new fund will carry the performance  history
of the Long-Term Tax-Exempt fund.

What is your outlook for the municipal market over the next six months?

Whether the bond market can sustain the rally begun in early June depends on the
economy,  Federal  Reserve  interest  rate  policy and  inflation.  Our  current
expectation   is  that  economic   growth  will  slow  from  its   unsustainable
first-quarter  pace.  Inflation seems tame, having risen just 2.2% over the last
12 months. In addition,  "real"  short-term  interest rates (the nominal federal
funds rate minus the inflation  rate) are already at levels that should  inhibit
economic growth. As a result,  we think municipal  securities could rally if the
economy continues to slow.  Nevertheless,  if wage pressures increase, fear of a
Fed rate hike may send municipal bond prices lower.

Another  important  factor  is  the  relative   performance  of  municipals  and
Treasurys.   Lately,   municipal  securities  have  significantly   outperformed
Treasurys, a situation caused in part by relatively low municipal debt issuance.
Although  municipal  issuance should remain fairly light in the near future, the
likelihood  that  municipal  bonds will  continue  to  outperform  Treasurys  is
diminishing--their   prices  are  currently  considered  historically  expensive
relative to Treasurys.  If investor  demand shifts back to Treasurys,  municipal
prices would lose a key support.

With this outlook in mind, what are your plans for the fund going forward?

We'll  likely  keep the  fund's  duration  slightly  longer  than its peer group
average.  That would help the fund's  performance  if the economy  continues  to
slow. We think it's possible that slower  economic growth and high real interest
rates  could cause the market to begin to rally.  We will also  continue to work
with our credit research team to look for attractively valued securities.

[pie charts]

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/97)
AAA 48%
AA 43%
A 6%
BBB 3%

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 11/30/96)
AAA 51%
AA 39%
A 7%
BBB 3%


Annual Report                                            Long-Term Tax-Free   21


                            SCHEDULE OF INVESTMENTS
                               LONG-TERM TAX-FREE

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

MUNICIPAL SECURITIES
ALABAMA-3.3%
$ 2,000,000   Alabama Special Care Facility
                Financing Auth. Rev., (Daughters
                of Charity), 5.00%, 11/1/25                      $1,800,140
                                                                 ----------
CALIFORNIA-7.2%
  1,000,000   Anaheim Public Financing Auth.
                Lease Rev. Certificates of
                Participation, Series C, (Public
                Improvement Projects), 6.00%,
                9/1/16 (FSA)                                      1,071,800
  1,500,000   Los Angeles County Metropolitan
                Transportation Auth. Sales Tax
                Rev., Series A, 5.25%, 7/1/27
                (MBIA)                                            1,429,200
  1,700,000   Los Angeles Wastewater Rev.,
                Series 1993 D, 4.70%, 11/1/19
                (FGIC)                                            1,469,854
                                                                 ----------
                                                                  3,970,854
                                                                 ----------
FLORIDA-5.8%
    855,000   Broward County Resource Recovery
                Facility Rev., Series 1984, (South
                Project), 7.95%, 12/1/08                            931,753
  1,000,000   Orlando Water and Electric Auth.
                Rev., Series D, 6.75%, 10/1/17                    1,167,350
  1,000,000   St. Petersburg Health Auth. Rev.,
                (Allegheny Health), 7.00%,
                12/1/15 (MBIA)                                    1,092,160
                                                                 ----------
                                                                  3,191,263
                                                                 ----------
GEORGIA-2.0%
  1,000,000   Georgia Municipal Electric Auth.
                Rev., 6.50%, 1/1/12 (MBIA)                        1,119,160
                                                                 ----------
ILLINOIS-17.3%
  1,965,000   Chicago Metropolitan Water
                Reclamation District Capital
                Improvement GO, 6.25%,
                12/1/14                                           2,094,906
  1,500,000   Illinois Dedicated Tax Rev., (Civic
                Center Project), 6.25%,
                12/15/20 (AMBAC)                                  1,631,790

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 1,500,000   Illinois Development Finance Auth.
                Pollution Control Rev., Series B,
                (Central Illinois Public Service),
                7.60%, 3/1/14                                    $1,620,195
    700,000   Illinois Health Facilities Auth. Rev.,
                Series C, (Evangelical Hospital),
                6.75%, 4/15/02, Prerefunded
                at 102% of Par(1)                                   773,794
  1,140,000   Illinois Health Facilities Auth. Rev.,
                Series C, (Evangelical Hospital),
                6.75%, 4/15/12(1)                                 1,261,547
  2,000,000   Springfield Water Rev., 6.50%,
                3/1/15                                            2,087,100
                                                                 ----------
                                                                  9,469,332
                                                                 ----------
INDIANA-4.2%
  1,000,000   Indiana Municipal Power Agency
                Rev., Series A, 7.10%, 1/1/00,
                Prerefunded at 102% of Par
                (AMBAC)(1)                                        1,082,750
  1,000,000   Indiana Transportation Financing
                Auth. Highway Rev., Series A,
                7.25%, 6/1/15                                     1,197,740
                                                                 ----------
                                                                  2,280,490
                                                                 ----------
MASSACHUSETTS-10.0%
  1,500,000   Massachusetts Bay Transportation
                Auth. Rev., Series A, 5.50%,
                3/1/22 (MBIA)                                     1,451,625
  1,000,000   Massachusetts Health and
                Education Auth. Rev., Series F,
                6.25%, 7/1/12 (AMBAC)                             1,091,770
  1,690,000   Massachusetts Housing Finance
                Agency Rev., Series 1992 H,
                6.75%, 11/15/12 (FNMA)                            1,790,285
  1,115,000   Massachusetts Housing Finance
                Agency Rev., Series 1993 A,
                6.375%, 4/1/21                                    1,151,973
                                                                 ----------
                                                                  5,485,653
                                                                 ----------

See Notes to Financial Statements


22   Long-Term Tax-Free                             American Century Investments


                            SCHEDULE OF INVESTMENTS
                               LONG-TERM TAX-FREE

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

NEW YORK-5.5%
$ 2,000,000   New York State Urban
                Development Corporation Rev.
                Certificates of Participation,
                (Correctional Facilities), Series 4,
                5.375%, 1/1/23                                   $1,836,240
  1,250,000   Port Authority New York and New
                Jersey Rev., 5.20%, 7/15/21
                (AMBAC)                                           1,189,738
                                                                 ----------
                                                                  3,025,978
                                                                 ----------
PENNSYLVANIA-3.3%
  2,000,000   Pennsylvania Intergovernmental
                Special Tax Rev., 5.00%,
                6/15/22 (MBIA)                                    1,805,840
                                                                 ----------
RHODE ISLAND-4.2%
  1,100,000   Rhode Island Clean Water Agency
                Rev., 6.70%, 1/1/15 (AMBAC)                       1,205,919
  1,000,000   Rhode Island Depositors Economic
                Special Obligation, 6.25%,
                8/1/16 (MBIA)                                     1,084,960
                                                                 ----------
                                                                  2,290,879
                                                                 ----------
SOUTH CAROLINA-5.2%
  1,500,000   Piedmont Municipal Power Agency
                Electric Rev., 6.75%, 1/1/19
                (FGIC)                                            1,734,090
    860,000   Piedmont Municipal Power Agency
                Electric Rev., Series 1991 A,
                6.50%, 1/1/16 (FGIC)                                966,262
    140,000   Piedmont Municipal Power Agency
                Electric Rev., Series 1991 A,
                6.50%, 1/1/16 (FGIC)(1)                             156,422
                                                                 ----------
                                                                  2,856,774
                                                                 ----------
TEXAS-5.0%
    600,000   Lower Colorado River Auth. Rev.,
                5.25%, 1/1/15(1)                                    591,504
  2,000,000   San Antonio Electric and Gas
                System Rev., 5.46%, 2/1/09
                (FGIC)(2)                                         1,066,660
  1,000,000   Tarrant County Health Facility Rev.,
                6.00%, 5/15/11 (MBIA)                             1,067,900
                                                                 ----------
                                                                  2,726,064
                                                                 ----------

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

UTAH-2.3%
$ 1,000,000   Salt Lake City Hospital Rev.,
                Series A, (Intermountain Health
                Corporation), 8.125%, 5/15/15(1)               $  1,236,310
                                                                 ----------
VIRGINIA-5.3%
  1,000,000   Hampton Industrial Development
                Auth. Rev., Series A, (Sentara
                General Hospital), 6.50%,
                11/1/12                                           1,067,770
  1,750,000   Virginia State Housing Development
                Auth. Rev., Series F, (Single
                Family Mortgage), 7.10%,
                1/1/17                                            1,823,045
                                                                 ----------
                                                                  2,890,815
                                                                 ----------
WASHINGTON-8.1%
  1,405,000   Port of Seattle Rev., 7.50%,
                12/1/00, Prefunded at 102%
                of Par (AMBAC)(1)                                 1,565,451
  1,625,000   Seattle Metropolitan Sewer Rev.,
                Series T, 6.875%, 1/1/00,
                Prerefunded at 102% of Par(1)                     1,749,394
  1,000,000   Washington State GO, Series A,
                6.75%, 2/1/15                                     1,150,520
                                                                 ----------
                                                                  4,465,365
                                                                 ----------
WISCONSIN-4.0%
  1,900,000    Wisconsin State Clean Water Rev.,
                6.875%, 6/1/11                                    2,194,215
                                                                 ----------
TOTAL MUNICIPAL SECURITIES-92.7%                                 50,809,132
                                                                 ----------
   (Cost $47,863,309)

PURCHASED PUT OPTIONS
Contracts
         45   U.S. Treasury Bond Futures-
                September 1997 Contract Strike
                @ 106 Expires 8/23/97                                24,610
                                                                 ----------
   (Cost $37,716)

See Notes to Financial Statements


Annual Report                                            Long-Term Tax-Free   23


                            SCHEDULE OF INVESTMENTS
                               LONG-TERM TAX-FREE

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

SHORT-TERM MUNICIPAL SECURITIES
ARIZONA-0.4%
$   200,000   Phoenix Industrial Development
                Auth. Multifamily Housing Rev.,
                (Del Mar Terrace Apartment
                Project), VRDN, 3.90%, 6/5/97
                (LOC: Bank of America)                          $   200,000
                                                                 ----------
CALIFORNIA-1.8%
  1,000,000   Richmond Joint Powers Financing
                Auth. Lease Rev., VRDN, 4.00%,
                6/2/97 (LOC: Union Bank of
                California)                                       1,000,000
                                                                 ----------
FLORIDA-3.3%
  1,800,000   University Athletic Association
                Capital Improvement Rev.,
                (University of Florida Stadium
                Project), VRDN, 3.90%, 6/2/97
                (LOC: Suntrust Bank Central
                Florida, N.A.)                                    1,800,000
                                                                 ----------
ILLINOIS-1.8%
  1,000,000   Chicago O'Hare International
                Airport Rev., VRDN, 4.05%,
                6/2/97 (LOC: Royal Bank of
                Canada                                            1,000,000
                                                                 ----------
TOTAL SHORT-TERM
MUNICIPAL SECURITIES-7.3%                                         4,000,000
                                                                 ----------
   (Cost $4,000,000)
TOTAL INVESTMENT SECURITIES-100.0%                              $54,833,742
                                                                ===========
   (Cost $51,901,025)

Notes to Schedule of Investments 
AMBAC = AMBAC Indemnity Corp.
FGIC = Financial Guaranty Insurance Company 
FNMA = Federal National Mortgage Association 
FSA = Financial Security Association 
GO = General Obligation 
LOC = Letter of Credit 
MBIA = Municipal Bond Insurance Association
VRDN = Variable Rate Demand Note. Interest reset date is indicated and used in
calculating the weighted average portfolio maturity. Rate shown is effective
May 31, 1997.
(1)Escrowed in U.S. Government Securities.
(2)Security is a zero-coupon municipal bond. The yield to maturity at May 31, 
1997, is indicated. Zero-coupon securities are purchased at a substantial 
discount from their value at maturity.

See Notes to Financial Statements


24   Long-Term Tax-Free                             American Century Investments

<TABLE>
<CAPTION>
                      STATEMENTS OF ASSETS AND LIABILITIES

MAY 31, 1997

                                                                     TAX-FREE     INTERMEDIATE-TERM     LONG-TERM
                                                                   MONEY MARKET       TAX-FREE          TAX-FREE

ASSETS
Investment securities, at value (amortized cost for
  Tax-Free Money Market; identified cost of $58,207,224
<S>   <C>                              <C>                        <C>              <C>              <C>        
  and $51,901,025, respectively) (Note 3) ....................... $86,496,063      $60,097,432      $54,833,742
Cash ............................................................      31,429               --            4,552
Receivable for investments sold .................................   1,700,000          731,087               --
Interest receivable .............................................     653,233        1,053,056          970,084
Prepaid expenses and other assets ...............................         920            1,579              532
                                                                   ----------       ----------       ----------
                                                                   88,881,645       61,883,154       55,808,910
                                                                   ----------       ----------       ----------

LIABILITIES
Disbursements in excess of demand deposit cash ..................      40,976           60,579        1,007,543
Payable for investments purchased ...............................   3,000,000        1,002,129        2,620,324
Payable for capital shares redeemed .............................      53,109           67,428          106,355
Payable to affiliates (Note 2) ..................................      48,824           34,269           29,289
Dividends payable ...............................................       7,059           16,174            7,326
Accrued expenses and other liabilities ..........................       1,285               --            1,014
                                                                   ----------       ----------       ----------
                                                                    3,151,253        1,180,579        3,771,851
                                                                   ----------       ----------       ----------
Net Assets Applicable to Outstanding Shares ..................... $85,730,392      $60,702,575      $52,037,059
                                                                  ===========      ===========      ===========

CAPITAL SHARES
Outstanding (Unlimited number of shares authorized) .............  85,730,392        5,630,908        4,479,317
                                                                   ==========        =========        =========
Net Asset Value Per Share .......................................       $1.00           $10.78           $11.62
                                                                   ==========        =========        =========

NET ASSETS CONSIST OF:
Capital paid in ................................................. $85,730,392      $58,703,137      $49,187,843
Accumulated net realized gain (loss) on investment transactions .          --          109,230          (83,501)
Net unrealized appreciation on investments (Note 3) .............          --        1,890,208        2,932,717
                                                                   ----------       ----------       ----------
                                                                  $85,730,392      $60,702,575      $52,037,059
                                                                  ===========      ===========      ===========
</TABLE>
See Notes to Financial Statements


Annual Report                          Statements of Assets and Liabilities   25

<TABLE>
<CAPTION>
                            STATEMENTS OF OPERATIONS

YEAR ENDED MAY 31, 1997

                                                                     TAX-FREE     INTERMEDIATE-TERM     LONG-TERM
                                                                   MONEY MARKET       TAX-FREE          TAX-FREE

INVESTMENT INCOME
Income:
<S>                                                                 <C>              <C>             <C>       
Interest .......................................................    $3,217,484       $3,462,907      $3,161,398
                                                                    ----------       ----------      ----------

Expenses (Note 2):
Investment advisory fees .......................................       383,093          268,199         229,610
Administrative fees ............................................        84,467           59,163          50,657
Transfer agency fees ...........................................        61,414           42,037          40,010
Printing and postage ...........................................        28,735           17,296          15,126
Auditing and legal fees ........................................        22,577           16,857          14,877
Registration and filing fees ...................................        21,484           16,503          16,263
Custodian fees .................................................        16,184            9,472          10,988
Telephone expenses .............................................         6,176            2,916           1,843
Trustees' fees and expenses ....................................         4,731            3,331           2,783
Other operating expenses .......................................         9,129           16,586          11,599
                                                                    ----------       ----------      ----------
  Total expenses ...............................................       637,990          452,360         393,756
Amount waived (Note 2) .........................................       (41,239)         (33,983)        (34,210)
                                                                    ----------       ----------      ----------
  Net expenses .................................................       596,751          418,377         359,546
                                                                    ----------       ----------      ----------
Net investment income ..........................................     2,620,733        3,044,530       2,801,852
                                                                    ----------       ----------      ----------

REALIZED AND UNREALIZED GAIN ON INVESTMENTS  (NOTE 3)
Net realized gain on investments ...............................            --          546,887         344,419
Change in net unrealized appreciation on investments ...........            --          170,155       1,220,273
                                                                    ----------       ----------      ----------

Net realized and unrealized
gain on investments ............................................            --          717,042       1,564,692
                                                                    ----------       ----------      ----------

Net Increase in Net Assets
Resulting from Operations ......................................    $2,620,733       $3,761,572      $4,366,544
                                                                    ==========       ==========      ==========
</TABLE>

See Notes to Financial Statements


26   Statements of Operations                       American Century Investments

<TABLE>
<CAPTION>
                      STATEMENTS OF CHANGES IN NET ASSETS

YEARS ENDED MAY 31, 1997
AND MAY 31, 1996

                                               TAX-FREE              INTERMEDIATE-TERM           LONG-TERM
                                             MONEY MARKET                TAX-FREE                TAX-FREE

Increase (Decrease) in Net Assets         1997        1996         1997         1996        1997         1996
OPERATIONS
<S>                                  <C>          <C>          <C>         <C>          <C>          <C>        
Net investment income ...............$  2,620,733 $ 2,878,179  $ 3,044,530 $  3,047,444 $  2,801,852 $ 2,701,979
Net realized gain on investments ....          --          --      546,887      346,493      344,419     735,144
Change in net unrealized appreciation
  (depreciation) on investments .....          --          --      170,155     (671,581)   1,220,273  (1,549,360)
                                        ---------   ---------    ---------    ---------    ---------   ---------
Net increase in net assets
  resulting from operations .........   2,620,733   2,878,179    3,761,572    2,722,356    4,366,544   1,887,763
                                        ---------   ---------    ---------    ---------    ---------   ---------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income ..........  (2,620,733) (2,878,179)  (3,044,530)  (3,047,444)  (2,801,852) (2,701,979)
                                        ---------   ---------    ---------    ---------    ---------   ---------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ...........  79,662,054  93,328,673   18,099,578   12,956,225   46,165,912  64,939,756
Proceeds from reinvestment of
  distributions .....................   2,479,220   2,751,052    2,309,108    2,324,043    2,122,387   2,023,443
Payments for shares redeemed ........ (87,528,514)(96,996,191) (23,323,252) (16,958,622) (49,197,675)(62,081,385)
                                        ---------   ---------    ---------    ---------    ---------   ---------
Net increase (decrease) in net assets
  from capital share transactions ...  (5,387,240)   (916,466)  (2,914,566)  (1,678,354)    (909,376)  4,881,814
                                        ---------   ---------    ---------    ---------    ---------   ---------
Net increase (decrease)
  in net assets .....................  (5,387,240)   (916,466)  (2,197,524)  (2,003,442)     655,316   4,067,598

NET ASSETS
Beginning of year ...................  91,117,632  92,034,098   62,900,099   64,903,541   51,381,743  47,314,145
                                        ---------   ---------    ---------    ---------    ---------   ---------
End of year ......................... $85,730,392 $91,117,632  $60,702,575  $62,900,099  $52,037,059 $51,381,743
                                      =========== ===========  ===========  ===========  =========== ===========

TRANSACTIONS IN SHARES OF THE FUNDS
Sold ................................  79,662,054  93,328,673    1,678,585    1,196,927    4,024,839   5,611,693
Issued in reinvestment of
  distributions .....................   2,479,220   2,751,052      214,593      214,867      184,335     175,401
Redeemed ............................ (87,528,514)(96,996,191)  (2,163,552)  (1,570,164)  (4,279,706) (5,361,215)
                                      ----------- -----------   ----------   ----------   ----------  ---------- 
Net increase (decrease) .............  (5,387,240)   (916,466)    (270,374)    (158,370)     (70,532)    425,879
                                       ==========    ========     ========     ========      =======     =======
</TABLE>

See Notes to Financial Statements


Annual Report                           Statements of Changes in Net Assets   27


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997

1. Organization and Summary of Significant Accounting Policies

Organization--American  Century Municipal Trust (the Trust), is registered under
the Investment Company Act of 1940 as an open-end management investment company.
American  Century - Benham Tax-Free Money Market Fund (Money  Market),  American
Century  -  Benham  Intermediate-Term  Tax-Free  Fund  (Intermediate-Term),  and
American  Century - Benham  Long-Term  Tax-Free Fund (Long-Term) (the Funds) are
three of the six funds issued by the Trust. The Funds are diversified  under the
1940 Act.  The Funds'  objective  is to seek as high a level of  current  income
exempt from  federal  income  taxes as is  consistent  with  prudent  investment
management and conservation of shareholders' capital. The Funds invest primarily
in  municipal  obligations  with  maturities  based  on each  Fund's  investment
objectives.  The Funds may concentrate  their  investments in certain states and
therefore  may have more  exposure to credit risk  related to those  states than
funds that have broader geographical diversification.  The following significant
accounting  policies,  related to the Funds,  are in accordance  with accounting
policies generally accepted in the investment company industry.

Security  Valuations--Securities  held by Money  Market are valued at  amortized
cost,   which   approximates   current   market   value.   Securities   held  by
Intermediate-Term  and Long-Term  (collectively the "Variable-Price  Funds") are
valued at current market value as provided by a commercial pricing service or at
the mean of the most  recent  bid and  asked  prices.  When  valuations  are not
readily  available,  securities  are  valued  at fair  value  as  determined  in
accordance with procedures adopted by the Board of Trustees.

Security  Transactions--Security  transactions  are  accounted  for on the  date
purchased  or  sold.  Net  realized  gains  and  losses  are  determined  on the
identified cost basis, which is also used for federal income tax purposes.

Investment Income--Interest income is recorded on the accrual basis and includes
amortization  of premiums and discounts.  Premium and original issue discount is
amortized daily using the effective  interest rate method for the Variable-Price
Funds.  Market discount is recognized as income upon the sale or maturity of the
security for the Variable-Price  Funds. Premium and discount are amortized daily
on a straight-line basis for securities held by Money Market.

Income  Tax  Status--It  is the  policy  of the  Funds  to  distribute  all  net
investment  income  and  net  realized  capital  gains  to  shareholders  and to
otherwise qualify as a regulated  investment company under the provisions of the
Internal  Revenue Code.  Accordingly,  no provision has been made for federal or
state taxes.

Distributions to Shareholders--Distributions  from net investment income for the
Variable-Price Funds are declared daily and distributed  monthly.  Distributions
from net realized  gains for these Funds are declared and paid  annually.  Money
Market's dividends are declared and credited daily and distributed  monthly. The
Money Market Fund does not expect to realize any long-term  capital  gains,  and
accordingly, does not expect to pay any capital gain distributions.

For the year  ended May 31,  1997,  100% of the  Funds'  distributions  from net
investment income have been designated as exempt from federal income taxes.

At May 31, 1997, the Long-Term Fund had accumulated net realized loss carryovers
of $83,501 (expiring in 2004) which may be used to offset future taxable gains.

The character of distributions  made during the year from net investment  income
or net  realized  gains may differ  from  their  ultimate  characterization  for
federal income tax purposes due to differences in the  recognition of income and
expense items for financial reporting and tax purposes.

Supplementary  Information--Certain  officers and trustees of the Trust are also
officers and/or directors, and, as a group, controlling stockholders of American
Century  Companies,  Inc. (ACC), the parent of the Trust's  investment  advisor,
Benham Management  Corporation (BMC), the Trust's distributor,  American Century
Investment  Services,  Inc.  (ACIS),  and the Trust's  transfer agent,  American
Century Services Corporation (ACSC).

Futures  Contracts--The  Variable-Price  Funds  may buy and sell  interest  rate
futures  contracts  relating to debt  securities  and write and buy put and call
options relating to interest rate futures contracts.  The  Variable-Price  Funds
may use  futures and  options  transactions  to  maintain  cash  reserves  while
remaining fully invested, to facilitate trading, to reduce transaction costs, or
to pursue  higher  investment  returns  when a futures  contract  is priced more
attractively than its underlying security or index. One of the risks of entering
into  futures  may  include  the  possibility  that the  changes in value of the
contract  may  not  correlate  with  the  changes  in  value  of the  underlying
securities.  Upon  entering  into a futures  contract,  the Fund is  required to
deposit either cash or securities in an amount equal to a certain  percentage of
the contract value (initial margin).  Subsequent payments (variation margin) are
made or received daily,  in cash, by the Fund. The variation  margin is equal to
the daily change in the contract value and is recorded as an unrealized  gain or
loss. The Fund recognizes a realized gain or loss when the contract is closed or
expires.


28   Notes to Financial Statements                  American Century Investments


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997

Use of Estimates--  The  preparation of financial  statements in conformity with
generally accepted  accounting  principles requires management to make estimates
and assumptions  that affect the reported  amounts of assets and liabilities and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements  and the reported  amounts of increases  and  decreases in net assets
from  operations  during the  period.  Actual  results  could  differ from these
estimates.

- --------------------------------------------------------------------------------
2. Transactions with Related Parties

The  Trust has  entered  into an  Investment  Advisory  Agreement  with BMC that
provides  the  Trust  with  investment  advisory  services  in  exchange  for an
investment  advisory  fee.  ACSC pays all  compensation  of Trust  officers  and
trustees who are officers or  directors  of ACC or any of its  subsidiaries.  In
addition,  promotion and  distribution  expenses are paid by BMC. The investment
advisory  fee is paid  monthly  by each Fund  based on its pro rata share of the
dollar amount derived from applying the Trust's average daily closing net assets
to the following annualized investment advisory fee schedule.

          0.50% of the first $100 million 
          0.45% of the next $100 million 
          0.40% of the next $100 million  
          0.35% of the next $100 million 
          0.30% of the next $100 million  
          0.25% of the next $1 billion 
          0.24% of the next $1 billion
          0.23% of the next $1 billion  
          0.22% of the next $1 billion 
          0.21% of the next $1 billion 
          0.20% of the next $1 billion
          0.19% of the average daily net assets over $6.5 billion

The Trust has an  Administrative  Services and Transfer  Agency  Agreement  with
ACSC. Under the agreement,  ACSC provides  substantially all  administrative and
transfer agency services necessary to operate the Funds. Fees for these services
are based on transaction volume,  number of accounts,  and average daily closing
net assets for funds advised by BMC.

The Trust has an additional agreement with BMC pursuant to which BMC established
a contractual  expense guarantee that limits Fund expenses (excluding items such
as brokerage  commissions,  taxes,  interest,  custodian  earnings credits,  and
extraordinary  expenses) to 0.67% of average daily net assets for the Funds. The
agreement provides that BMC may recover amounts (representing expenses in excess
of the Fund's expense  guarantee  rate) absorbed during the preceding 11 months,
if, and to the extent that,  for any given month,  the Fund's  expenses are less
than the expense guarantee rate in effect at that time.

The payables to  affiliates  as of May 31, 1997,  based on the above  agreements
were as follows:
                                  Intermediate-
                       Money Market   Term   Long-Term
Investment Advisor ....   $30,707   $22,152  $18,685
Administrative Services
and Transfer Agent ....    18,117    12,117   10,604
                           ------    ------   ------
                          $48,824   $34,269  $29,289
                        =========  ========  ========

On April 25, 1997, the Board of Trustees  approved a plan to implement a unified
management fee, which would replace the existing contracts between the Funds and
related parties.  Such plan is subject to shareholder approval and will be voted
on in July,  1997.  The results of the vote were unknown at the time this report
was printed.

The Trust has a  distribution  agreement  with ACIS,  which is  responsible  for
promoting sales of and distributing the Trust's shares.

- --------------------------------------------------------------------------------
3. Investment Transactions

The aggregate cost of municipal debt obligations purchased (excluding short-term
investments)  for  the  year  ended  May 31,  1997,  for  Intermediate-Term  and
Long-Term totaled $24,908,955 and $40,101,582,  respectively.  The proceeds from
sales of municipal debt obligations  (excluding short-term  investments) for the
year ended May 31, 1997, for Intermediate-Term and Long-Term totaled $26,909,077
and $38,745,073, respectively.

As  of   May   31,   1997,   accumulated   net   unrealized   appreciation   for
Intermediate-Term  and Long-Term were $1,890,208 and  $2,932,717,  respectively,
consisting  of  unrealized  appreciation  of  $1,897,615  and  $3,096,989,   and
unrealized depreciation of $7,407 and $164,272, respectively. The aggregate cost
of  investments  for federal  income tax  purposes  was the same as the cost for
financial reporting purposes.


Annual Report                                 Notes to Financial Statements   29

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS
                             TAX-FREE MONEY MARKET

                                                     For a Share Outstanding Throughout the Years Ended May 31

                                                    1997         1996         1995         1994          1993

PER-SHARE DATA
Net Asset Value,
<S>                                                 <C>          <C>          <C>          <C>          <C>  
Beginning of Year ..............................    $1.00        $1.00        $1.00        $1.00        $1.00
                                                    -----        -----        -----        -----        -----
Income From Investment Operations
  Net Investment Income ........................     0.03         0.03         0.03         0.02         0.02
                                                     ----         ----         ----         ----         ----
Distributions
  From Net Investment Income ...................    (0.03)       (0.03)       (0.03)       (0.02)       (0.02)
                                                    -----        -----        -----        -----        ----- 
Net Asset Value, End of Year ...................    $1.00        $1.00        $1.00        $1.00        $1.00
                                                    =====        =====        =====        =====        =====
  Total Return(1) ..............................     2.98%        3.19%        2.95%        1.92%        2.12%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ..........................     0.67%        0.65%        0.66%        0.67%        0.68%
Ratio of Net Investment Income
to Average Net Assets ..........................     2.93%        3.12%        2.88%        1.89%        2.10%
Net Assets, End
of Year (in thousands) .........................   $85,730      $91,118      $92,034     $109,818     $109,875

(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any.
</TABLE>

See Notes to Financial Statements


30   Financial Highlights                           American Century Investments

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS
                           INTERMEDIATE-TERM TAX-FREE

                                                     For a Share Outstanding Throughout the Years Ended May 31

                                                    1997         1996         1995         1994          1993

PER-SHARE DATA
Net Asset Value,
<S>                                                <C>          <C>          <C>          <C>          <C>   
Beginning of Year ..............................   $10.66       $10.71       $10.60       $10.90       $10.48
                                                   ------       ------       ------       ------       ------
Income From Investment Operations
  Net Investment Income ........................     0.52         0.52         0.50         0.51         0.52
  Net Realized and Unrealized Gain (Loss)
  on Investment Transactions ...................     0.12        (0.05)        0.15        (0.19)        0.53
                                                     ----        -----         ----        -----         ----
  Total From Investment Operations .............     0.64         0.47         0.65         0.32         1.05
                                                     ----         ----         ----         ----         ----
Distributions
  From Net Investment Income ...................    (0.52)       (0.52)       (0.50)       (0.51)       (0.52)
  From Net Realized Capital Gains ..............    --           --           (0.04)       (0.11)       (0.11)
                                                    -----        -----        -----        -----        ----- 
  Total Distributions ..........................    (0.52)       (0.52)       (0.54)       (0.62)       (0.63)
                                                    -----        -----        -----        -----        ----- 
Net Asset Value, End of Year ...................   $10.78       $10.66       $10.71       $10.60       $10.90
                                                   ======       ======       ======       ======       ======
  Total Return(1) ..............................     6.16%        4.38%        6.40%        2.93%       10.26%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ..........................     0.67%        0.70%        0.66%        0.67%        0.72%
Ratio of Net Investment Income
to Average Net Assets ..........................     4.87%        4.73%        4.82%        4.61%        4.81%
Portfolio Turnover Rate ........................       40%          46%          47%          46%          36%
Net Assets, End
of Year (in thousands) .........................   $60,703      $62,900      $64,904      $70,925      $67,550

(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any.
</TABLE>

See Notes to Financial Statements


Annual Report                                          Financial Highlights   31

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS
                               LONG-TERM TAX-FREE

                                                      For a Share Outstanding Throughout the Years Ended May 31

                                                    1997         1996         1995         1994          1993

PER-SHARE DATA
Net Asset Value,
<S>                                                <C>          <C>          <C>          <C>          <C>   
Beginning of Year ..............................   $11.29       $11.47       $11.26       $11.92       $11.26
                                                   ------       ------       ------       ------       ------
Income From Investment Operations
  Net Investment Income ........................     0.60         0.61         0.62         0.62         0.63
  Net Realized and Unrealized Gain (Loss)
  on Investment Transactions ...................     0.33        (0.18)        0.27        (0.42)        0.92
                                                     ----        -----         ----        -----         ----
  Total From Investment Operations .............     0.93         0.43         0.89         0.20         1.55
                                                     ----         ----         ----         ----         ----
Distributions
  From Net Investment Income ...................    (0.60)       (0.61)       (0.62)       (0.62)       (0.63)
  From Net Realized Capital Gains ..............    --           --           (0.06)       (0.24)       (0.26)
                                                    -----        -----        -----        -----        ----- 
  Total Distributions ..........................    (0.60)       (0.61)       (0.68)       (0.86)       (0.89)
                                                    -----        -----        -----        -----        ----- 
Net Asset Value, End of Year ...................   $11.62       $11.29       $11.47       $11.26       $11.92
                                                   ======       ======       ======       ======       ======
Total Return(1) ................................     8.41%        3.75%        8.29%        1.54%       14.61%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ..........................     0.67%        0.70%        0.66%        0.67%        0.72%
Ratio of Net Investment Income
to Average Net Assets ..........................     5.21%        5.22%        5.59%        5.16%        5.40%
Portfolio Turnover Rate ........................       75%          49%          34%          39%         105%
Net Assets, End
of Year (in thousands) .........................   $52,037      $51,382      $47,314      $57,330      $54,241

(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any.
</TABLE>

See Notes to Financial Statements


32   Financial Highlights                           American Century Investments


                          INDEPENDENT AUDITORS' REPORT

The Board of Trustees and Shareholders
American Century Municipal Trust:

We have audited the accompanying statements of assets and liabilities, including
the schedules of investment  securities,  of American  Century - Benham Tax-Free
Money Market Fund, American Century - Benham Intermediate-Term Tax-Free Fund and
American  Century  -  Benham  Long-Term  Tax-Free  Fund  (three  of  the  series
comprising  American Century Municipal Trust) (the Funds) as of May 31, 1997 and
the related  statements of operations for the year then ended, the statements of
changes in net assets for each of the two years then  ended,  and the  financial
highlights for each of the periods  presented.  These  financial  statements and
financial  highlights  are the  responsibility  of the  Funds'  management.  Our
responsibility  is to  express  an opinion  on these  financial  statements  and
financial highlights based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about whether the financial  statements and the financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  Our procedures included  confirmation of securities owned as of May
31, 1997,  by  correspondence  with the  custodian  and  brokers.  An audit also
includes assessing the accounting principles used and significant estimates made
by  management,   as  well  as  evaluating  the  overall   financial   statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  the financial  statements and the financial highlights referred
to above present fairly, in all material respects, the financial position of the
Funds as of May 31, 1997, the results of their operations,  the changes in their
net assets and the financial  highlights  for the periods  indicated  above,  in
conformity with generally accepted accounting principles.

/s/KPMG Peat Marwick LLP 
KPMG Peat Marwick LLP 

Kansas City, Missouri
July 7, 1997


Annual Report                                  Independent Auditors' Report   33


                                     NOTES


34   Notes                                          American Century Investments


                                     NOTES


Annual Report                                                         Notes   35


                             BACKGROUND INFORMATION

Investment Philosophy & Policies

American Century  Investments offers 42 fixed-income  funds,  ranging from money
market funds to long-term  bond funds and including  both taxable and tax-exempt
funds.

Tax-Free  Money  Market  seeks to provide  interest  income  exempt from federal
income taxes by investing in short-term  municipal  securities.  Investments  in
Tax-Free Money Market are neither insured nor guaranteed by the U.S. government.
Yields will fluctuate,  and there can be no assurance that the fund will be able
to maintain a stable net asset value of $1 per share.

Intermediate-Term  Tax-Free is a variable-price  bond fund that seeks to provide
interest  income  exempt from  federal  income  taxes by  investing in municipal
securities.  The fund maintains a weighted  average  maturity of from five to 10
years.

Long-Term Tax-Free is a variable-price  bond fund that seeks to provide interest
income  exempt from federal  income taxes by investing in municipal  securities.
The fund maintains a weighted average maturity of 10 or more years.

Comparative Indices

The indices listed below are used in the report to serve as a comparison for the
performance of a fund. They are not investment products available for purchase.

The Lehman Brothers Five-Year  Municipal General Obligation Index is a municipal
bond index  composed of more than 11,000  bonds with  maturities  of four to six
years.  The bonds are rated BBB or higher by Standard & Poor's,  with an average
rating of AA. The average maturity of the index is five years.

The  Lehman  Brothers  Long-Term  Municipal  Bond  Index  is  composed  of 8,000
municipal  bonds.  The bonds  are all  investment-grade,  fixed-rate,  long-term
maturities (greater than two years) and are selected from issues larger than $50
million dated since January 1994.

Lipper Rankings

Lipper Analytical  Services,  Inc. is an independent mutual fund ranking service
that groups funds according to their investment  objectives.  Rankings are based
on average  annual  returns  for each fund in a given  category  for the periods
indicated. Rankings are not included for periods less than one year.

The Lipper categories for the Tax-Free funds are:

Tax-Exempt  Money Market Funds  (Tax-Free  Money  Market)--funds  that intend to
maintain a constant net asset value and that invest in high-  quality  municipal
obligations with dollar-weighted average maturities of less than 90 days.

Intermediate  Municipal  Debt  Funds  (Tax-Free  Intermediate-Term)--funds  that
invest in municipal debt issues with dollar-weighted  average maturities of five
to 10 years.

General  Municipal Debt Funds (Tax-Free  Long-Term)--funds  that invest at least
65% of their  assets in  municipal  debt issues in the top four  credit  ratings
(AAA, AA, A and BBB).



PORTFOLIO MANAGEMENT TEAM
Senior Municipal Portfolio Manager          Dave MacEwen
Municipal Portfolio Managers                Bryan Karcher, Joel Silva
Associate Municipal Portfolio Manager       Ken Salinger
Municipal Credit Research Manager           Steven Permut
Credit Analysts                             Scott Lord, Bill McClintock,
                                            David Moore, Tim Benham


36   Background Information                         American Century Investments


                                    GLOSSARY

Returns

o Total  Return  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

o Average Annual Returns  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on pages 30-32.

Yields

o 7-Day  Current  Yield  is  calculated  based  on the  income  generated  by an
investment  in the fund over a seven-day  period and is  expressed  as an annual
percentage rate.

o 7-Day  Effective  Yield is  calculated  similarly,  although  this  figure  is
slightly  higher than the fund's 7-Day  Current  Yield because of the effects of
compounding.  The 7-Day  Effective  Yield  assumes  that income  earned from the
fund's investments is reinvested and generating additional income.

o 30-Day SEC Yield  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annual percentage rate based on the fund's share
price at the end of the 30-day  period.  The SEC yield  should be regarded as an
estimate of the fund's investment income, and it may not equal the fund's actual
income  distribution  rate, the income paid to a shareholder's  account,  or the
income reported in the fund's financial statements.

o  Tax-Equivalent  Yields show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

Investment Terms

o Basis Point--a basis point equals one  one-hundredth of a percentage point (or
0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

o Yield Curve--a graphic representation of the relationship between maturity and
yield  for  fixed-income   securities.   Yield  curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

Portfolio Statistics

o Number of Securities--the  number of different  securities held by a fund on a
given date.

o  Weighted  Average  Maturity  (WAM)--a  measurement  of the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio mature, weighted by dollar amount.

o  Average  Duration--another  measure  of  the  sensitivity  of a  fixed-income
portfolio to interest rate changes.  Duration is a time-weighted  average of the
interest and principal payments of the securities in a portfolio.

o Expense Ratio--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

Types of Municipal Securities

o AMT Paper--instruments  with income subject to the federal alternative minimum
tax.

o  COPs/Leases--securities  issued to finance public property improvements (such
as city halls and police stations) and equipment purchases.

o  GO Bonds--general obligation securities backed by the taxing power of the
issuer.

o  Land-Secured  Bonds--securities  such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.

o Municipal Commercial Paper (CP)--high-grade  short-term securities backed by a
line of credit from a bank.

o  Municipal Notes--securities with maturities of two years or less.

o Prerefunded Bonds/ETM Bonds--securities  refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

o  Revenue  Bonds--securities  backed by  revenues  from  sales  taxes or from a
specific  project,  system or facility (such as a hospital,  electric utility or
water system).

o  Variable-Rate  Demand Notes  (VRDNs)--securities  that track market  interest
rates and  stabilize  their  market  values  using  periodic  (daily or  weekly)
interest rate adjustments.


Annual Report                                                      Glossary   37

[american century logo]
American
Century(sm)

P.O. Box 419200
Kansas City, Missouri
64141-6200

Investor Services:
1-800-345-2021 or 816-531-5575

Automated Information Line:
1-800-345-8765

Telecommunications Device for the Deaf:
1-800-634-4113 or 816-444-3485

Fax: 816-340-7962

Internet: www.americancentury.com


AMERICAN CENTURY MUNICIPAL TRUST

Investment Manager
Benham Management Corporation


This  report and the  statements  it  contains  are  submitted  for the  general
information of our  shareholders.  The report is not authorized for distribution
to  prospective  investors  unless  preceded  or  accompanied  by  an  effective
prospectus.

American Century Investment Services, Inc.


9707           [recycled logo]
SH-BKT-9000       Recycled
<PAGE>
                                 ANNUAL REPORT

                             [american century logo]
                                    American
                                  Century(sm)

                                  May 31, 1997

                                     BENHAM
                                     GROUP

                         Florida Municipal Money Market
                      Florida Intermediate-Term Municipal

[front cover]

                               TABLE OF CONTENTS

Report Highlights........................................... 1
Our Message to You.......................................... 2
Period Overview............................................. 3
Florida Municipal Credit Review............................. 4
Florida Municipal Money Market
   Performance & Portfolio Information...................... 5
   Management Q & A......................................... 6
   Schedule of Investments.................................. 8
   Financial Highlights.....................................23
Florida Intermediate-Term Municipal
   Performance & Portfolio Information......................11
   Management Q & A.........................................12
   Schedule of Investments..................................15
   Financial Highlights.....................................24
Statements of Assets and Liabilities........................17
Statements of Operations....................................18
Statements of Changes in Net Assets.........................19
Notes to Financial Statements...............................20
Independent Auditors' Report................................25
Background Information
   Investment Philosophy & Policies.........................28
   Comparative Indices......................................28
   Lipper Rankings..........................................28
   Portfolio Management Team................................28
Glossary....................................................29

American Century  Investments offers you nearly 70 fund choices covering stocks,
bonds, money markets,  specialty investments and blended portfolios. To help you
find the funds that may meet your needs, we have divided  American Century funds
into three groups based on investment style and objectives.  These groups, which
appear below, are designed to help simplify your fund decisions.

                 AMERICAN CENTURY INVESTMENTS - FAMILY OF FUNDS

       BENHAM GROUP           AMERICAN CENTURY GROUP     TWENTIETH CENTURY GROUP

    MONEY MARKET FUNDS          ASSET ALLOCATION &
   GOVERNMENT BOND FUNDS          BALANCED FUNDS            U.S. GROWTH FUNDS
  DIVERSIFIED BOND FUNDS     CONSERVATIVE EQUITY FUNDS     INTERNATIONAL FUNDS
   MUNICIPAL BOND FUNDS           SPECIALTY FUNDS
    Florida Municipal
       Money Market
Florida Intermediate-Term
         Municipal

We welcome your comments or questions about this report.  
See the back cover for ways to contact us by mail, phone or e-mail.

Twentieth  Century and the Benham Group are registered marks of American Century
Services Corporation and Benham Management Corporation,  respectively.  American
Century is a service mark of American Century Services Corporation.


                                                    American Century Investments


                               REPORT HIGHLIGHTS

Period Overview

o The U.S.  economy  grew at a healthy clip during the fiscal year ended May 31,
1997, while inflation remained relatively subdued. A steady increase in new jobs
and strong consumer spending helped fuel that growth.

o Concerned  that strong  economic  growth might lead to higher  inflation,  the
Federal  Reserve  raised  short-term  interest  rates in late  March--the  first
increase since February 1995.

o Municipal  bonds posted  strong  returns  despite the Fed's  decision to raise
interest rates.

o After  falling  in  response  to the Fed's rate hike,  municipal  bond  prices
rallied in May thanks to a string of economic data that has provided evidence of
moderating economic growth.

Florida Municipal Credit Review

o Florida's  economy  prospered  during the fiscal year,  improving  the state's
municipal credit quality during the fiscal year.

o The  state's  credit  rating was  upgraded  because  of  greater-than-expected
general fund revenues and sound financial management.

o Going forward,  Florida's burgeoning population and a growing wave of anti-tax
sentiment could cause repercussions that will bear close scrutiny. Despite these
concerns, our outlook for Florida's credit quality is optimistic.

Florida Municipal Money Market

o The fund's  performance  resulted in an impressive ranking among its peers for
the  fiscal  year with the help of a  management  expense  waiver  that ended in
December 1996.

o The fund's  shortened  average maturity allowed us to more quickly reinvest in
higher-yielding securities after the Fed's March interest rate increase.

o Going forward,  we will look to buy  longer-maturity  securities  that we feel
provide sufficient pick-up over short-term municipals.

Florida Intermediate-Term Municipal

o The fund  produced a strong  return for the fiscal  year,  finishing  strongly
compared with its peer group.

o  Successful  swap  trades--exchanges  of  securities  between  the  fund and a
broker--were the main reason behind the fund's solid performance.

o With net assets  exceeding the $25 million mark in mid-June,  investors should
now be able to monitor the fund's performance in their local newspapers.

o Going forward,  with the help of our credit research team, we will continue to
look for  undervalued  securities that we believe have the chance to appreciate.
We also plan to continue swapping securities enhance fund returns.

                               Florida Municipal
                                  Money Market

                      Total Returns:         AS OF 5/31/97
                         6 Months                   1.73%*
                         1 Year                      3.55%

                      7-Day Current Yield:           3.42%

                      Net Assets:           $112.1 million
                         (AS of 5/31/97)

                      Inception Date:              4/11/94

                      Ticker Symbol:                 BEFXX


                                    Florida
                          Intermediate-Term Municipal

                      Total Returns:         AS OF 5/31/97
                         6 Months                   1.95%*
                         1 Year                      6.63%

                      Net Assets:            $16.5 million
                         (AS of 5/31/97)

                      Inception Date:              4/11/94

                      Ticker Symbol:                 ACBFX

                      * Not annualized.


                 Many of the investment terms in this report are
                       defined in the Glossary on page 29.


Annual Report                                             Report Highlights    1


                               OUR MESSAGE TO YOU

[photo of James E. Stowers III and James M. Benham]

During  the fiscal  year ended May 31,  1997,  investors  in the Benham  Florida
municipal  funds  earned  solid,  competitive  returns as  municipal  securities
outperformed  Treasurys for much of the period.  The extended economic expansion
that  propelled  U.S.  stock markets to new highs also  benefited  municipal and
corporate bonds, and low levels of inflation provided bond investors with higher
real  rates  of  return.  In  Florida,  a  strong  economy  and  low  levels  of
unemployment  boosted  tax  revenues  for local  governments,  leading to credit
quality upgrades.

American  Century's  municipal bond  management  team is well positioned to take
advantage  of  attractive  opportunities  in  the  municipal  markets.  We  have
continued to expand our very talented team of municipal  credit  analysts,  most
recently  adding  David  Moore,  who comes to us from  Keystone  Investments  in
Boston.  The  credit  team  contributed  significantly  to our  ability  to find
undervalued municipal securities that ultimately enhanced fund returns.

We also strengthened our corporate team. In June, Bill Lyons, American Century's
chief operating officer,  was named president,  assuming full responsibility for
the company's day-to-day  operations.  This change will allow Jim Stowers III to
focus more time on developing and refining new investment technologies and tools
that build on and leverage the proprietary  system his father pioneered 25 years
ago.   One  of  our  goals  is  to  ensure   that  we  continue  to  evolve  and
innovate--building  the  investment  tools  today that will help lead us and our
investors to success in the next century.

We appreciate your confidence in American Century and look forward to continuing
to serve you.

Sincerely,

/s/James E. Stowers III                     /s/James M. Benham
James E. Stowers III                        James M. Benham
Chief Executive Officer                     Vice Chairman
American Century Companies                  American Century Companies


2    Our Message to You                             American Century Investments


                                PERIOD OVERVIEW

U.S. Economy

The U.S. economy grew at a healthy pace during the 12 months ended May 31, 1997.
After  expanding  at a 2.2% annual rate in the third  quarter of 1996,  the U.S.
economy surged ahead at an impressive 3.8% rate in the fourth quarter.  Economic
growth hit a 10-year high of 5.9% in the first quarter of 1997.  Strong consumer
spending and rising consumer confidence,  which reached a 28-year high in April,
fueled the robust growth.  In addition,  the unemployment rate fell from 5.4% in
January to a 23-year low of 4.8% in May.

Inflation--as  measured by the  government's  consumer  price  index--rose  at a
modest 1.4%  annual  rate  during the first five months of 1997.  That stands in
sharp contrast to 1996, when prices rose by 3.6% --the largest yearly gain since
1990.

Concerned  that vigorous  economic  growth might lead to higher  inflation,  the
Federal Reserve (the Fed) raised  short-term  interest rates in March--the first
such increase since  February 1995.  Though the Fed held rates steady at its May
interest  rate  policy  meeting,  tight labor  markets and strong  manufacturing
activity have kept market participants from ruling out another rate hike.

Municipal Bond Market

Municipal  bonds produced  strong  returns as interest  rates  declined  overall
during the 12-month period.  Longer-term  securities,  which usually  appreciate
more than short-term securities when rates fall, performed best. For the period,
the Lehman  Long-Term  Municipal  Bond  Index  rose by 10.04%,  while the Lehman
Five-Year General Obligation Index rose by 6.09%.

Bond yields were at their  highest  point at the  beginning of the period,  when
strong job growth  led many to believe  that the Fed was poised to raise  rates.
However,  expectations for higher rates softened after economic growth moderated
in the third quarter and the Fed continued to hold interest rates steady.  Aided
by strong demand from  insurance  companies,  municipal  bond prices rallied and
yields fell. By December, short-term municipal yields had fallen nearly 60 basis
points from where they began the period,  while long-term  municipal yields were
nearly 70 basis points lower.

Signs  of  stronger-than-expected  economic  growth  near  the end of the  first
quarter  of 1997  resurrected  fears  that  the Fed  would  raise  rates to keep
inflation in check.  As a result,  municipal  bond yields rose steadily in March
and April.

Recent data  suggest that the rate of U.S.  economic  growth  slowed  during the
second  quarter,  fueling a municipal  market  rally in May and June.  Municipal
bonds are also  benefiting  from  relatively  low levels of new  municipal  debt
issuance. Although demand from retail investors has tapered off recently, retail
demand was strong  during much of the fiscal year.  Any renewed  surge in demand
would support bond prices and dampen market volatility.

[line graph - data below]

MUNICIPAL YIELD CURVES

Years to Maturity       5/31/96          5/31/97
1                        3.800            3.850
2                        4.150            4.150
3                        4.370            4.350
4                        4.520            4.500
5                        4.640            4.600
6                        4.740            4.660
7                        4.840            4.720
8                        4.940            4.780
9                        5.040            4.840
10                       5.140            4.900
11                       5.230            4.976
12                       5.320            5.052
13                       5.410            5.128
14                       5.500            5.204
15                       5.590            5.280
16                       5.624            5.308
17                       5.658            5.336
18                       5.692            5.364
19                       5.726            5.392
20                       5.760            5.420
21                       5.768            5.426
22                       5.776            5.432
23                       5.784            5.438
24                       5.792            5.444
25                       5.800            5.450
26                       5.804            5.454
27                       5.808            5.458
28                       5.812            5.462
29                       5.816            5.466
30                       5.820            5.470

Source: Bloomberg Financial Markets


Annual Report                                               Period Overview    3


                        FLORIDA MUNICIPAL CREDIT REVIEW

Strong economic growth improved  Florida  municipal credit quality during the 12
months  ended May 31,  1997.  Though the pace of  economic  growth  has  slowed,
Florida's economy expanded faster than the national average during 1996.

As the accompanying graph indicates, Florida's unemployment rate fell during the
period. By June 1997, the state's unemployment rate stood at 4.9%, compared with
a national rate of 5.0%.  Employment  growth was  concentrated in  construction,
services and trade jobs.

Over  the  past  decade,  the  state's  unemployment  rate  declined  despite  a
burgeoning  population.  During that period,  Florida's  working-age  population
expanded by 30%, while the overall population grew  approximately  twice as fast
as the national average. In addition,  Florida residents' per capita income rose
faster than the nation as a whole.

Florida  continued  to  benefit  from  its  advantageous   geographic  position.
Internationally,  the state is well positioned to benefit from the growth of the
emerging  markets of the Caribbean and Central and South  America.  Florida also
remains a popular  tourist  destination,  with an estimated 44 million  tourists
expected to visit the state in 1997.

Florida's strong economic growth  contributed to  greater-than-expected  general
fund  revenues  during  fiscal  1996,  the  latest  period  for  which  data are
available.  In addition,  the state  continued to  demonstrate  sound  financial
management,  building a constitutionally  mandated budget stabilization  reserve
over the last several years. As a result, the state's credit rating was recently
upgraded by Standard and Poor's, Inc.

Nevertheless,  the state is likely to face capital  needs in regard to education
and  development  in coming  years.  Rapid  population  growth is straining  the
state's infrastructure,  particularly its public school system. Florida has made
significant  progress on welfare  reform,  due largely to  declining  caseloads.
However,  the  ultimate  success of welfare  reform  will  depend on the state's
ability to generate employment opportunities for current welfare recipients.

Running counter to these  long-term  capital needs is a growing wave of anti-tax
sentiment.  Florida  voters have often failed to approve new taxes to fund local
school  improvements,  while the threat of anti-tax  ballot  measures  looms. It
remains to be seen how the state will address its need for large capital outlays
in the future.

Despite these  potentially  negative  factors,  our outlook for Florida's credit
quality  is  optimistic.   Florida  and  its  municipalities   follow  generally
conservative  fiscal  practices,  and we expect the  state's  credit  quality to
remain stable for the next two or three years.

[line graph - data below]

FLORIDA UNEMPLOYMENT RATE

3/31/93         7.1%
6/30/93         7.0%
9/30/93         6.9%
12/31/93        7.0%
3/31/94         6.9%
6/30/94         6.7%
9/30/94         6.4%
12/31/94        5.9%
3/31/95         5.4%
6/30/95         5.5%
9/30/95         5.5%
12/31/95        5.4%
3/31/96         5.4%
6/30/96         5.0%
9/30/96         5.4%
12/31/96        4.5%
3/31/97         5.0%
6/30/97         4.9%

Source: Bureau of Labor Statistics


4    Florida Municipal Credit Review                American Century Investments


<TABLE>
<CAPTION>
                         FLORIDA MUNICIPAL MONEY MARKET


                                7-Day         7-Day                   7-Day Tax-Equivalent Yields
                               Current      Effective        28%           31%           36%          39.6%
                                Yield         Yield      Tax Bracket   Tax Bracket   Tax Bracket    Tax Bracket

YIELDS AS OF MAY 31, 1997
Florida Municipal
<S>                             <C>           <C>           <C>           <C>           <C>            <C>  
Money Market                    3.42%         3.48%         4.75%         4.96%         5.34%          5.66%


                                                                               AVERAGE ANNUAL RETURNS
                                                          6 MONTHS       1 YEAR        3 YEARS     LIFE OF FUND
TOTAL RETURNS AS OF MAY 31, 1997
Florida Municipal Money Market ...........................  1.73%         3.55%         3.71%          3.67%
Average Other States Tax-Exempt Money Market Fund(1) .....  1.57%         3.12%         3.23%          3.22%(2)
Fund's Ranking Among Other States
Tax-Exempt Money Market Funds(1) .........................   --        1 out of 33   1 out of 18  1 out of 17(2)

(1)  According to Lipper Analytical Services.

(2)  Since  4/30/94,  the date nearest the fund's  inception  for which data are
     available. Inception date was April 11, 1994.
</TABLE>

See pages 28-29 for more information about returns and Lipper fund rankings.

PORTFOLIO AT A GLANCE
                            5/31/97    5/31/96
Number of Securities          50         55
Weighted Average Maturity   48 days    50 days
Expense Ratio               0.12%*       0%*

* Until  December 31,  1996,  the fund's  management  fees were waived by Benham
Management  Corporation (BMC). As of January 1, 1997,  management fees are being
phased in at a rate of 0.10% each month  until the 0.61%  annual  expense cap is
reached.

Money market funds are neither insured nor guaranteed by the U.S. government.

Yields will fluctuate,  and there can be no assurance that the fund will be able
to maintain a stable $1.00 share price.


Annual Report                                Florida Municipal Money Market    5


                         FLORIDA MUNICIPAL MONEY MARKET

Management Q & A

An interview with Bryan Karcher,  a portfolio  manager on the Florida  municipal
funds management team.

How did the fund perform?

The fund continued to perform very well. For the fiscal year ended May 31, 1997,
the fund returned 3.55%, compared with the 3.12% average return of the 33 "Other
States Tax-Exempt Money Market Funds" tracked by Lipper Analytical Services. For
the fiscal year, the fund ranked #1 in its Lipper category,  and its longer-term
returns are similarly strong.  (See the Total Returns table on the previous page
for other fund performance comparisons.)

The fund's  returns were helped by the fact that Benham  Management  Corporation
waived its management  fee through  December 31, 1996. The absence of these fees
helped the fund achieve its #1 ranking.

Even with the management  fee, the fund continues to produce  tax-free income in
line with its peer  group  average.  According  to the June 20,  1997 Money Fund
Report,  the  fund's  7-day  current  yield was 3.32%,  compared  with the 3.33%
average for Florida money market funds.

Can you explain the recent changes to the fund's management fee?

Sure.  On January 1, 1997,  the fund began  absorbing  expenses  at a rate of 10
basis points per month. As of May 31, 1997, the management fee stood at 50 basis
points. The fund will continue to absorb expenses until reaching the contractual
expense cap of 61 basis points in July.

How was the fund positioned during the period?

We  allowed  the  fund's  average  maturity  to  decline  because  of a lack  of
attractively priced one-year municipal securities. For much of the first quarter
of 1997,  one-year munis traded in a range between 3.55% and 3.65%, which wasn't
much of a yield  pick-up over  shorter-term  munis  considering  the outlook for
interest  rates.  With the  expectation  that  the Fed  would  eventually  raise
short-term   interest  rates,  it  didn't  make  sense  to  purchase  relatively
low-yielding  one-year  securities.  Instead, we preferred to hold floaters that
reset their interest rates quickly to better capture the rise in rates.

As a result,  we allowed the fund's average maturity to fall to a low of 24 days
at the  beginning  of April,  compared  with a 46-day  average  maturity for the
fund's peers.  The fund's shorter  maturity  proved  beneficial when the Federal
Reserve raised  short-term  interest rates in late March.  (Reducing the average
maturity in a rising interest rate environment  allowed the fund to more quickly
reinvest matured assets in higher-yielding securities.)

[pie charts]

PORTFOLIO  COMPOSITION  BY SECURITY TYPE (as of 5/31/97) 
VRDNs 63% 
Bonds less than 1 Year 18% 
Commercial Paper 16% 
Municipal Notes 3%

PORTFOLIO  COMPOSITION  BY SECURITY TYPE (as of 11/30/96)  
VRDNs 72%  
Commercial Paper 15% 
Bonds less than 1 Year 13%


6    Florida Municipal Money Market                 American Century Investments


                         FLORIDA MUNICIPAL MONEY MARKET


But you aggressively extended the fund's average maturity in April. Why?

We lengthened  the fund's  maturity  because  one-year munis began to offer more
attractive  yields.  We were able to buy one-year  notes at an average  yield of
3.99%. We used this buying  opportunity to extend the fund's average maturity to
around 50 days by early May.  That  extension  proved timely  because  yields on
one-year Florida paper dropped back down to around 3.80% by early June.

Why were one-year  securities more attractive in April compared with the rest of
the period?

Yields rose in April partly because of expectations  for further Fed rate hikes,
despite the fact that the economy was slowing.  That concern  caused the spread,
or difference in yield,  between shorter paper and one-year securities to widen,
making one-year munis more attractive.  In addition,  money market fund outflows
typically increase during the April tax season. These outflows reduce the demand
for notes and may  actually  cause money market fund  managers to sell  one-year
notes if redemptions are greater than expected.

You increased the fund's weighting of commercial paper in May. Why?

We typically  increase  the fund's  weighting  of  commercial  paper each May to
lengthen the fund's average maturity. We use these securities to bridge June and
July,  when a flood of coupon  payments and maturing  securities  tends to cause
short-term  muni yields to fall. So far,  however,  demand for short-term  paper
hasn't been as strong as in years past--we suspect that many investors have been
putting  their  available  cash to work in the stock market.  As a result,  muni
rates haven't  fallen as sharply as they  typically do.  Still,  many  municipal
notes mature in July, which should bring some cash back to the muni market.

What's your outlook for interest rates going forward?

Our current  expectation is that economic  growth will continue to slow from its
breakneck  first-quarter pace. Inflation seems tame, having risen just 2.2% over
the last 12 months.  In  addition,  the "real"  federal  funds rate (the nominal
federal funds rate minus the  inflation  rate) is already at a level that should
inhibit  economic growth.  As a result,  we think further Fed rate increases are
unlikely.  Still, if wage pressures  increase,  fear of a Fed rate hike may send
short-term muni yields higher.

With this outlook in mind, what are your plans for the fund going forward?

We will look for  opportunities  to add more  one-year  paper to the fund in the
coming months if it looks  attractive  relative to  shorter-term  munis.  But we
don't  plan on  buying  one-year  paper  solely  to  maintain  a longer  average
maturity--we're  only planning to buy securities that we feel provide sufficient
yield pick-up over shorter-term munis based on the interest rate outlook.

[pie charts]

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/97)
SP1+ 75%
SP1 25%

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 11/30/96) 
SP1+ 76% 
SP1 22% 
SP2 2%


Annual Report                               Florida Municipal Money Market     7


                            SCHEDULE OF INVESTMENTS
                         FLORIDA MUNICIPAL MONEY MARKET

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

SHORT-TERM MUNICIPAL SECURITIES

$ 2,000,000   Brevard County Housing Finance
                Auth. Rev., (Palm Place), VRDN,
                4.00%, 6/4/97 (LOC: Chase
                Manhattan Bank)                                  $2,000,000
  1,000,000   Broward County Housing Finance
                Auth. Multi-Family Housing Rev.,
                (Margate Project), VRDN, 4.00%,
                6/4/97 (LOC: Chase Manhattan
                Bank)                                             1,000,000
  4,750,000   Broward County Housing Finance
                Auth. Multi-Family Housing Rev.,
                Series A, (Palm Aire Oxford),
                VRDN, 4.20%, 6/4/97 (SBBPA:
                Continental Casualty Co.)                         4,750,000
  3,250,000   Broward County Housing Finance
                Auth. Single Family Mortgage
                Rev., Series B, 4.05%, 4/1/98
                (GIC: GE Capital Corporation)                     3,250,000
  1,270,000   Broward County Industrial
                Development Rev., (Fast Real
                Estate Partners), VRDN, 4.00%,
                6/4/97 (LOC: Suntrust Bank
                South Florida, N.A.)                              1,270,000
  2,500,000   Broward County Industrial
                Development Rev., (HEICO),
                VRDN, 4.00%, 6/4/97 (LOC:
                Suntrust Bank South Florida,
                N.A.)                                             2,500,000
  2,615,000   Broward County Industrial
                Development Rev., (MDR Fitness
                Project), VRDN, 4.00%, 6/4/97
                (LOC: Suntrust Bank, Miami,
                N.A.)                                             2,615,000
  3,000,000   Broward County School District
                Rev., Series C, 4.50%, 4/22/98                    3,014,639
  4,000,000   City of Jacksonville Commercial
                Paper, 3.75%, 7/11/97 (LOC:
                Bayerische Landesbank
                Girozentrale and Suntrust Bank,
                Miami, N.A.)                                      4,000,000
  1,860,000   Coral Springs Industrial
                Development Rev., (Royal
                Plastics Group Project), VRDN,
                4.00%, 6/4/97 (LOC: Suntrust
                Bank South Florida, N.A.)                         1,860,000

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 2,000,000   Dade County Housing Finance
                Agency Single-Family Rev.,
                4.00%, 10/1/97                                   $2,000,000
    605,000   Dade County Industrial
                Development Auth. Rev., (DNS
                Mfg. #237), VRDN, 4.10%,
                6/4/97 (LOC:  Barnett Bank,
                N.A.)                                               605,000
  4,495,000   Dade County Industrial
                Development Auth. Rev., (IVAX
                Labs), VRDN, 4.30%, 6/4/97
                (LOC: Bank of Tokyo-Mitsubishi,
                Ltd.)                                             4,495,000
  1,000,000   Dade County Industrial
                Development Auth. Rev.,
                (Stephen M. Greene), VRDN,
                4.15%, 6/4/97 (LOC: Suntrust
                Bank, Miami, N.A.)                                1,000,000
  2,200,000   Dade County Resource Recovery
                Rev., 4.00%, 10/1/97 (AMBAC)                      2,200,000
  1,880,000   Dade County School Board
                Certificates of Participation,
                Series B, 4.25%, 8/1/97
                (AMBAC)                                           1,881,267
  4,295,000   Dade County Special Obligation
                Capital Asset Acquisition Rev.,
                VRDN, 4.30%, 6/4/97 (LOC:
                Sanwa Bank Ltd.)                                  4,295,000
  1,500,000   Escambia County Housing Finance
                Auth. Single Family Mortgage
                Rev., Series B, 3.75%, 2/20/98
                (GIC: Bayerishe Landesbank
                Girozentrale)                                     1,500,000
  1,965,000   Escambia County Housing Finance
                Auth. Single Family Mortgage
                Rev., VRDN, 4.10%, 6/5/97
                (LOC: Merrill Lynch & Co. Inc.)                   1,965,000
  3,900,000   Escambia County Industrial
                Development Auth. Rev., (Gelman
                Sciences), VRDN, 3.95%,
                6/4/97 (LOC:  NBD Bank
                Detroit)                                          3,900,000
  2,355,000   Florida Housing Finance Agency
                Multi-Family   Housing  Rev.,  Series  
                1989  E,  (Fairmont  Oaks
                Project), VRDN, 4.15%, 6/4/97 (LOC:
                Comerica Bank)                                    2,355,000

See Notes to Financial Statements


8    Florida Municipal Money Market                 American Century Investments


                            SCHEDULE OF INVESTMENTS
                         FLORIDA MUNICIPAL MONEY MARKET

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 4,650,000   Florida Housing Finance Agency
                Rev., (Ashley Lakes Project),
                VRDN, 4.00%, 6/4/97 (LOC:
                Barclays Bank PLC)                               $4,650,000
  4,400,000   Florida Housing Finance Agency
                Rev., (Belville-Oxford), VRDN, 
                4.20%, 6/4/97 (SBBPA:
                Continental Casualty Co.)                         4,400,000
  4,500,000   Florida Housing Finance Agency
                Rev., (Caribbean Key), VRDN,
                3.95%, 6/4/97 (LOC: KeyBank,
                N.A.)                                             4,500,000
  4,800,000   Florida Housing Finance Agency
                Rev., (Country Club Apartments),
                VRDN, 4.15%, 6/2/97 (LOC:
                Northern Trust Corp.)                             4,800,000
  2,500,000   Florida Housing Finance Agency
                Rev., (Heron Park Project), 
                VRDN, 4.00%, 6/4/97 (LOC:
                NationsBank N.A.)                                 2,500,000
  2,000,000   Florida Housing Finance Agency
                Rev., (Tiffany Club), VRDN, 4.00%,
                6/4/97 (LOC: NationsBank N.A.)                    2,000,000
    500,000   Florida State Board of Education
                Capital Outlay GO, Series B,
                5.625%, 6/1/98                                      507,997
  2,000,000   Highlands County Housing Finance
                Agency Rev., Series 1996 B,
                VRDN, 3.95%, 6/5/97 (LOC:
                Canadian Imperial Holdings, Inc.
                and Capital Markets Assurance
                Corp.)                                            2,000,000
  2,200,000   Hillsborough County Aviation Auth.
                Rev. Commercial Paper, 3.75%,
                8/15/97 (LOC: National
                Westminster Bank PLC)                             2,200,000
  1,465,000   Hillsborough County Port District
                Rev., (Tampa Port Auth.), 4.50%,
                6/1/97 (FSA)                                      1,465,000
  2,000,000   Indian River County Hospital
                Commercial Paper, 3.70%,
                8/15/97 (LOC: Kredietbank N.V.)                   2,000,000
    950,000   Indian River County Industrial
                Development Rev., (Florida
                Convales), VRDN, 3.95%,
                6/2/97 (LOC: Toronto Dominion
                Bank)                                               950,000

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 3,000,000   Jacksonville Electric Commercial
                Paper, 3.90%, 7/18/97 (LOC:
                Credit Suisse First Boston, Inc.)                $3,000,000
  1,535,000   Jacksonville Excise Tax Rev.,
                Series B, 4.00%, 10/1/97 (FGIC)                   1,535,829
  1,300,000   Jacksonville Hospital Rev.,
                (Methodist Hospital Project),
                10.50%, 10/1/97, Prerefunded
                at 102% of Par(1)                                 1,353,958
    500,000   Marion County Housing Finance
                Auth. Multi-Family Rev., (Summer
                Trace Apartments), VRDN, 4.00%,
                6/5/97 (LOC: Suntrust Bank,
                Atlanta, GA)                                        500,000
    940,000   Martin County Industrial
                Development Auth. Rev., (R.F.
                Labs, Inc.), VRDN, 4.00%,
                6/4/97 (LOC: Suntrust Bank
                Central Florida, N.A.)                              940,000
    300,000   Martin County Industrial
                Development Auth. Rev., (Tampa
                Farm Service, Inc.), VRDN, 4.00%,
                6/4/97 (LOC: Suntrust Bank
                Central Florida, N.A.)                              300,000
  1,210,000   Monroe County School Board
                Certificates of Participation,
                3.70%, 8/1/97 (AMBAC)                             1,210,000
  1,900,000   Ocean Highway and Port Auth.
                Rev., Series 1990, VRDN, 3.95%,
                6/4/97 (LOC: ABN Amro Bank,
                N.A.)                                             1,900,000
    200,000   Ocean Highway and Port Auth.
                Rev., VRDN, 3.95%, 6/4/97
                (LOC: ABN Amro Bank, N.A.)                          200,000
  1,000,000   Orange County Health Facility
                Auth. Rev., (Adventist Health
                System), VRDN, 3.85%, 6/5/97
                (LOC: Rabobank)                                   1,000,000
  2,000,000   Pasco County School Board
                Certificates of Participation, Series
                1996, VRDN, 3.90%, 6/5/97
                (AMBAC)                                           2,000,000
  2,100,000   Pinellas County Industrial
                Development Rev., (Hunter
                Douglas Project), VRDN, 4.00%,
                6/4/97 (LOC: ABN Amro Bank
                N.V.)                                             2,100,000

See Notes to Financial Statements


Annual Report                               Florida Municipal Money Market     9


                            SCHEDULE OF INVESTMENTS
                         FLORIDA MUNICIPAL MONEY MARKET

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 1,960,000   Putnam County Development Auth.
                Rev., (Seminole Electric), 3.55%,
                9/15/97 (Guaranteed: National
                Rural Utilities Cooperative Finance
                Corp.)                                    $       1,960,000
  3,300,000   Sunshine State Government Finance
                Commercial Paper, 3.65%,
                7/14/97 (LOC: National
                Westminster Bank, Union Bank of
                Switzerland, and Morgan Guaranty
                Trust Co. of New York)                            3,300,000
  3,000,000   Sunshine State Government Finance
                Commercial Paper, 3.85%,
                7/16/97 (LOC: National
                Westminster Bank, Union Bank of
                Switzerland, and Morgan Guaranty
                Trust Co. of New York)                            3,000,000
  1,500,000   Tampa Solid Waste System Rev.,
                4.00%, 10/1/97 (FGIC)                             1,501,392
    900,000   Volusia County Industrial
                Development Auth. Rev., (Daytona
                Plastix Inc.), VRDN, 4.00%,
                6/4/97 (LOC: Suntrust Bank
                Central Florida, N.A.)                              900,000
                                                                -----------
TOTAL INVESTMENT SECURITIES--100.0%                            $111,130,082
                                                                ===========

Notes to Schedule of Investments 
AMBAC = AMBAC Indemnity Corp.
FGIC = Financial Guaranty Insurance Company 
FSA = Financial Security Association
GIC = Guaranteed Investment Contract 
GO = General Obligation 
LOC = Letter of Credit 
SBBPA = Standby Bond Purchase Agreement
VRDN = Variable Rate Demand Note. Interest reset date is indicated and used in
calculating the weighted average portfolio maturity.  Rate shown is effective
May 31, 1997.
(1)  Escrowed in U.S. Government Securities.

See Notes to Financial Statements


10   Florida Municipal Money Market                 American Century Investments

<TABLE>
<CAPTION>
                      FLORIDA INTERMEDIATE-TERM MUNICIPAL


                                             30-Day                  30-Day Tax-Equivalent Yields
                                               SEC           28%           31%           36%           39.6%
                                              Yield      Tax Bracket   Tax Bracket   Tax Bracket    Tax Bracket

YIELDS AS OF MAY 31, 1997
<S>                                           <C>           <C>           <C>           <C>            <C>  
Florida Intermediate-Term Municipal           4.17%         5.79%         6.04%         6.52%          6.90%

                                                                               AVERAGE ANNUAL RETURNS
                                                          6 MONTHS       1 YEAR        3 YEARS     LIFE OF FUND
TOTAL RETURNS AS OF MAY 31, 1997
Florida Intermediate-Term Municipal .....................   1.95%         6.63%         6.08%          6.41%
Lehman 5-Year General Obligation Index ..................   1.28%         6.08%         5.90%          5.93%(2)
Average Florida Intermediate
Municipal Debt Fund(1) ..................................   1.19%         5.75%         5.53%          5.61%(2)
Fund's Ranking Among Florida Intermediate
Municipal Debt Funds(1) .................................    --        2 out of 18   2 out of 14  2 out of 13(2)

(1)  According to Lipper Analytical Services.

(2)  Since  4/30/94,  the date nearest the fund's  inception  for which data are
     available. Inception date was April 11, 1994.
</TABLE>

See pages 28-29 for more information  about returns,  the comparative  index and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER THE LIFE OF THE FUND
Value on 5/31/94

$10,000 investment made 4/30/94

Florida Intermediate-Term Municipal   $12,068
Lehman 5-Year GO Index                $11,945

          Florida Intermediate-Term Municipal      Lehman 5-Year GO Index
Apr-94                 $10,000                            $10,000
May-94                 $10,093                            $10,056
Jun-94                 $10,054                            $10,033
Jul-94                 $10,195                            $10,142
Aug-94                 $10,252                            $10,191
Sep-94                 $10,173                            $10,114
Oct-94                 $10,045                            $10,058
Nov-94                  $9,876                             $9,993
Dec-94                 $10,032                            $10,081
Jan-95                 $10,212                            $10,178
Feb-95                 $10,471                            $10,326
Mar-95                 $10,539                            $10,490
Apr-95                 $10,592                            $10,518
May-95                 $10,830                            $10,749
Jun-95                 $10,811                            $10,757
Jul-95                 $10,930                            $10,908
Aug-95                 $11,021                            $11,018
Sep-95                 $11,069                            $11,051
Oct-95                 $11,195                            $11,097
Nov-95                 $11,297                            $11,192
Dec-95                 $11,386                            $11,253
Jan-96                 $11,513                            $11,387
Feb-96                 $11,481                            $11,349
Mar-96                 $11,328                            $11,288
Apr-96                 $11,310                            $11,271
May-96                 $11,300                            $11,258
Jun-96                 $11,351                            $11,338
Jul-96                 $11,477                            $11,413
Aug-96                 $11,476                            $11,436
Sep-96                 $11,552                            $11,522
Oct-96                 $11,663                            $11,629
Nov-96                 $11,819                            $11,791
Dec-96                 $11,802                            $11,774
Jan-97                 $11,837                            $11,805
Feb-97                 $11,936                            $11,889
Mar-97                 $11,820                            $11,755
Apr-97                 $11,865                            $11,814
May-97                 $12,068                            $11,945

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost. The graph begins on 4/30/94,  the date nearest the fund's 4/11/94
inception date for which index return data are available.

The line representing the fund's total return includes  operating expenses (such
as transaction  costs and management fees) that reduce returns,  while the total
return line of the index does not.

PORTFOLIO AT A GLANCE
                           5/31/97     5/31/96
Number of Securities         34          26
Weighted Average Maturity 7.8 years   7.9 years
Average Duration          5.4 years   5.5 years
Expense Ratio               0.65%      0.13%*

* Until  December 31,  1995,  the fund's  management  fees were waived by Benham
Management Corporation (BMC). As of January 1, 1996, management fees were phased
in at a rate of 0.10% each month until the 0.67% annual expense cap was reached.


Annual Report                           Florida Intermediate-Term Municipal   11


                      FLORIDA INTERMEDIATE-TERM MUNICIPAL

Management Q & A

An interview with senior portfolio manager Dave MacEwen and associate  portfolio
manager Ken Salinger.  Dave and Ken are members of the Florida  municipal  funds
management team.

How did the fund perform?

The fund posted a strong return,  finishing  second in its peer group  category.
For the fiscal  year ended May 31,  1997,  the fund's  total  return was 6.63%+,
strongly  outpacing  the 5.75%  average  return of the 18 "Florida  Intermediate
Municipal  Debt Funds"  tracked by Lipper  Analytical  Services.  (See the Total
Returns table on the previous page for other fund performance comparisons.)

What were some of the reasons behind the fund's strong performance?

One reason was the fund's  portfolio  structure,  which--particularly  in recent
months--was  positioned to take advantage of changing interest rates. By late in
the first quarter,  the yield curve began to flatten as growing  expectations of
an interest  rate  increase by the Federal  Reserve (the Fed) caused  short-term
rates to rise faster than long-term rates.

Once the curve had flattened about as much as we believed likely, we shifted the
fund's portfolio to more of a bulleted  position.  (A bullet structure  clusters
the fund's bond maturities around its average maturity.  This structure tends to
perform best when the yield curve is moving from flat to steep.)  That  strategy
paid off as  expectations  for  another  near-term  rate hike by the Fed largely
dissipated, causing short-term rates to fall and the yield curve to steepen.

Our success in enhancing the fund's  return  through swap trades,  however,  was
probably the main reason behind the fund's strong performance.

What are swap trades and why did you use them?

In a typical swap trade, we exchange one of the fund's  securities with a broker
for one of their  securities that we believe is  undervalued.  There are several
benefits to using swap trades.

One is that  they  allow  the  fund  to  take  advantage  of  occasional  market
inefficiencies  that can create  attractive  buying and  selling  opportunities.
Another  benefit  is that swap  trades  allow us to  quickly  adjust  the fund's
structure.  In  addition,  swap  trades  reduce  the fund's  exposure  to market
risk--

[bar graph - data below]

          Florida Intermediate-Term Municipal      Lehman 5-Year GO Index
5/94*                    0.93                               0.56
5/95                     7.31                               6.89
5/96                     4.34                               4.74
5/97                     6.63                               6.08

This graph  illustrates the fund's returns since its inception and compares them
with the index's returns.  The fund's total returns for the 1996 and 1997 fiscal
years include operating expenses,  while the comparative index's returns do not.
See page 28 for a definition of the index.

* Return from  4/30/94 (the date  nearest the fund's  inception  for which index
data are available) to 5/31/94.

+ Benham Management  Corporation  absorbed 7 basis points of the fund's expenses
during June 1996;  however,  the fund's  ranking would have been the same if the
expenses had not been waived.


12   Florida Intermediate-Term Municipal            American Century Investments


                      FLORIDA INTERMEDIATE-TERM MUNICIPAL

that is, the chance that  interest  rates will change while we are looking for a
replacement  security.  Swapping  also  helped us stay more  fully  invested  in
municipal  securities,  thus  increasing  the fund's  return  over the period by
decreasing the amount of time the fund was forced to hold cash.

How did you manage the fund's duration over the fiscal year?

We kept the fund's duration roughly neutral to its peers,  staying in a range of
5.0-5.7 years.  Within that range,  we shifted the fund's  position  slightly as
conditions  warranted to take advantage of the  relatively  stable nature of the
municipal market during the period.

Securities rated AAA and AA continued to be the fund's staple. Why?

Investors  searching  for higher  yields  continued  to show  strong  demand for
lower-rated municipal securities during the period,  causing the yield advantage
of  lower-rated  municipals to diminish.  In addition,  fairly low levels of new
municipal  security  issuance  caused bond  insurers to lower their  premiums to
capture  more  business.  This  allowed  us to  maintain  a high level of credit
quality for the fund while sacrificing very little yield.

The fund received a large amount of discretionary investment capital from Benham
Management Corporation beginning in April 1997. Why?

We  wanted  to give  fund  investors  the  opportunity  to  monitor  the  fund's
performance in their local newspapers.  To list the fund in the paper, we needed
to bring the fund's assets to over $25  million--the  threshold  required by the
National  Association of Securities Dealers (NASD).  Shareholders will no longer
need to call us to receive share price quotes.

How did you use this large influx of cash?

We used the investment as an  opportunity to shift the fund's  portfolio to more
of a bulleted position.

In addition,  we enhanced the fund's yield by  purchasing  some housing  revenue
municipals.  These types of  securities  are isssued by local and state  housing
authorities  to finance  construction  projects for housing,  plants,  pollution
control  facilities,  or similar  endeavors.  Housing revenue municipals tend to
perform well when interest rates stay within a relatively narrow range.

[pie charts]

PORTFOLIO  COMPOSITION  BY  SECURITY  TYPE (as of  5/31/97)  
Revenue  Bonds  61%
Land-Secured 15% 
GO 13% 
COPs/Leases 8% 
Prerefunded/ETM 1% 
Other 2%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 11/30/96) 
Revenue Bonds 74% 
GO 13%
Tax Allocation 6% 
Prerefunded/ETM 5% 
Other 2%


Annual Report                           Florida Intermediate-Term Municipal   13


                      FLORIDA INTERMEDIATE-TERM MUNICIPAL

What is your outlook for the municipal market over the next six months?

Whether the bond market can sustain the rally begun in early June depends on the
economy,  Federal  Reserve  interest  rate  policy and  inflation.  Our  current
expectation   is  that  economic   growth  will  slow  from  its   unsustainable
first-quarter  pace.  Inflation seems tame, having risen just 2.2% over the last
12 months.  In addition,  "real" short-term  interest rates (nominal  short-term
rates  minus the  inflation  rate) are  already at levels  that  should  inhibit
economic growth. As a result,  we think municipal  securities could rally if the
economy continues to slow.  Nevertheless,  if wage pressures increase, fear of a
Fed rate hike may send municipal bond prices lower.

Another  important  factor  is  the  relative   performance  of  municipals  and
Treasurys.   Lately,   municipal  securities  have  significantly   outperformed
Treasurys, a situation caused in part by relatively low municipal debt issuance.
Although  municipal  issuance should remain fairly light in the near future, the
likelihood  that  municipal  bonds will  continue  to  outperform  Treasurys  is
diminishing--their   prices  are  currently  considered  historically  expensive
relative to Treasurys.  If investor  demand shifts back to Treasurys,  municipal
prices would lose a key support.

With this outlook in mind, what are your plans for the fund going forward?

We plan to  continue  using swap  trades in an  attempt  to  enhance  the fund's
returns.  In  addition,  we will  likely  maintain  the fund's  current  neutral
duration until market conditions call for a different strategy.

We will also  look for what we  believe  are  undervalued  securities  that will
enhance the fund's yield with the help of our credit research team. In addition,
we will  continue  to  monitor  the  relative  performance  of  Treasury  versus
municipal securities.

[pie charts]

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/97)
AAA 63%
AA 37%

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 11/30/96)
AAA 70%
AA 30%


14   Florida Intermediate-Term Municipal            American Century Investments


                            SCHEDULE OF INVESTMENTS
                      FLORIDA INTERMEDIATE-TERM MUNICIPAL

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

MUNICIPAL SECURITIES
$   300,000   Boca Raton Water and Sewer Rev.,
                6.40%, 10/1/02                                   $  314,787
    150,000   Broward County Educational Auth.
                Rev., (Nova Southeastern
                University), 5.40%, 4/1/02
                (Connie Lee)                                        154,289
    300,000   Broward County School District
                GO, 6.75%, 2/15/00                                  317,331
    525,000   Clay County School Board
                Certificates of Participation,
                4.90%, 7/1/03 (MBIA)                                527,856
  1,000,000   Dade County Aviation Rev., Series
                A, (Miami International Airport),
                5.50%, 10/1/02 (FSA)                              1,031,590
    500,000   Dade County Aviation Rev., Series
                E, 5.50%, 10/1/10 (AMBAC)                           510,435
    750,000   Dade County Water and Sewer
                System Rev., 5.125%, 10/1/09
                (FGIC)                                              750,630
    500,000   Duval County School District GO,
                6.25%, 8/1/05 (AMBAC)                               540,270
    500,000   East County Water Control District
                Rev., Series 1994, 5.375%,
                11/1/01 (Asset Guarantee)                           513,510
    300,000   Escambia County Housing Finance
                Auth. Single Family Mortgage
                Rev., 6.00%, 4/1/02                                 308,574
    350,000   Florida Housing Finance Agency
                Multi-Family Housing Rev., 5.35%,
                6/1/00 (Guaranteed)                                 353,766
    450,000   Florida Housing Finance Agency
                Rev., (Williamsburg Village
                Apartments), 5.60%, 12/1/07
                (AMBAC)                                             459,311
    500,000   Florida Housing Finance Agency
                Rev., (Windwood), 5.65%,
                12/1/07 (AXA Insurance)                             508,090
  1,000,000   Florida State Board of Education
                Capital Outlay Rev., 5.00%,
                6/1/04                                            1,015,640
  1,000,000   Florida State Board of Finance
                Department of General Services
                Rev., 5.00%, 7/1/05 (AMBAC)                       1,010,890
    350,000   Gainesville Florida Utilities System
                Rev., Series A, 5.75%, 10/1/09                      370,780

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$   400,000   Hillsborough County Port District
                Special Rev., 6.50%, 6/1/04
                (FSA)                                         $     437,552
    400,000   Indian Trace Community
                Development Auth. Rev., Series
                1995 A, (District Water
                Management), 5.25%, 5/1/03
                (MBIA)                                              410,716
    480,000   Jacksonville Electric Auth. Rev.,
                (St. John's River Power Project),
                6.00%, 10/1/05                                      518,640
    500,000   Jacksonville Electric Auth. Special
                Obligation, 4th Series, (St. John's
                River Power Project), 6.50%,
                10/1/01                                             538,050
    500,000   Jacksonville Excise Tax Rev.,
                5.20%, 10/1/04 (FGIC)                               509,550
    300,000   Lakeland Water and Electric Rev.,
                6.00%, 10/1/07 (FGIC)                               326,364
    550,000   Orange County Health Facilities
                Auth. Rev., Series A, 6.00%,
                10/1/04 (MBIA)                                      588,786
  1,000,000   Orange County School Board
                Certificates of Participation,
                Series A, 4.875%, 8/1/03 (MBIA)                   1,005,760
    450,000   Orlando and Orange County
                Expressway Auth. Rev., 6.50%,
                7/1/11 (FGIC)                                       506,200
    500,000   Orlando Utility Commission Water
                and Electric Rev., 5.70%,
                10/1/04                                             528,305
    300,000   Pensacola Airport Rev., Series A,
                6.00%, 10/1/01 (MBIA)                               305,337
    500,000   Pensacola Airport Rev., Series B,
                5.40%, 10/1/07 (MBIA)                               512,300
    200,000   Reedy Creek Improvement District
                Utility Rev., Series 1991, 6.25%,
                10/1/01, Prerefunded at 101%
                of Par (MBIA)(1)                                    215,078
    400,000   St. Cloud Utility Rev., 6.40%,
                8/1/06 (MBIA)                                       431,956
    175,000   Tampa Palms Community
                Development Special Assessment
                Rev., 4.90%, 5/1/99 (MBIA)                          176,813
    500,000   Volusia County School District GO,
                6.20%, 8/1/03 (FGIC)                                536,595
                                                                 ----------
TOTAL MUNICIPAL SECURITIES--90.5%                                16,235,751
   (Cost $15,928,619)                                            ----------

See Notes to Financial Statements


Annual Report                           Florida Intermediate-Term Municipal   15


                            SCHEDULE OF INVESTMENTS
                      FLORIDA INTERMEDIATE-TERM MUNICIPAL
MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

SHORT-TERM MUNICIPAL SECURITIES
$   600,000   St. Lucie Solid Waste Disposal Rev.,
                (Florida Light & Power Project),
                VRDN, 4.25%, 6/2/97                         $       600,000
  1,100,000   Sunshine State Government
                Finance Commercial Paper,
                3.85%, 7/8/97 (LOC: National
                Westminster Bank, Union Bank
                of Switzerland, and Morgan
                Guaranty Trust Co. of New York)                   1,100,176
                                                                 ----------
TOTAL SHORT-TERM
MUNICIPAL SECURITIES--9.5%                                        1,700,176
   (Cost $1,700,000)                                             ----------
TOTAL INVESTMENT SECURITIES--100.0%                             $17,935,927
   (Cost $17,628,619)                                            ==========

Notes to Schedule of Investments 
AMBAC = AMBAC Indemnity Corp.
FGIC = Financial Guaranty Insurance Company
FSA = Financial Security Association
GO = General Obligation
LOC = Letter of Credit
MBIA = Municipal Bond Insurance Association
VRDN = Variable Rate Demand Note. Interest reset date is indicated and used in
calculating the weighted average portfolio maturity.  Rate shown is effective
May 31, 1997.
(1)  Escrowed in U.S. Government Securities.

See Notes to Financial Statements


16   Florida Intermediate-Term Municipal            American Century Investments

<TABLE>
<CAPTION>
                      STATEMENTS OF ASSETS AND LIABILITIES

MAY 31, 1997

                                                                                     FLORIDA           FLORIDA
                                                                                    MUNICIPAL     INTERMEDIATE-TERM
                                                                                  MONEY MARKET        MUNICIPAL

ASSETS
<S>                                                                                    <C>             <C>    
Investment securities, at value (amortized cost and identified
  cost of $17,628,619, respectively) (Note 3) ................................    $111,130,082     $17,935,927
Cash .........................................................................         587,875              --
Investment in affiliated money market fund (Note 2) ..........................              --         601,610
Interest receivable ..........................................................         533,162         207,088
Prepaid expenses and other assets ............................................           3,760           2,254
                                                                                   -----------      ----------
                                                                                   112,254,879      18,746,879
                                                                                   -----------      ----------

LIABILITIES
Disbursements in excess of demand deposit cash ...............................           1,171         129,029
Payable for investments purchased ............................................              --       2,079,664
Payable for capital shares redeemed ..........................................          47,663          14,754
Payable to affiliates (Note 2) ...............................................          57,931           7,770
Dividends payable ............................................................           3,297           2,000
Accrued expenses and other liabilities .......................................          15,616           1,047
                                                                                   -----------      ----------
                                                                                       125,678       2,234,264
                                                                                   -----------      ----------
Net Assets Applicable to Outstanding Shares ..................................    $112,129,201     $16,512,615
                                                                                  ============     ===========

CAPITAL SHARES
Outstanding (unlimited number of shares authorized) ..........................     112,129,201       1,597,668
                                                                                  ============     ===========
Net Asset Value Per Share ....................................................           $1.00          $10.34
                                                                                  ============     ===========

NET ASSETS CONSIST OF:
Capital paid in ..............................................................    $112,129,201     $16,153,855
Accumulated net realized gain on investments .................................              --          51,452
Net unrealized appreciation on  investments (Note 3) .........................              --         307,308
                                                                                   -----------      ----------
                                                                                  $112,129,201     $16,512,615
                                                                                  ============     ===========
</TABLE>
See Notes to Financial Statements


Annual Report                          Statements of Assets and Liabilities   17

<TABLE>
<CAPTION>
                            STATEMENTS OF OPERATIONS

YEAR ENDED MAY 31, 1997

                                                                                     FLORIDA           FLORIDA
                                                                                    MUNICIPAL     INTERMEDIATE-TERM
                                                                                  MONEY MARKET        MUNICIPAL

INVESTMENT INCOME
Income:
<S>                                                                                <C>                <C>     
Interest ....................................................................      $4,751,569         $587,727
                                                                                   ----------         --------

Expenses (Note 2):
Investment advisory fees ....................................................         565,080           48,457
Administrative fees .........................................................         124,867           10,678
Transfer agency fees ........................................................          42,747           10,178
Printing and postage ........................................................          38,276            7,417
Custodian fees ..............................................................          34,638            6,641
Auditing and legal fees .....................................................          31,431            5,773
Telephone expenses ..........................................................           9,910              460
Registration and filing fees ................................................           7,414            1,564
Trustees' fees and expenses .................................................           5,690              557
Organizational expenses .....................................................           1,316            1,174
Other operating expenses ....................................................          11,146            7,304
                                                                                   ----------         --------
  Total expenses ............................................................         872,515          100,203
Amount waived ...............................................................        (711,288)         (24,856)
                                                                                   ----------         --------
  Net expenses ..............................................................         161,227           75,347
                                                                                   ----------         --------
Net investment income .......................................................       4,590,342          512,380
                                                                                   ----------         --------

REALIZED AND UNREALIZED GAIN
ON INVESTMENTS (NOTE 3)
Net realized gain on investments ............................................              --           51,857
Change in net unrealized appreciation on investments ........................              --          177,601
                                                                                   ----------         --------

Net realized and unrealized
gain on investments .........................................................              --          229,458
                                                                                   ----------         --------
Net Increase in Net Assets
Resulting from Operations ...................................................      $4,590,342         $741,838
                                                                                   ==========         ========

See Notes to Financial Statements
</TABLE>


18   Statements of Operations                       American Century Investments

<TABLE>
<CAPTION>
                      STATEMENTS OF CHANGES IN NET ASSETS

YEARS ENDED MAY 31, 1997
AND MAY 31, 1996

                                                                  FLORIDA                       FLORIDA
                                                                 MUNICIPAL                 INTERMEDIATE-TERM
                                                               MONEY MARKET                    MUNICIPAL

Increase in Net Assets                                   1997            1996             1997           1996
OPERATIONS
<S>                                                 <C>              <C>           <C>            <C>         
Net investment income ............................  $   4,590,342    $ 2,956,034   $     512,380  $    532,966
Net realized gain on investments .................             --             --          51,857        60,069
Change in net unrealized appreciation
  (depreciation) on investments ..................             --             --         177,601      (154,774)
                                                        ---------      ---------         -------       -------
Net increase in net assets resulting
  from operations ................................      4,590,342      2,956,034         741,838       438,261
                                                        ---------      ---------         -------       -------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income .......................     (4,590,342)    (2,956,034)       (512,380)     (532,966)
From net realized gains from
  investment transactions ........................            --              --         (39,475)      (43,635)
                                                        ---------      ---------         -------       -------
Decrease in net assets from distributions ........     (4,590,342)    (2,956,034)       (551,855)     (576,601)
                                                        ---------      ---------         -------       -------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ........................    211,673,148    196,163,359      14,609,503     7,316,860
Proceeds from reinvestment of distributions ......      4,249,244      2,887,312         409,403       403,119
Payments for shares redeemed .....................   (203,786,255)  (144,204,430)     (9,015,107)   (6,794,465)
                                                     ------------   ------------      ----------    ---------- 
Net increase in net assets from
  capital share transactions .....................     12,136,137     54,846,241       6,003,799       925,514
                                                       ----------     ----------       ---------       -------
Net increase in net assets .......................     12,136,137     54,846,241       6,193,782       787,174

NET ASSETS
Beginning of year ................................     99,993,064     45,146,823      10,318,833     9,531,659
                                                       ----------     ----------      ----------     ---------
End of year ......................................   $112,129,201    $99,993,064     $16,512,615    $10,318,833
                                                     ============    ===========     ===========    ===========

TRANSACTIONS IN SHARES OF THE FUNDS
Sold .............................................    211,673,148    196,163,359       1,420,596       703,119
Issued in reinvestment of distributions ..........      4,249,244      2,887,312          39,811        38,875
Redeemed .........................................   (203,786,255)  (144,204,430)       (876,033)     (654,017)
                                                     ------------   ------------        --------      -------- 
Net increase .....................................     12,136,137     54,846,241         584,374        87,977
                                                       ==========     ==========         =======        ======
</TABLE>
See Notes to Financial Statements


Annual Report                           Statements of Changes in Net Assets   19


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997

1. Organization and Summary of Significant Accounting Policies

Organization--American  Century  Municipal Trust (the Trust) is registered under
the Investment Company Act of 1940 as an open-end management investment company.
American  Century - Benham  Florida  Municipal  Money Market Fund (Money  Market
Fund) and American  Century - Benham  Florida  Intermediate-Term  Municipal Fund
(Intermediate-Term  Fund)  (the  Funds)  are two of the six Funds  issued by the
Trust.  The Funds are  non-diversified  under  the 1940  Act.  Their  investment
objective  is to seek as high a level of  current  income  exempt  from  federal
income  taxes  as  is  consistent   with  prudent   investment   management  and
conservation of shareholders'  capital.  The Money Market Fund invests primarily
in short-term  Florida  municipal  obligations and maintains a weighted  average
maturity of 90 days or less.  The  Intermediate-Term  Fund invests  primarily in
intermediate-term Florida municipal obligations and maintains a weighted average
maturity from five to ten years. The Funds  concentrate  their  investments in a
single state and  therefore may have more exposure to credit risk related to the
state of Florida than a fund with a broader  geographical  diversification.  The
following  significant   accounting  policies  relating  to  the  Funds  are  in
accordance with accounting policies generally accepted in the investment company
industry.

Security  Valuations--Securities  held by the Money  Market  Fund are  valued at
amortized cost, which approximates current market value.  Securities held by the
Intermediate-Term  Fund are valued through valuations obtained from a commercial
pricing  service or at the mean of the most  recent bid and asked  prices.  When
valuations  are not readily  available,  securities  are valued at fair value as
determined in accordance with procedures adopted by the Board of Trustees.

Security  Transactions--Security  transactions  are  accounted  for on the  date
purchased  or  sold.  Net  realized  gains  and  losses  are  determined  on the
identified cost basis, which is also used for federal income tax purposes.

Investment Income--Interest income is recorded on the accrual basis and includes
amortization  of discounts and premiums.  Premiums and original issue  discounts
are  amortized   daily  using  the  effective   interest  rate  method  for  the
Intermediate-Term  Fund. Market discounts are recognized as income upon the sale
or maturity of securities for the Intermediate-Term Fund. Premiums and discounts
are amortized  daily on a  straight-line  basis for securities held by the Money
Market Fund.

Income Tax  Status--It  is the Funds' policy to  distribute  all net  investment
income and net realized capital gains to shareholders  and to otherwise  qualify
as a regulated  investment  company under the provisions of the Internal Revenue
Code. Accordingly, no provision has been made for federal or state taxes.

Distributions to Shareholders--Distributions  from net investment income for the
Intermediate-Term Fund are declared daily and distributed monthly. Distributions
from net  realized  gains for the  Intermediate-Term  Fund are declared and paid
annually.  The Money Market Fund's  distributions from net investment income are
declared and credited daily and distributed  monthly. The Money Market Fund does
not expect to realize any long-term  capital gains,  and  accordingly,  does not
expect to pay any capital gain  distributions.  For the year ended May 31, 1997,
100% of the Funds' distributions from net investment income have been designated
as exempt from federal income taxes.

The character of distributions  made during the year from net investment  income
or net  realized  gains may differ  from  their  ultimate  characterization  for
federal income tax purposes due to differences in the  recognition of income and
expense items for financial statement and tax purposes.

Supplementary  Information--Certain  officers and trustees of the Trust are also
officers and/or directors, and, as a group, controlling stockholders of American
Century  Companies,  Inc. (ACC), the parent of the Trust's  investment  manager,
Benham Management  Corporation (BMC), the Trust's distributor,  American Century
Investment  Services,  Inc.  (ACIS),  and the Trust's  transfer agent,  American
Century Services Corporation (ACSC).

Futures  Contracts--The  Intermediate-Term  Fund may buy and sell  interest rate
futures  contracts  relating to debt  securities  and write and buy put and call
options  relating to interest rate futures  contracts.  The Fund may use futures
and options  transactions  to  maintain  cash  reserves  while  remaining  fully
invested,  to facilitate  trading,  to reduce  transaction  costs,  or to pursue
higher  investment  returns when a futures contract is priced more  attractively
than its underlying security or index. One of the risks of entering into futures
may include the  possibility  that the changes in value of the  contract may not
correlate with the changes in value of the underlying securities.  Upon entering
into a  futures  contract,  the  Fund is  required  to  deposit  either  cash or
securities  in an amount equal to a certain  percentage  of the  contract  value
(initial margin).  Subsequent  payments  (variation margin) are made or received
daily, in cash, by the Fund. The variation margin is


20   Notes to Financial Statements                  American Century Investments


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997

equal to the daily change in the contract value and is recorded as an unrealized
gain or loss.  The Fund  recognizes a realized gain or loss when the contract is
closed or expires. There were no open futures contracts at May 31, 1997.

Use of  Estimates--The  preparation of financial  statements in conformity  with
generally accepted  accounting  principles requires management to make estimates
and assumptions  that affect the reported  amounts of assets and liabilities and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements  and the reported  amounts of increases  and  decreases in net assets
from  operations  during the  period.  Actual  results  could  differ from these
estimates.

- --------------------------------------------------------------------------------
2. Transactions with Related Parties

The  Trust has  entered  into an  Investment  Advisory  Agreement  with BMC that
provides  the  Trust  with  investment  advisory  services  in  exchange  for an
investment  advisory  fee.  ACSC pays all  compensation  of Trust  officers  and
trustees who are officers or  directors  of ACC or any of its  subsidiaries.  In
addition,  promotion and  distribution  expenses are paid by BMC. The investment
advisory  fee is paid  monthly  by each Fund  based on its pro rata share of the
dollar amount derived from applying the Trust's average daily closing net assets
to the following annualized investment advisory fee schedule.

          0.50% of the first $100 million 
          0.45% of the next $100 million 
          0.40% of the next $100 million  
          0.35% of the next $100 million     
          0.30% of the next $100 million  
          0.25% of the next $1 billion 
          0.24% of the next $1 billion
          0.23% of the next $1 billion  
          0.22% of the next $1 billion 
          0.21% of the next $1 billion 
          0.20% of the next $1 billion
          0.19% of average daily net assets over $6.5 billion

The Trust has an  Administrative  Services and Transfer  Agency  Agreement  with
ACSC. Under the Agreement,  ACSC provides  substantially all  administrative and
transfer agency services necessary to operate the Funds. Fees for these services
are based on  transaction  volume,  number of accounts and average daily closing
net assets for funds advised by BMC.

The Trust has an additional agreement with BMC pursuant to which BMC established
a contractual  expense guarantee that limits Fund expenses (excluding items such
as brokerage  commissions,  taxes,  interest,  custodian  earnings credits,  and
extraordinary  expenses)  to 0.61% of average  daily  closing net assets for the
Money  Market  Fund and  0.67% for the  Intermediate-Term  Fund.  The  agreement
provides that BMC may recover  amounts  (representing  expenses in excess of the
Fund's expense guarantee rate) absorbed during the preceding 11 months,  if, and
to the extent that, for any given month,  the Fund's  expenses are less than the
expense guarantee rate in effect at that time. BMC voluntarily  agreed to absorb
all  expenses of the Money Market Fund  through  December  31, 1996.  In January
1997, the Money Market Fund began adding  expenses at a rate of 0.10% of average
daily  closing net assets per month and will  continue  to add  expenses at this
rate until the contractual expense rate of 0.61% is reached.

The payables to  affiliates as of May 31, 1997,  based on the above  agreements,
were as follows:

                                           Intermediate-
                             Money Market      Term
Investment Advisor .........    $34,908       $4,669
Administrative Services and
  Transfer Agent ...........     23,023)       3,101
                              ---------     --------
                                $57,931       $7,770
                              =========     ========

As of May 31, 1997,  Intermediate-Term  had  invested  $601,610 in shares of the
Money Market Fund. The terms of such  transactions  were identical to those with
non-related  entities except that, to avoid duplicate  investment  advisory fees
and administrative fees,  Intermediate-Term  did not pay BMC investment advisory
fees and ACSC  administrative  fees with respect to assets invested in shares of
the Money Market Fund.

On April 25, 1997, the Board of Trustees  approved a plan to implement a unified
management fee, which would replace the existing contracts between the Funds and
related parties.  Such plan is subject to shareholder approval and will be voted
on in July,  1997.  Results of the vote were unknown at the time this report was
printed.

The Trust  has a  Distribution  Agreement  with ACIS  which is  responsible  for
promoting sales of and distributing the Trust's shares.


Annual Report                                 Notes to Financial Statements   21


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997

- --------------------------------------------------------------------------------
3. Investment Transactions

Purchases and sales of securities  (excluding  short-term  investments)  for the
year ended May 31, 1997, for the Intermediate-Term  Fund totaled $15,343,297 and
$9,268,472, respectively.

As  of  May  31,  1997,   accumulated  net  unrealized   appreciation   for  the
Intermediate-Term  Fund was $307,308,  consisting of unrealized  appreciation of
$312,718,  and  unrealized   depreciation  of  $5,410.  The  aggregate  cost  of
investments  for  federal  income  tax  purposes  was the  same as the  cost for
financial reporting purposes.


22   Notes to Financial Statements                  American Century Investments

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS
                         FLORIDA MUNICIPAL MONEY MARKET

     For a Share Outstanding Throughout the Years Ended May 31 (except as noted)

                                                                 1997         1996         1995         1994(1)

PER-SHARE DATA
<S>                                                              <C>         <C>          <C>           <C>  
Net Asset Value, Beginning of Period ..........................  $1.00       $1.00        $1.00         $1.00
                                                                 -----       -----        -----         -----
Income From Investment Operations
  Net Investment Income .......................................   0.03        0.04         0.04         --
                                                                 -----       -----        -----         -----
Distributions
  From Net Investment Income ..................................  (0.03)      (0.04)       (0.04)        --
                                                                 -----       -----        -----         -----
Net Asset Value, End of Period ................................  $1.00       $1.00        $1.00         $1.00
                                                                 =====       =====        =====         =====
  Total Return(2) .............................................   3.55%       3.86%        3.71%         0.40%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets(3) ......................................   0.12%       0.01%         --          --
Ratio of Operating Expenses to Average
Net Assets (Before Expense Waiver)(3) .........................   0.66%       0.71%        0.88%      1.58%(4)
Ratio of Net Investment
Income to Average Net Assets ..................................   3.48%       3.75%        3.93%      2.99%(4)
Ratio of Net Investment Income to Average
Net Assets (Before Expense Waiver) ............................   2.94%       3.05%        3.05%      1.41%(4)
Net Assets, End of Period (in thousands) .....................$112,129      $99,993      $45,147        $5,565

(1)  April 11, 1994 (incepton) through May 31, 1994.

(2)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any. Total returns for periods less than one year are not
     annualized.

(3)  The ratios for the periods  subsequent  to May 31, 1995,  include  expenses
     paid through expense offset arrangements.

(4)  Annualized.
</TABLE>

See Notes to Financial Statements


Annual Report                                          Financial Highlights   23

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS
                      FLORIDA INTERMEDIATE-TERM MUNICIPAL

     For a Share Outstanding Throughout the Years Ended May 31 (except as noted)

                                                                 1997         1996         1995         1994(1)

PER-SHARE DATA
<S>                                                            <C>           <C>          <C>          <C>   
Net Asset Value, Beginning of Period .......................   $10.18        $10.30       $10.11       $10.00
                                                               ------        ------       ------       ------
Income From Investment Operations
  Net Investment Income ....................................     0.46          0.52         0.52         0.07
  Net Realized and Unrealized Gain (Loss)
  on Investment Transactions ...............................     0.20         (0.08)        0.19         0.11
                                                                 ----         -----         ----         ----
  Total From Investment Operations .........................     0.66          0.44         0.71         0.18
                                                                 ----          ----         ----         ----
Distributions
  From Net Investment Income ...............................    (0.46)        (0.52)       (0.52)       (0.07)
  From Net Realized Capital Gains ..........................    (0.04)        (0.04)       --           --
                                                                 ----          ----         ----         ----
  Total Distributions ......................................    (0.50)        (0.56)       (0.52)       (0.07)
                                                                -----         -----        -----        ----- 
Net Asset Value, End of Period .............................   $10.34        $10.18       $10.30       $10.11
                                                               ======        ======       ======       ======
  Total Return(2) ..........................................     6.63%         4.34%        7.31%        1.79%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ......................................     0.65%        0.13%        --           --
Ratio of Operating Expenses to Average
Net Assets (Before Expense Waiver) .........................     0.86%        0.88%         1.09%     1.92%(3)
Ratio of Net Investment
Income to Average Net Assets ...............................     4.42%        5.05%         5.23%     5.02%(3)
Ratio of Net Investment Income to
Average Net Assets (Before Expense Waiver) .................     4.21%        4.30%         4.14%     3.10%(3)
Portfolio Turnover Rate ....................................       82%          66%           37%           6%
Net Assets, End of Period (in thousands) ...................  $16,513       $10,319        $9,532       $5,892

(1)  April 11, 1994 (inception) through May 31, 1994.

(2)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any. Total returns for periods less than one year are not
     annualized.

(3)  Annualized.
</TABLE>

See Notes to Financial Statements


24   Financial Highlights                           American Century Investments


                          INDEPENDENT AUDITORS' REPORT

The Board of Trustees and Shareholders
American Century Municipal Trust:

We have audited the accompanying statements of assets and liabilities, including
the schedules of investment  securities,  of American  Century - Benham  Florida
Municipal   Money   Market   Fund  and   American   Century  -  Benham   Florida
Intermediate-Term  Municipal Fund (two of the series comprising American Century
Municipal  Trust) (the Funds) as of May 31, 1997 and the related  statements  of
operations for the year then ended,  the statements of changes in net assets for
the two years then ended,  and the financial  highlights for each of the periods
presented.   These  financial   statements  and  financial  highlights  are  the
responsibility  of the Funds'  management.  Our  responsibility is to express an
opinion on these  financial  statements  and financial  highlights  based on our
audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about whether the financial  statements and the financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  Our procedures included  confirmation of securities owned as of May
31, 1997,  by  correspondence  with the  custodian  and  brokers.  An audit also
includes assessing the accounting principles used and significant estimates made
by  management,   as  well  as  evaluating  the  overall   financial   statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  the financial  statements and the financial highlights referred
to above present fairly, in all material respects, the financial position of the
Funds as of May 31, 1997, the results of their operations,  the changes in their
net assets and the financial  highlights  for the periods  indicated  above,  in
conformity with generally accepted accounting principles.

/s/KPMG Peat Marwick LLP 
KPMG Peat Marwick LLP 

Kansas City, Missouri
July 7, 1997


Annual Report                                  Independent Auditors' Report   25


                                     NOTES

26   Notes                                          American Century Investments


                                     NOTES

Annual Report                                                         Notes   27


                             BACKGROUND INFORMATION

Investment Philosophy & Policies

The Benham Group offers 42 fixed-income  funds,  ranging from money market funds
to long-term bond funds and including both taxable and tax-exempt funds.

The Florida  municipal funds seek to provide interest income exempt from federal
income taxes by investing at least 65% of their net assets in Florida  municipal
securities.  Fund shares are intended to be exempt from the Florida  intangibles
tax.

Florida  Municipal Money Market seeks interest income exempt from federal income
taxes. The fund invests primarily in high-quality,  short-term Florida municipal
securities.  Investments in Florida  Municipal  Money Market are neither insured
nor guaranteed by the U.S. government.  Yields will fluctuate,  and there can be
no assurance  that the fund will be able to maintain a stable net asset value of
$1 per share.

Florida  Intermediate-Term  Municipal is a variable-price bond fund that invests
primarily in  intermediate-term  Florida municipal securities with maturities of
four or more  years.  The fund  maintains  a weighted  average  maturity of 5-10
years.

Comparative Indices

The index listed below is used in the report as a fund  performance  comparison.
It is not an investment product available for purchase.

The Lehman 5-Year Municipal  General  Obligation Index is a municipal bond index
composed of more than 11,000  bonds with  maturities  of four to six years.  The
bonds are rated BBB or higher by  Standard & Poor's,  with an average  rating of
AA. The average maturity of the index is five years.

Lipper Rankings

Lipper Analytical Services,  Inc. is an independent mutual fund ranking service.
Rankings are based on average  annual  returns for each fund in a given category
for the periods  indicated.  Rankings are not included for periods less than one
year.

The Lipper categories for the Florida Municipal funds are:

Other  States   Tax-Exempt   Money  Market  Funds   (Florida   Municipal   Money
Market)--funds   that  invest  in  high  quality   municipal   obligations  with
dollar-weighted average maturities of less than 90 days.

Florida   Intermediate   Municipal   Debt   Funds   (Florida   Intermediate-Term
Municipal)--funds  that invest at least 65% of their  assets in  municipal  debt
issues that are exempt from taxation in Florida,  with  dollar-weighted  average
maturities of 5-10 years.

PORTFOLIO MANAGEMENT TEAM
Senior Municipal
Portfolio Manager                   Dave MacEwen
Municipal Portfolio Manager         Bryan Karcher
Associate Municipal
Portfolio Manager                   Ken Salinger
Municipal Credit Research Manager   Steven Permut
Credit Analysts                     Scott Lord, Bill McClintock,
                                    David Moore, Tim Benham


28   Background Information                         American Century Investments


                                    GLOSSARY

Returns

o Total  Return  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

o Average Annual Returns  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on pages 23-24.

Yields

o 7-Day  Current  Yield  is  calculated  based  on the  income  generated  by an
investment  in the fund over a seven-day  period and is  expressed  as an annual
percentage rate.

o 7-Day  Effective  Yield is  calculated  similarly,  although  this  figure  is
slightly  higher than the fund's 7-Day  Current  Yield because of the effects of
compounding.  The 7-Day  Effective  Yield  assumes  that income  earned from the
fund's investments is reinvested and generating additional income.

o 30-Day SEC Yield  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annualized  percentage  rate based on the fund's
share price at the end of the 30-day period. The SEC yield should be regarded as
an estimate  of the fund's  investment  income,  and it may not equal the fund's
actual income distribution rate, the income paid to a shareholder's  account, or
the income reported in the fund's financial statements.

o  Tax-Equivalent  Yields show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

Investment Terms

o Basis Point--a basis point equals one  one-hundredth of a percentage point (or
0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

o Yield Curve--a graphic representation of the relationship between maturity and
yield  for  fixed-income   securities.   Yield  curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

Portfolio Statistics

o Number of Securities--the  number of different  securities held by a fund on a
given date.

o  Weighted  Average  Maturity  (WAM)--a  measurement  of the  sensitivity  of a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio mature, weighted by dollar amount.

o  Average  Duration--another  measure  of  the  sensitivity  of a  fixed-income
portfolio to interest rate changes.  Duration is a time-weighted  average of the
interest and principal payments of the securities in a portfolio.

o Expense Ratio--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

Types of Municipal Securities

o  COPs/Leases--securities  issued to finance public property improvements (such
as city halls and police  stations) and  equipment  purchases.  Certificates  of
participation  represent long-term debt obligations,  while leases have a higher
risk profile than GOs because they require annual appropriation.

o GO  Bonds--general  obligation  securities  backed by the taxing  power of the
issuer.

o  Land-Secured  Bonds--securities  such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.

o Prerefunded Bonds/ETM Bonds--securities  refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

o  Revenue  Bonds--securities  backed by  revenues  from  sales  taxes or from a
specific  project,  system or facility (such as a hospital,  electric utility or
water system).


Annual Report                                                      Glossary   29

[american century logo]
American
Century(sm)

P.O. Box 419200
Kansas City, Missouri
64141-6200

Investor Services:
1-800-345-2021 or 816-531-5575

Automated Information Line:
1-800-345-8765

Telecommunications Device for the Deaf:
1-800-634-4113 or 816-444-3485

Fax: 816-340-7962

Internet: www.americancentury.com


AMERICAN CENTURY MUNICIPAL TRUST

Investment Manager
Benham Management Corporation


This  report and the  statements  it  contains  are  submitted  for the  general
information of our  shareholders.  The report is not authorized for distribution
to  prospective  investors  unless  preceded  or  accompanied  by  an  effective
prospectus.

American Century Investment Services, Inc.


9707           [recycled logo]
SH-BKT-9001        Recycled
<PAGE>
                                 ANNUAL REPORT

                            [american century logo]

                                  May 31, 1997

                                     BENHAM
                                      GROUP

                       Arizona Intermediate-Term Municipal

[front cover]

                                TABLE OF CONTENTS
Report Highlights........................................... 1
Our Message to You.......................................... 2
Period Overview............................................. 3
Arizona Municipal Credit Review............................. 4
Performance & Portfolio Information......................... 5
Management Q & A............................................ 6
Schedule of Investments..................................... 8
Statement of Assets and Liabilities.........................10
Statement of Operations.....................................11
Statements of Changes in Net Assets.........................12
Notes to Financial Statements...............................13
Financial Highlights........................................15
Independent Auditors' Report................................16
Background Information
   Investment Philosophy & Policies.........................20
   Comparative Indices......................................20
   Lipper Rankings..........................................20
   Portfolio Management Team................................20
Glossary....................................................21

American Century  Investments offers you nearly 70 fund choices covering stocks,
bonds, money markets,  specialty investments and blended portfolios. To help you
find the funds that may meet your needs, we have divided  American Century funds
into three groups based on investment style and objectives.  These groups, which
appear below, are designed to help simplify your fund decisions.

                  American Century Investments--Family of Funds

     BENHAM GROUP           AMERICAN CENTURY GROUP       TWENTIETH CENTURY GROUP

  MONEY MARKET FUNDS          ASSET ALLOCATION &
 GOVERNMENT BOND FUNDS          BALANCED FUNDS              U.S. GROWTH FUNDS
DIVERSIFIED BOND FUNDS     CONSERVATIVE EQUITY FUNDS       INTERNATIONAL FUNDS
 MUNICIPAL BOND FUNDS           SPECIALTY FUNDS
        Arizona
Intermediate-Term Municipal

We welcome your comments or questions about this report.  
See the back cover for ways to contact us by mail, phone or e-mail.

Twentieth  Century and the Benham Group are registered marks of American Century
Services Corporation and Benham Management Corporation,  respectively.  American
Century is a service mark of American Century Services Corporation.


                                                    American Century Investments


                               REPORT HIGHLIGHTS
Period Overview

o  The U.S. economy grew at a healthy clip during the fiscal year ended May
31, 1997, while inflation remained relatively subdued.

o The Federal Reserve raised short-term  interest rates in late March--the first
increase since February 1995--in an effort to keep inflation from accelerating.

o  Municipal  bonds  posted  strong  returns  despite  shifting   interest  rate
expectations.

o  Relatively low levels of new municipal issuance should continue to support
prices for the near future.

Arizona Municipal Credit Review

o Strong economic growth improved  Arizona  municipal  credit quality during the
fiscal year.

o Arizona's  healthy economy  translated into increased retail sales,  which has
boosted the state's tax revenues.

o As we  anticipated,  Maricopa  County's  credit rating was upgraded by several
independent rating agencies.

o  Going forward, we expect Arizona municipal credit quality to remain stable
and strong, but we will continue to monitor potential credit threats, such as
the state's rising inflation levels.

Arizona Intermediate-Term Municipal

o The fund produced  strong returns for the fiscal year despite  shifting market
expectations.

o We kept the fund's  duration  conservatively  positioned,  making  only slight
adjustments as conditions warranted.

o Going  forward,  we will focus more  strongly  on the  difference  between the
yields of shorter- and longer-term municipals.

o With  the help of our  credit  research  team,  we will  continue  to look for
undervalued securities that we believe have the chance to appreciate.

                             ARIZONA INTERMEDIATE-
                                 TERM MUNICIPAL

                          TOTAL RETURNS:  AS OF 5/31/97
                             6 Months            0.94%*
                             1 Year               5.77%

                          NET ASSETS:     $30.6 million
                             (AS of 5/31/97)

                          INCEPTION DATE:       4/11/94

                          TICKER SYMBOL:          BEAMX

                          * Not annualized.

                 Many of the investment terms in this report are
                       defined in the Glossary on page 21.


Annual Report                                             Report Highlights    1


                               OUR MESSAGE TO YOU

[photo of James E. Stowers III and James M. Benham]

During  the fiscal  year ended May 31,  1997,  investors  in the Benham  Arizona
Intermediate-Term fund earned solid, competitive returns as municipal securities
outperformed  Treasurys for much of the period.  The extended economic expansion
that  propelled  U.S.  stock markets to new highs also  benefited  municipal and
corporate bonds, and low levels of inflation provided bond investors with higher
real  rates of  return.  In  Arizona,  surging  retail  sales and low  levels of
unemployment  boosted  tax  revenues  for local  governments,  leading to credit
quality upgrades.

American  Century's  municipal bond  management  team is well positioned to take
advantage  of  attractive  opportunities  in  the  municipal  markets.  We  have
continued to expand our very talented team of municipal  credit  analysts,  most
recently  adding  David  Moore,  who comes to us from  Keystone  Investments  in
Boston.  The  credit  team  contributed  significantly  to our  ability  to find
undervalued municipal securities that ultimately enhanced fund returns.

We also strengthened our corporate team. In June, Bill Lyons, American Century's
chief operating officer,  was named president,  assuming full responsibility for
the company's day-to-day  operations.  This change will allow Jim Stowers III to
focus more time on developing and refining new investment technologies and tools
that build on and leverage the proprietary  system his father pioneered 25 years
ago.   One  of  our  goals  is  to  ensure   that  we  continue  to  evolve  and
innovate--building  the  investment  tools  today that will help lead us and our
investors to success in the next century.

We appreciate your confidence in American Century and look forward to continuing
to serve you.

/s/James E. Stowers III                     /s/James M. Benham
James E. Stowers III                        James M. Benham
President and Chief Executive Officer       Vice Chairman
American Century Companies                  American Century Companies


2    Our Message to You                             American Century Investments


                                PERIOD OVERVIEW
U.S. Economy

The U.S. economy grew at a healthy pace during the 12 months ended May 31, 1997.
After  expanding  at a 2.2% annual rate in the third  quarter of 1996,  the U.S.
economy surged ahead at an impressive 3.8% rate in the fourth quarter.  Economic
growth hit a ten-year high of 5.9% in the first quarter of 1997.  Fueling robust
growth were strong  consumer  spending  and rising  consumer  confidence,  which
reached a 28-year high in April. In addition,  the  unemployment  rate fell from
5.4% in January to a 23-year low of 4.8% in May.

Inflation--as  measured by the  government's  consumer  price  index--rose  at a
modest 1.4%  annual  rate  during the first five months of 1997.  That stands in
sharp contrast to 1996, when prices rose by 3.6% --the largest yearly gain since
1990.

Concerned  that vigorous  economic  growth might lead to higher  inflation,  the
Federal Reserve (the Fed) raised  short-term  interest rates in March--the first
such increase since  February 1995.  Though the Fed held rates steady at its May
interest  rate  policy  meeting,  tight labor  markets and strong  manufacturing
activity have kept market participants from ruling out another rate hike.

Municipal Bond Market

Municipal  bonds produced  strong  returns as interest  rates  declined  overall
during the 12-month period.  Longer-term  securities,  which usually  appreciate
more than short-term securities when rates fall, performed best. For the period,
the Lehman Long-Term  Municipal Bond Index rose by 10.04%.  The Lehman Five-Year
General Obligation Index rose by 6.09%.

Bond yields fluctuated throughout the period. Yields were at their highest point
at the beginning of the period,  when strong job growth led many to believe that
the Fed was  poised to raise  rates.  However,  expectations  for  higher  rates
softened  after  economic  growth  moderated  in the third  quarter  and the Fed
continued to hold interest  rates steady.  Aided by strong demand from insurance
companies,   municipal  bond  prices  rallied  and  yields  fell.  By  December,
short-term  municipal  yields had fallen  nearly 60 basis points from where they
began the period,  while long-term  municipal yields were nearly 70 basis points
lower.

Interest  rates  rose  near  the end of the  first  quarter  of 1997 as signs of
stronger-than-expected  economic  growth  resurrected  fears  that the Fed would
raise rates to keep inflation in check. As a result,  municipal bond yields rose
steadily through April.

Recent data  suggest that the rate of U.S.  economic  growth  slowed  during the
second  quarter,  fueling a municipal  market  rally in May and June.  Municipal
bonds are also  benefiting  from  relatively  low levels of new  municipal  debt
issuance. Although demand from retail investors has tapered off recently, retail
demand was strong  during much of the fiscal year.  Any renewed  surge in demand
would support bond prices and dampen market volatility.

[line graph]

MUNICIPAL YIELD CURVES

Years to Maturity       5/31/96          5/31/97
1                        3.800            3.850
2                        4.150            4.150
3                        4.370            4.350
4                        4.520            4.500
5                        4.640            4.600
6                        4.740            4.660
7                        4.840            4.720
8                        4.940            4.780
9                        5.040            4.840
10                       5.140            4.900
11                       5.230            4.976
12                       5.320            5.052
13                       5.410            5.128
14                       5.500            5.204
15                       5.590            5.280
16                       5.624            5.308
17                       5.658            5.336
18                       5.692            5.364
19                       5.726            5.392
20                       5.760            5.420
21                       5.768            5.426
22                       5.776            5.432
23                       5.784            5.438
24                       5.792            5.444
25                       5.800            5.450
26                       5.804            5.454
27                       5.808            5.458
28                       5.812            5.462
29                       5.816            5.466
30                       5.820            5.470
Source: Bloomberg Financial Markets


Annual Report                                               Period Overview    3


                        ARIZONA MUNICIPAL CREDIT REVIEW

Strong economic growth improved  Arizona  municipal credit quality during the 12
months ended May 31, 1997. As we  anticipated,  Maricopa  County's credit rating
was upgraded by several  independent  rating agencies during the period.  Though
the pace of economic  growth  slowed  slightly  in early  1997,  Arizona was the
second fastest growing state in the nation during 1996.

As the accompanying  graph indicates,  Arizona's  economy  supported  impressive
rates of job growth. The state unemployment rate fell to 4.9% during March 1997,
compared  with a national rate of 5.2% for the same period.  Labor-force  growth
has been most impressive in Phoenix and Tucson,  where March  unemployment rates
were 3.4% and 3.5%, respectively.

The state's population  expanded rapidly during the period, with growth forecast
to remain strong through 2005.  Arizona's  growth has been fueled by immigration
from  neighboring  high-cost  states,  attracting  companies  and  workers  from
California  in  particular.  In addition,  retirees  continue to be drawn by the
state's  desirable  climate and quality of life.  The rapid  growth of Arizona's
population and  employment has been mirrored by the growth of personal  incomes,
which expanded by 8.8% during 1996.

The  combination  of strong  economic and  population  growth buoyed the state's
construction  sector.  Though total building permit  issuance  remains at a high
annual level,  residential  permit issuance actually tapered off during 1996 and
1997 (see the accompanying graph). Nevertheless, commercial construction remains
strong and should support the sector for the near future.

Despite the recent  expansion of the state's high  technology,  construction and
retail sectors,  tourism remains a vital component of Arizona's economy.  Nearly
24 million tourists are estimated to have visited Arizona in 1996.

Arizona's  healthy economy  translated  into increased  retail sales in 1996 and
similar trends  continue thus far in 1997. The steady  increase in taxable sales
has been good for the state's budget--general fund tax revenues are up almost 8%
on a year-over-year basis in fiscal 1997.

Going forward,  we expect Arizona  municipal credit quality to remain stable and
strong. Nevertheless, we continue to monitor potentially negative credit trends.
Inflation  is  rising  in  Arizona,  with  the  inflation  rate  in the  Phoenix
metropolitan  area about twice the national  average.  As a result,  the state's
traditional  cost advantage may be disappearing.  In addition,  unemployment has
fallen so low in  Arizona  that a  shortage  of skilled  workers  may  constrain
economic  growth  going  forward.  Rapid  economic  and  population  growth  are
straining  the  state's  infrastructure,  which  could  result  in the  need for
significant  capital  outlays.  Arizona's future credit quality will continue to
depend  largely on the state's and  localities'  ability to manage capital plans
and debt issuance.

[line graph - data below]

ARIZONA RESIDENTIAL BUILDING PERMITS AND EMPLOYMENT

             Residential Building Permits                Employment
              (left scale in thousands)          (right scale in millions)
1987                    39.635                              1.39
1988                    32.528                              1.42
1989                    23.315                              1.45
1990                    22.883                              1.48
1991                    23.421                              1.49
1992                    31.365                              1.52
1993                    38.379                              1.58
1994                    51.018                              1.69
1995                    52.648                              1.80
1996                    52.497                              1.90

Source: DRI/McGraw-Hill


4    Arizona Municipal Credit Review                American Century Investments

<TABLE>
<CAPTION>
                      PERFORMANCE & PORTFOLIO INFORMATION

                                             30-Day                  30-Day Tax-Equivalent Yields
                                               SEC         31.02%        33.90%        34.59%        39.33%
                                              Yield      Tax Bracket   Tax Bracket  Tax Bracket   Tax Bracket

CURRENT YIELDS AS OF MAY 31, 1997
<S>                                           <C>           <C>           <C>           <C>           <C>  
Arizona Intermediate-Term Municipal           4.18%         6.06%         6.32%         6.39%         6.89%

                                                                  AVERAGE ANNUAL RETURNS
                                            6 MONTHS       1 YEAR        3 YEARS     LIFE OF FUND
TOTAL RETURNS AS OF MAY 31, 1997
Arizona Intermediate-Term Municipal ........  0.94%         5.77%         5.98%         6.37%
Lehman 5-Year General Obligation Index .....  1.28%         6.08%         5.90%         5.93%(2)
Average Other States Intermediate
Municipal Debt Fund(1) .....................  1.21%         6.01%         5.44%         5.54%(2)
Fund's Ranking Among Other States
Intermediate Municipal Debt Funds(1) .......     --     48 out of 67   5 out of 53  3 out of 52(2)

(1) According to Lipper Analytical Services.
(2) Since  4/30/94,  the date  nearest the fund's  inception  for which data are
available. Inception date was April 11, 1994.
</TABLE>

See pages 20-21 for more information  about returns,  the comparative  index and
Lipper fund rankings.

[line graph - data below]

GROWTH OF $10,000 OVER THE LIFE OF THE FUND
Value on 5/31/97

$10,000 investment made 4/30/94

Arizona Intermediate-Term Municipal $12,031
Lehman 5-Year GO Index     $11,945

          Arizona Intermediate-Term Municipal      Lehman 5-Year GO Index
                       $10,000                            $10,000
May-94                 $10,092                            $10,056
Jun-94                 $10,064                            $10,033
Jul-94                 $10,234                            $10,142
Aug-94                 $10,280                            $10,191
Sep-94                 $10,202                            $10,114
Oct-94                 $10,083                            $10,058
Nov-94                  $9,973                             $9,993
Dec-94                 $10,098                            $10,081
Jan-95                 $10,268                            $10,178
Feb-95                 $10,443                            $10,326
Mar-95                 $10,562                            $10,490
Apr-95                 $10,625                            $10,518
May-95                 $10,852                            $10,749
Jun-95                 $10,855                            $10,757
Jul-95                 $10,985                            $10,908
Aug-95                 $11,085                            $11,018
Sep-95                 $11,130                            $11,051
Oct-95                 $11,233                            $11,097
Nov-95                 $11,343                            $11,192
Dec-95                 $11,426                            $11,253
Jan-96                 $11,574                            $11,387
Feb-96                 $11,541                            $11,349
Mar-96                 $11,365                            $11,288
Apr-96                 $11,378                            $11,271
May-96                 $11,357                            $11,258
Jun-96                 $11,428                            $11,338
Jul-96                 $11,540                            $11,413
Aug-96                 $11,539                            $11,436
Sep-96                 $11,614                            $11,522
Oct-96                 $11,724                            $11,629
Nov-96                 $11,900                            $11,791
Dec-96                 $11,853                            $11,774
Jan-97                 $11,874                            $11,805
Feb-97                 $11,948                            $11,889
Mar-97                 $11,809                            $11,755
Apr-97                 $11,852                            $11,814
May-97                 $12,031                            $11,945

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost. The graph begins on 4/30/94,  the date nearest the fund's 4/11/94
inception date for which index return data are available.

The line representing the fund's total return includes  operating expenses (such
as transaction  costs and management fees) that reduce returns,  while the total
return line of the index does not.

PORTFOLIO AT A GLANCE
                           5/31/97     5/31/96
Number of Securities         37          34
Weighted Average Maturity 7.2 years   7.1 years
Average Duration          5.0 years   5.4 years
Expense Ratio               0.66%       0.50%


Annual Report                           Performance & Portfolio Information    5


                                MANAGEMENT Q & A

An interview with Colleen Denzler,  a senior municipal  portfolio manager on the
Arizona Municipal funds management team.

How did the fund perform?

The fund produced a favorable return despite shifting market  expectations.  For
the fiscal year ended May 31, 1997, the fund's total return was 5.77%,+ compared
with the 6.01% return of the 67 "Other States Intermediate Municipal Debt Funds"
tracked  by Lipper  Analytical  Services.  (See the Total  Returns  table on the
previous page for other fund performance comparisons.)

Why did the fund underperform its peers?

The fund's peer group includes municipal intermediate-term funds from many other
states.  Each  state is  subject to fiscal  trends  that can make its  municipal
securities  perform either better or worse than other  state-issued  municipals.
This discrepancy can have a sizable impact on how one  state-specific  municipal
fund's  performance  compares  against another.  The category  includes only one
other Arizona municipal fund, which our fund strongly outperformed.

Did you change the fund's duration much during the fiscal year?

No.  We  made  only  slight  adjustments  to the  fund's  duration,  keeping  it
conservatively  positioned  within a narrow range around 5.0-5.4  years--roughly
neutral  compared  with  its  peers.  We  adjusted  that  position  slightly  as
conditions warranted but continued to avoid making interest rate bets that could
cause unwanted volatility in the fund's returns.

You held a Treasury put option during the period. Why?

We bought a Treasury  put option as a form of  insurance  against a bond  market
decline.  (A  put  option  allows  the  bondholder  to  sell  a  security  at  a
pre-determined  price up until a specified  date.) Since  municipal  prices were
falling less than Treasury prices during the first four months of 1997,  hedging
the fund with a  Treasury  Put  allowed us to  capture  appreciation  on the put
option, while continuing to hold scarce intermediate-term municipal securities.

[bar graph - data below]

ARIZONA INTERMEDIATE-TERM MUNICIPAL'S ONE-YEAR RETURNS SINCE INCEPTION
(Periods ended May 31)

        Arizona Intermediate-Term Municipal      Lehman 5-Year GO Index
5/94*                  0.92%                              0.56%
5/95                   7.52%                              6.89%
5/96                   4.65%                              4.74%
5/97                   5.77%                              6.08%

This graph  illustrates the fund's returns since its inception and compares them
with the index's returns.  The fund's total returns for the 1996 and 1997 fiscal
years include operating expenses,  while the comparative index's returns do not.
See page 20 for a definition of the index.

* Return from 4/30/94 to 5/31/94.

+ Benham Management  Corporation absorbed a small portion of the fund's expenses
during June 1996.  The fund's ranking would have been lower if the fund's return
had been reduced by those expenses.


6    Management Q & A                               American Century Investments

                                MANAGEMENT Q & A

But why not purchase a municipal put option instead of a Treasury put?

Treasury puts are extremely  liquid due to the vast amount of buyers and sellers
in the U.S. Treasury futures market.  By contrast,  the municipal futures market
is only a small  fraction  of that  size  and  offers  far  less  liquidity.  In
purchasing a Treasury put instead of a municipal  put, we ensured our ability to
sell the option without liquidity problems.

What is your outlook for the municipal market?

If  U.S.  economic  growth  continues  to  slow  of its  own  accord,  municipal
securities could rally, but any signs of an overheating economy will likely push
municipal bond prices lower.

Another  important  factor is the relative  performance  between  municipal  and
Treasury securities. For the first five months of 1997, municipals significantly
outperformed  Treasurys,  a situation caused in part by relatively low municipal
issuance.  Although  municipal  issuance should remain fairly light for the near
future, the likelihood that municipal bonds will continue this outperformance is
diminishing--their   prices  have  reached  levels  where  they  are  considered
historically  expensive  compared with  like-maturity  Treasurys.  If municipals
continue this trend much longer,  investor demand could eventually shift back to
Treasurys, removing a key support for municipal bond prices.

With this outlook in mind, what are your plans for the fund going forward?

We plan to increase our focus on the spread,  or difference,  between the yields
of shorter- and  longer-term  municipals.  With the help of our credit  research
team, we will also look for undervalued  securities that we believe will enhance
the fund's yield.  We will also continue to monitor the relative  performance of
Treasury versus municipal securities.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 5/31/97)
GO 51%
Revenue Bonds 20%
COPs/Leases 12%
Prerefunded/ETM 10%
Land-Secured 7%

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 11/30/96) 
Revenue Bonds 41% 
GO 34%
COPs/Leases 12% 
Prerefunded/ETM 11% 
Other 2%

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/97)
AAA 54%
AA 28%
A 9%
BBB 9%

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 11/30/96)
AAA 65%
AA 24%
A 5%
BBB 6%


Annual Report                                              Management Q & A    7


                            SCHEDULE OF INVESTMENTS

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

MUNICIPAL SECURITIES
ARIZONA -- 96.9%
$ 1,000,000   Arizona State Transportation Board
                Highway Rev., 6.00%, 7/1/08                      $1,082,940
  1,000,000   Arizona Transportation Board
                Excise Tax Rev., 7.00%, 7/1/99,
                Prerefunded at 102% of Par
                (MBIA)(1)                                         1,073,140
    900,000   Coconino/Yavapai County Sedona
                Unified School District No. 9 GO,
                5.60%, 7/1/06 (FGIC)                                937,323
  1,000,000   East Valley Institute of Technology
                No. 401 GO, 5.00%, 7/1/03
                (AMBAC)                                           1,015,940
  1,025,000   Flagstaff GO, 6.50%, 7/1/03
                (FGIC)                                            1,121,904
    545,000   Gilbert County GO, Series C,
                6.00%, 7/1/02 (MBIA)                                579,351
  1,000,000   Maricopa County Community
                College GO, Series A, 6.80%,
                7/1/98                                            1,031,610
    500,000   Maricopa County GO, 6.25%,
                7/1/03 (FGIC)                                       540,720
  1,000,000   Maricopa County Hospital Rev.,
                (Sun Health Corp.), 5.75%,
                4/1/07                                            1,021,760
    500,000   Maricopa County Industrial
                Development Auth. Hospital
                Facility Rev., (Samaritan Health
                Services), 7.15%, 12/1/04
                (MBIA)                                              569,050
  1,000,000   Maricopa County Public Financing
                Corporation Certificates of
                Participation, Series 1994,
                5.625%, 6/1/00                                    1,017,780
  1,000,000   Maricopa County Unified School
                District No. 1 GO, (Phoenix
                Elementary), 5.50%, 7/1/09
                (MBIA)                                            1,032,220
  1,000,000   Maricopa County Unified School
                District No. 41 GO, (Gilbert),
                Series 1988 F, 6.20%, 7/1/02,
                Prerefunded at Par (FGIC)(1)                      1,073,420

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 1,000,000   Maricopa County Unified School
                District No. 48 GO, (Scottsdale),
                6.60%, 7/1/12                                    $1,135,490
  1,000,000   Maricopa County Unified School
                District No. 90 GO, (Ruth Fisher
                Elementary), 5.375%, 7/1/00                       1,020,170
  1,000,000   Maricopa County Unified School
                District No. 97 GO, (Deer Valley),
                Series A, 6.25%, 7/1/06 (MBIA)                    1,102,230
    300,000   Phoenix Airport Rev., Series 1994 C,
                5.50%, 7/1/01 (MBIA)                                309,153
    635,000   Phoenix Civic Improvement Corp.
                Wastewater Rev., 6.125%,
                7/1/03, Prerefunded at 102%
                of Par(1)                                           693,191
  1,000,000   Phoenix Civic Improvement Corp.
                Wastewater Rev. Certificates of
                Participation, 4.85%, 7/1/07
                (MBIA)                                              988,890
    500,000   Phoenix Civic Improvement Corp.
                Water Systems Rev., 6.00%,
                7/1/02                                              530,585
    550,000   Phoenix GO, 6.00%, 7/1/01                             580,558
    500,000   Phoenix Street and Highway Rev.,
                Series 1992, 5.95%, 7/1/00                          521,470
    350,000   Phoenix Street and Highway Rev.,
                Series 1992, 6.25%, 7/1/06                          377,402
  1,000,000   Pima County Sewer Rev., Series
                1991, 6.20%, 7/1/00 (FGIC)                        1,051,250
  1,000,000   Pima County Unified School
                District No. 10 GO,
                (Amphitheater), 7.00%, 7/1/05
                (MBIA)                                            1,144,150
  1,000,000   Pima County Unified School
                District No. 12 GO, (Sunnyside),
                5.50%, 7/1/09 (MBIA)                              1,024,730
  1,000,000   Salt River Project Agricultural
                Improvement and Power District
                Rev., Series B, 6.50%, 1/1/04                     1,097,040
    480,000   Scottsdale GO, Series 1994,
                7.50%, 7/1/02                                       542,112
  1,275,000   Tempe GO, 6.25%, 7/1/05                             1,398,076
    525,000   Tucson Certificates of Participation,
                5.70%, 7/1/02                                       530,407
    200,000   Tucson Street and Highway Rev.,
                4.50%, 7/1/98                                       201,374

See Notes to Financial Statements


8    Schedule of Investments                        American Century Investments


                            SCHEDULE OF INVESTMENTS

MAY 31, 1997

Principal Amount                                                        Value
- --------------------------------------------------------------------------------

$ 1,000,000   Tucson Street and Highway Rev.,
                Series 1992, 5.70%, 7/1/01                     $  1,041,450
    500,000   Yavapai County Unified School
                District No. 28 GO, (Camp Verde),
                Series 1995, 6.10%, 7/1/04
                (FGIC)                                              540,345
  1,000,000   Yuma County Jail District Rev., 5.25%,
                7/1/12 (AMBAC)                                      986,130
                                                                 ----------
                                                                 28,913,361
                                                                 ----------
GUAM -- 1.7%
500,000       Guam Power Auth. Rev., Series
                1994A, 5.20%, 10/1/97                               502,170
                                                                 ----------
PUERTO RICO -- 0.7%
200,000       Puerto Rico Public Education and
                Health Rev., 7.60%, 7/1/97,
                Prerefunded at 102% of Par
                (FGIC)(1)                                           204,649
                                                                 ----------
TOTAL MUNICIPAL SECURITIES-99.3%                                 29,620,180
                                                                 ----------
   (Cost $29,010,155)

SHORT-TERM  MUNICIPAL  SECURITIES - 0.7% 200,000 Phoenix Industrial  Development
Auth.
                Multifamily Housing Rev.,
                (Del Mar Terrace Apartment
                Project), VRDN, 3.90%, 6/5/97                       200,000
                                                                 ----------
   (Cost $200,000)
TOTAL INVESTMENT SECURITIES - 100.0%                            $29,820,180
                                                                 ==========
   (Cost  $29,210,155)  

Notes to Schedule of Investments 
AMBAC = AMBAC Indemnity Corp.
FGIC = Financial Guaranty Insurance Company
GO = General Obligation
MBIA = Municipal Bond Insurance Association
VRDN = Variable Rate Demand Note.  Interest reset date is indicated and used
in calculating the weighted average portfolio maturity.  Rate shown is
effective May 31, 1997.
(1) Escrowed in U.S. Government Securities.

See Notes to Financial Statements


Annual Report                                      Schedule of Investments     9


<TABLE>
<CAPTION>
                      STATEMENT OF ASSETS AND LIABILITIES

MAY 31, 1997

ASSETS
<S>                                                                                                     <C>    
Investment securities, at value (identified cost of $29,210,155) (Note 3) ......................... $29,820,180
Cash ..............................................................................................     107,903
Interest receivable ...............................................................................     677,629
Prepaid expenses and other assets .................................................................       3,551
                                                                                                          -----
                                                                                                     30,609,263
                                                                                                     ----------

LIABILITIES
Disbursements in excess of demand deposit cash ....................................................         998
Payable for capital shares redeemed ...............................................................      31,317
Payable to affiliates (Note 2) ....................................................................      17,032
Dividends payable .................................................................................       4,559
Accrued expenses and other liabilities ............................................................         794
                                                                                                            ---
                                                                                                         54,700
                                                                                                         ------
Net Assets Applicable to Outstanding Shares ....................................................... $30,554,563
                                                                                                    ===========

CAPITAL SHARES
Outstanding (unlimited number of shares authorized) ...............................................   2,926,974
                                                                                                      =========

Net Asset Value Per Share .........................................................................     $10.44
                                                                                                        ======

NET ASSETS CONSIST OF:
Capital paid in ................................................................................... $29,945,116
Accumulated net realized loss on investment transactions ..........................................        (578)
Net unrealized appreciation on investments (Note 3) ...............................................     610,025
                                                                                                        -------
                                                                                                    $30,554,563
                                                                                                    ===========
</TABLE>


See Notes to Financial Statements


10   Statement of Assets and Liabilities            American Century Investments

<TABLE>
<CAPTION>
                            STATEMENT OF OPERATIONS

YEAR ENDED MAY 31, 1997

INVESTMENT INCOME
Income:
<S>                                                                                                 <C>       
Interest .......................................................................................... $1,390,541
                                                                                                    ----------

Expenses (Note 2):
Investment advisory fees ..........................................................................    118,668
Administrative fees ...............................................................................     26,168
Transfer agency fees ..............................................................................     19,990
Printing and postage ..............................................................................     19,148
Auditing and legal fees ...........................................................................      8,838
Custodian fees ....................................................................................      8,269
Registration and filing fees ......................................................................      4,997
Trustees' fees and expenses .......................................................................      1,385
Organizational expenses ...........................................................................      1,012
Other operating expenses ..........................................................................     11,926
                                                                                                        ------
  Total expenses ..................................................................................    220,401
Amount waived .....................................................................................    (36,963)
                                                                                                       ------- 
  Net expenses ....................................................................................    183,438
                                                                                                       -------
Net investment income .............................................................................  1,207,103
                                                                                                     ---------

REALIZED AND UNREALIZED GAIN
ON INVESTMENTS (NOTE 3)
Net realized gain on investments ..................................................................     12,678
Change in net unrealized appreciation on investments ..............................................    303,847
                                                                                                       -------

Net realized and unrealized
gain on investments ...............................................................................    316,525
                                                                                                       -------
Net Increase in Net Assets
Resulting from Operations ......................................................................... $1,523,628
                                                                                                    ==========
</TABLE>
See Notes to Financial Statements


Annual Report                                       Statement of Operations   11

<TABLE>
<CAPTION>
                      STATEMENTS OF CHANGES IN NET ASSETS

YEARS ENDED MAY 31, 1997
AND MAY 31, 1996

Increase in Net Assets                                                                1997             1996
OPERATIONS
<S>                                                                                <C>              <C>         
Net investment income .........................................................   $  1,207,103    $  1,130,533
Net realized gain on investment transactions ..................................         12,678          88,040
Change in net unrealized appreciation (depreciation) on investments ...........        303,847        (276,781)
                                                                                       -------        -------- 
Net increase in net assets resulting from operations ..........................      1,523,628         941,792
                                                                                     ---------         -------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income ....................................................     (1,207,103)     (1,130,533)
From net realized gains from investment transactions ..........................            --          (12,741)
                                                                                     ---------         -------
Decrease in net assets from distributions .....................................     (1,207,103)     (1,143,274)
                                                                                    ----------      ---------- 

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold .....................................................     15,353,294      11,716,512
Proceeds from reinvestment of distributions ...................................        917,406         884,795
Payments for shares redeemed ..................................................    (11,821,630)     (6,389,076)
                                                                                   -----------      ---------- 
Net increase in net assets from capital share transactions ....................      4,449,070       6,212,231
                                                                                     ---------       ---------

Net increase in net assets ....................................................      4,765,595       6,010,749

NET ASSETS
Beginning of year .............................................................     25,788,968      19,778,219
                                                                                    ----------      ----------

End of year ...................................................................    $30,554,563     $25,788,968
                                                                                   ===========     ===========

TRANSACTIONS IN SHARES OF THE FUND
Sold ..........................................................................      1,472,637       1,117,476
Issued in reinvestment of distributions .......................................         88,040          84,549
Redeemed ......................................................................     (1,134,039)       (611,773)
                                                                                    ----------        -------- 
Net increase ..................................................................        426,638         590,252
                                                                                       =======         =======
</TABLE>
See Notes to Financial Statements


12   Statements of Changes in Net Assets            American Century Investments


                         NOTES TO FINANCIAL STATEMENTS

MAY 31, 1997

1. Organization and Summary of Significant Accounting Policies

Organization--American  Century  Municipal Trust (the Trust) is registered under
the Investment Company Act of 1940 as an open-end management investment company.
American Century - Benham Arizona Intermediate-Term Municipal Fund (the Fund) is
one of the six funds issued by the Trust. The Fund is non-diversified  under the
1940 Act. The objective of the Fund is to seek as high a level of current income
exempt from  federal  income  taxes as is  consistent  with  prudent  investment
management and conservation of shareholders' capital. The Fund invests primarily
in  intermediate-term  municipal  obligations  and maintains a weighted  average
maturity from five to ten years.  The Fund  concentrates  its  investments  in a
single state and  therefore may have more exposure to credit risk related to the
state of Arizona than a fund with a broader  geographical  diversification.  The
following significant  accounting policies related to the Fund are in accordance
with accounting policies generally accepted in the investment company industry.

Security  Valuations--Securities  are valued through valuations  obtained from a
commercial  pricing  service  or at the mean of the most  recent  bid and  asked
prices. When valuations are not readily available, securities are valued at fair
value as  determined  in  accordance  with  procedures  adopted  by the Board of
Trustees.

Security  Transactions--Security  transactions  are  accounted  for on the  date
purchased  or  sold.  Net  realized  gains  and  losses  are  determined  on the
identified cost basis, which is also used for federal income tax purposes.

Investment Income--Interest income is recorded on the accrual basis and includes
amortization  of discounts and premiums.  Premiums and original issue  discounts
are amortized daily using the effective  interest rate method.  Market discounts
are recognized as income upon the sale or maturity of securities.

Income Tax  Status--It  is the Fund's policy to  distribute  all net  investment
income and net realized capital gains to shareholders  and to otherwise  qualify
as a regulated  investment  company under the provisions of the Internal Revenue
Code. Accordingly, no provision has been made for federal or state taxes.

Distributions to  Shareholders--  Distributions  from net investment  income are
declared daily and distributed  monthly.  Distributions  from net realized gains
are declared  and paid  annually.  For the year ended May 31, 1997,  100% of the
Fund's  distributions  from net investment income have been designated as exempt
from federal income taxes.

The character of distributions  made during the year from net investment  income
or net  realized  gains may differ  from  their  ultimate  characterization  for
federal income tax purposes due to differences in the  recognition of income and
expense items for financial reporting and tax purposes.

Supplementary  Information--Certain  officers and trustees of the Trust are also
officers and/or directors, and, as a group, controlling stockholders of American
Century  Companies,  Inc. (ACC), the parent of the Trust's  investment  advisor,
Benham Management  Corporation (BMC), the Trust's distributor,  American Century
Investment  Services,  Inc.  (ACIS),  and the Trust's  transfer agent,  American
Century Services Corporation (ACSC).

Futures  Contracts--The  Fund may buy and sell interest  rate futures  contracts
relating to debt  securities and write and buy put and call options  relating to
interest  rate  futures  contracts.   The  Fund  may  use  futures  and  options
transactions  to maintain cash  reserves  while  remaining  fully  invested,  to
facilitate  trading, to reduce transaction costs, or to pursue higher investment
returns when a futures contract is priced more  attractively than its underlying
security  or index.  One of the risks of entering  into  futures may include the
possibility that the changes in value of the contract may not correlate with the
changes in value of the  underlying  securities.  Upon  entering  into a futures
contract, the Fund is required to deposit either cash or securities in an amount
equal to a certain percentage of the contract value (initial margin). Subsequent
payments  (variation  margin) are made or received  daily, in cash, by the Fund.
The variation  margin is equal to the daily change in the contract  value and is
recorded as an unrealized  gain or loss. The Fund  recognizes a realized gain or
loss  when the  contract  is  closed  or  expires.  There  were no open  futures
contracts at May 31, 1997.

Use of  Estimates--The  preparation of financial  statements in conformity  with
generally accepted  accounting  principles requires management to make estimates
and assumptions  that affect the reported  amounts of assets and liabilities and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements  and the reported  amounts of increases  and  decreases in net assets
from  operations  during the  period.  Actual  results  could  differ from these
estimates.


Annual Report                                 Notes to Financial Statements   13


                         NOTES TO FINANCIAL STATEMENTS

                                  MAY 31, 1997

- --------------------------------------------------------------------------------
2. Transactions with Related Parties

The  Trust has  entered  into an  Investment  Advisory  Agreement  with BMC that
provides  the  Trust  with  investment  advisory  services  in  exchange  for an
investment  advisory  fee.  ACSC pays all  compensation  of Trust  officers  and
trustees who are officers or  directors  of ACC or any of its  subsidiaries.  In
addition,  promotion and  distribution  expenses are paid by BMC. The investment
advisory  fee is paid  monthly  by the Fund  based on its pro rata  share of the
dollar amount derived from applying the Trust's average daily closing net assets
to the following annualized investment advisory fee schedule.

          0.50% of the first $100 million 
          0.45% of the next $100 million 
          0.40% of the next $100 million  
          0.35% of the next $100 million 
          0.30% of the next $100 million  
          0.25% of the next $1 billion 
          0.24% of the next $1 billion
          0.23% of the next $1 billion  
          0.22% of the next $1 billion 
          0.21% of the next $1 billion 
          0.20% of the next $1 billion
          0.19% of average daily net assets over $6.5 billion

The Trust has an  Administrative  Services and Transfer  Agency  Agreement  with
ACSC. Under the agreement,  ACSC provides  substantially all  administrative and
transfer agency services  necessary to operate the Fund. Fees for these services
are based on  transaction  volume,  number of  accounts  and the  average  daily
closing net assets of all funds advised by BMC.

The Trust has an additional agreement with BMC pursuant to which BMC established
a contractual  expense guarantee that limits Fund expenses (excluding items such
as brokerage  commissions,  taxes,  interest,  custodian  earnings credits,  and
extraordinary  expenses)  to 0.67% of average  daily  closing  net  assets.  The
agreement provides that BMC may recover amounts (representing expenses in excess
of the Fund's expense  guarantee  rate) absorbed during the preceding 11 months,
if, and to the extent that,  for any given month,  the Fund's  expenses are less
than the expense  guarantee rate in effect at that time. BMC voluntarily  agreed
to absorb all expenses for the Fund through December 31, 1995. Beginning January
1, 1996, the Fund added expenses at a rate of 0.10% of average daily closing net
assets per month until the Fund reached the contractual expense rate of 0.67%.

The payable to affiliates as of May 31, 1997, based on the above agreements, was
as follows:

Investment Advisor                           $11,077
Administrative Services and
Transfer Agent                                 5,955
                                             -------
                                             $17,032
                                             =======

On April 25, 1997, the Board of Trustees  approved a plan to implement a unified
management fee, which would replace the existing  contracts between the Fund and
related parties.  Such plan is subject to shareholder approval and will be voted
on in July,  1997.  Results of the vote were unknown at the time this report was
printed.

The Trust has a  Distribution  Agreement  with ACIS,  which is  responsible  for
promoting sales of and distributing the Trust's shares.

- --------------------------------------------------------------------------------
3. Investment Transactions

Purchases  and  sales of  municipal  debt  obligations,  other  than  short-term
investments totaled $29,769,416 and $21,804,953, respectively.

As of May 31,  1997,  accumulated  net  unrealized  appreciation  was  $610,025,
consisting of unrealized  appreciation of $611,901, and unrealized  depreciation
of $1,876. The aggregate cost of investments for federal income tax purposes was
the same as the cost for financial reporting purposes.


14   Notes to Financial Statements                  American Century Investments

<TABLE>
<CAPTION>
                              FINANCIAL HIGHLIGHTS

     For a Share Outstanding Throughout the Years Ended May 31 (except as noted)

                                                                 1997         1996         1995         1994(1)

PER-SHARE DATA
Net Asset Value,
<S>                                                            <C>           <C>          <C>          <C>   
Beginning of Period .......................................    $10.31        $10.35       $10.13       $10.00
                                                               ------        ------       ------       ------
Income From Investment Operations
  Net Investment Income ...................................      0.45          0.51         0.51         0.07
  Net Realized and Unrealized Gain (Loss)
  on Investment Transactions ..............................      0.13         (0.03)        0.22         0.13
                                                                 ----         -----         ----         ----
  Total From Investment Operations ........................      0.58          0.48         0.73         0.20
                                                                 ----          ----         ----         ----
Distributions
  From Net Investment Income ..............................     (0.45)        (0.51)       (0.51)       (0.07)
  From Net Realized Gains on
  Investment Transactions .................................      --           (0.01)        --           --
                                                                 ----          ----         ----         ----
  Total Distributions .....................................     (0.45)        (0.52)       (0.51)       (0.07)
                                                                -----         -----        -----        ----- 
Net Asset Value, End of Period ............................    $10.44        $10.31       $10.35       $10.13
                                                               ======        ======       ======       ======

Total Return(2) ...........................................      5.77%         4.65%        7.52%        1.99%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets .....................................      0.66%         0.14%        --           --
Ratio of Operating Expenses to Average
Net Assets (Before Expense Waiver) ........................      0.79%         0.82%        1.01%     2.33%(3)
Ratio of Net Investment
Income to Average Net Assets ..............................      4.35%         4.85%        5.16%     5.08%(3)
Ratio of Net Investment Income to
Average Net Assets (Before Expense Waiver) ................      4.22%         4.17%        4.15%     2.75%(3)
Portfolio Turnover Rate ...................................        81%           36%          33%       18%
Net Assets, End
of Period (in thousands) ..................................   $30,555       $25,789      $19,778    $7,187


(1)  April 11, 1994 (inception) through May 31, 1994.

(2)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any. Total returns for periods less than one year are not
     annualized.

(3)  Annualized.

See Notes to Financial Statements
</TABLE>


Annual Report                                          Financial Highlights   15


                          INDEPENDENT AUDITORS' REPORT

The Board of Trustees and Shareholders
American Century Municipal Trust:

We have audited the accompanying statement of assets and liabilities,  including
the schedule of  investment  securities,  of American  Century - Benham  Arizona
Intermediate-Term  Municipal Fund (one of the series comprising American Century
Municipal  Trust) (the Fund) as of May 31,  1997,  and the related  statement of
operations for the year then ended,  the statements of changes in net assets for
the two years then ended,  and the financial  highlights for each of the periods
presented.   These  financial   statements  and  financial  highlights  are  the
responsibility  of the Fund's  management.  Our  responsibility is to express an
opinion on these  financial  statements  and financial  highlights  based on our
audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about whether the financial  statements and the financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  Our procedures included  confirmation of securities owned as of May
31, 1997, by correspondence with the custodian. An audit also includes assessing
the accounting principles used and significant estimates made by management,  as
well as evaluating the overall financial statement presentation. We believe that
our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements and the financial highlights referred
to above present fairly, in all material respects, the financial position of the
Fund as of May 31, 1997, the results of its  operations,  the changes in its net
assets  and  its  financial  highlights  for the  periods  indicated  above,  in
conformity with generally accepted accounting principles.

/s/KPMG Peat Marwick LLP 
KPMG Peat Marwick LLP 

Kansas City, Missouri
July 7, 1997


16   Independent Auditors' Report                   American Century Investments


                                     NOTES

Annual Report                                                         Notes   17


                                     NOTES

18   Notes                                          American Century Investments


                                     NOTES

Annual Report                                                         Notes   19


                             BACKGROUND INFORMATION

Investment Philosophy & Policies

American Century  Investments offers 42 fixed-income  funds,  ranging from money
market funds to long-term  bond funds and including  both taxable and tax-exempt
funds.

Arizona Intermediate-Term  Municipal is a variable-price bond fund that seeks to
provide  interest income exempt from both Arizona and federal income taxes.  The
fund invests primarily in  intermediate-term  Arizona municipal  securities with
maturities  of four or more years and maintains a weighted  average  maturity of
five to 10 years.

Comparative Indices

The index listed  below is used in the report to serve as a  comparison  for the
performance of a fund. It is not an investment product available for purchase.

The Lehman 5-Year Municipal  General  Obligation Index is a municipal bond index
composed of more than 11,000  bonds with  maturities  of four to six years.  The
bonds are rated BBB or higher by  Standard & Poor's,  with an average  rating of
AA. The average maturity of the index is five years.

Lipper Rankings

Lipper Analytical Services,  Inc. is an independent mutual fund ranking service.
Rankings  are based on average  annual  total  returns  for each fund in a given
category for the periods  indicated.  Rankings are not included for periods less
than one year.

The funds in Lipper's  Other States  Intermediate  Municipal Debt Funds category
invest in municipal debt issues with dollar-weighted  average maturities of five
to 10 years and which are exempt  from  taxation  on a  specified  city or state
basis.


PORTFOLIO MANAGEMENT TEAM

Senior Municipal Portfolio Manager  Colleen Denzler
Municipal Credit Research Manager   Steven Permut
Credit Analysts                     Scott Lord, Bill McClintock,
                                    David Moore, Tim Benham


20   Background Information                         American Century Investments


                                    GLOSSARY
Returns

o Total  Return  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

o Average Annual Returns  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on page 15.

Yields

o 30-Day SEC Yield  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annual percentage rate based on the fund's share
price at the end of the 30-day  period.  The SEC yield  should be regarded as an
estimate of the fund's investment income, and it may not equal the fund's actual
income  distribution  rate, the income paid to a shareholder's  account,  or the
income reported in the fund's financial statements.

o  Tax-Equivalent  Yields show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

Bond Portfolio Structures

o Barbell  Structure--a  structure  that  overweights  a portfolio in short- and
long-term  securities  and  underweights   intermediate-term   securities.  This
structure  tends to perform  best when the yield  curve is moving  from steep to
flat.  (Short-term  rates are rising faster than long-term  rates,  or long-term
rates are falling faster than short-term rates.)

o Bullet  Structure--a  structure  that clusters a portfolio's  bond  maturities
around a single maturity (usually an intermediate-term maturity). This structure
tends  to  perform  best  when the  yield  curve is  moving  from  flat to steep
(long-term  rates are rising faster than short-term  rates, or short-term  rates
are falling faster than long-term rates).

o Ladder  Structure--a  balanced structure that staggers bond maturities so they
occur at regular  intervals.  This structure tends to perform best when interest
rates are  relatively  stable,  and it  provides a regular  schedule of maturing
securities.

Investment Terms

o Basis Point--a basis point equals one  one-hundredth of a percentage point (or
0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

o Yield Curve--a graphic representation of the relationship between maturity and
yield  for  fixed-income   securities.   Yield  curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

Portfolio Statistics

o Number of Securities--the  number of different  securities issuances held by a
fund on a given date.

o  Weighted  Average  Maturity--measures  the  average  amount of time until the
securities in a bond portfolio mature, weighted by dollar amount.

o Average  Duration--measures the interest rate sensitivity of a bond portfolio.
Measured in years, average duration represents the approximate percentage change
in the  value  of a bond  portfolio  if  interest  rates  move up or down by one
percentage point.

o Expense Ratio--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder's account.

Types of Municipal Securities

o  COPs/Leases--securities  issued to finance public property improvements (such
as city halls and police  stations) and  equipment  purchases.  Certificates  of
participation  represent long-term debt obligations,  while leases have a higher
risk profile than GOs because they require annual appropriation.

o  GO Bonds--general obligation securities backed by the taxing power of the
issuer.

o  Land-Secured  Bonds--securities  such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.

o Prerefunded Bonds/ETM Bonds--securities  refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

o  Revenue  Bonds--securities  backed by  revenues  from  sales  taxes or from a
specific  project,  system or facility (such as a hospital,  electric utility or
water system).


Annual Report                                                        Glossary 21

[american century logo]
American
Century(sm)

P.O. Box 419200
Kansas City, Missouri
64141-6200

Investor Services:
1-800-345-2021 or 816-531-5575

Automated Information Line:
1-800-345-8765

Telecommunications Device for the Deaf:
1-800-634-4113 or 816-444-3485

Fax: 816-340-7962

Internet: www.americancentury.com


AMERICAN CENTURY MUNICIPAL TRUST

Investment Manager
Benham Management Corporation


This  report and the  statements  it  contains  are  submitted  for the  general
information of our  shareholders.  The report is not authorized for distribution
to  prospective  investors  unless  preceded  or  accompanied  by  an  effective
prospectus.

American Century Investment Services, Inc.


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