AMERICAN CENTURY MUNICIPAL TRUST
N-30D, 1997-01-29
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                                SEMIANNUAL REPORT
                                NOVEMBER 30, 1996

                            [american century logo]
                                    American
                                  Century(sm)

                                     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 Overview ..................4
Performance 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 ..............................16
Background Information
     Investment Objectives & Policies .............20
     Comparative Indices ..........................20
     Lipper Rankings ..............................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,  American  Century  funds have
been divided 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             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  expanded  at a modest,  non-inflationary  pace  during the
   six-month  period  ended  November 30, 1996.  As a result,  the U.S.  Federal
   Reserve held short-term interest rates steady.

o  Overall,  municipal securities (munis) performed favorably during the period.
   Historically  low  issuance  of new munis  helped  dampen  market  gyrations,
   keeping prices relatively stable.

o  Looking  forward,  despite  some  uncertainty  about the strength of the U.S.
   economy,  munis  have many  factors  working  in their  favor.  Some of these
   factors  include  the  reduced   likelihood  of  major  tax  reform  and  the
   possibility for further reductions to the U.S. budget deficit.


Credit Overview

o  Arizona's  economy continued to expand during the second half of 1996, though
   at a slower pace than in recent years.

o  As the state's  population  continued to rise, its overall  unemployment rate
   edged  higher to 5.5%  during  September  (slightly  above the 5.2%  national
   average).

o  Arizona's  growing economy and  demonstrated  fiscal  soundness  continued to
   contribute to an improvement in the state's credit quality.

o  Based  upon  Arizona's  history of  conservative  fiscal  management  and our
   expectation that the state's strong  fundamentals will continue,  our outlook
   for Arizona is optimistic.


Intermediate-Term Municipal

o  The fund posted a 4.79% total return for the six-month  period ended November
   30, 1996 (slightly higher than the fund's peer group average).

o  We kept the fund's duration within a narrow range of 5.2-5.4 years during the
   period to help limit unwanted volatility in the fund's returns.

o  Barring a significant change in the economic outlook, we will likely maintain
   the fund's  neutral  stance going forward,  making  selective  adjustments as
   conditions warrant.


                       Arizona Intermediate-Term Municipal

                          Total Returns:AS OF 11/30/96
                                 6 Months 4.79%*
                                  1 Year 4.91%

                            Net Assets:$27.4 million
                                (AS OF 11/30/96)

                            Inception Date: 4/11/94

                              Ticker Symbol: BEAMX


                               * Not annualized.


Semiannual Report                                        Report Highlights     1


                               OUR MESSAGE TO YOU

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

   The six months ended November 30, 1996, were eventful,  both in the U.S. bond
market and at our company. After a rocky period in the first half of 1996, bonds
stabilized  during the summer and enjoyed a rebound in October and November.  In
the following  pages,  our investment  management team provides  further details
about the market and how your fund was managed during the period.

   Changing market conditions  underscore the importance of quality investments.
Our  commitment to quality  securities is  exemplified  by our municipal  credit
research team. The three members of the team carry out in-depth  analysis on all
securities  considered for purchase by American  Century  municipal money market
and bond funds.  The team recently  established a new credit  management  system
that defines investment limits to cap our funds' exposure to individual issuers,
sectors or regions.

   On the corporate front, we completed the operational integration of Twentieth
Century  and The Benham  Group in  September.  As a result,  you now have direct
access to a broader spectrum of funds and services.

   We also changed the name of our company. On January 1, 1997, we began serving
you as American Century  Investments,  which reflects our expanded  identity and
the  independent  thinking  common to  Twentieth  Century and  Benham.  American
Century's  fund  family is divided  into three  groups--the  Benham  Group,  the
American   Century  Group  and  the  Twentieth   Century   Group.   The  Arizona
Intermediate-Term Municipal fund will remain in the Benham Group, reflecting its
continued  adherence  to the  fixed-income  investment  approach  that  we  have
employed for years.

   This report is the first in a new format  designed using your input.  We hope
you find it more informative and easier to read. Another informative resource is
the American Century Web site. If you use a personal  computer and have Internet
access,  we've made it easier for you to  download  information  about  American
Century funds and access your fund  accounts.  With a personal  access code, you
can view account  balances,  exchange money between  existing  accounts and make
additional investments. The Web site address is: www.americancentury.com. We are
one of the first fund  companies to offer direct  on-line  transactions  via the
Internet.

   These are  examples  of how we continue  to work to provide  information  and
services that are useful and convenient to investors in our funds. Thank you for
investing with us.

Sincerely,

/s/James E. Stowers III
James E. Stowers III
President and Chief Executive Officer
American Century Companies


/s/James M. Benham
James M. Benham
Vice Chairman
American Century Companies

2     Our Message to You                            American Century Investments


                                 PERIOD OVERVIEW


U.S. Economy

   During the six months ended November 30, 1996, the U.S. economy  continued to
rebound from slow growth during 1995 and early 1996. An improving retail sector,
surging auto sales and a resilient  housing  market helped the economy expand at
an  impressive  4.7%  annual  rate in the second  quarter of 1996.  The  economy
remained  strong  throughout  the summer as healthy  employment  growth sent the
national  unemployment rate to a six-year low of 5.1% by August.  However,  this
trend  appeared to reverse  itself late in the period--  third-quarter  economic
growth slowed to a more sedate 2.1% annual pace.

   In spite of the second-quarter surge in growth, inflation remained tame. From
the start of 1996 through November, inflation (as measured by the consumer price
index)  grew at an annual  rate of 3.3%.  In light of this lack of  inflationary
pressure, the Fed held short-term interest rates steady throughout the six-month
period.

[line graph - data described below]

U.S. Municipal Bond Market

   Overall,  the six-month  period ended  November 30, 1996, was a favorable one
for municipal bonds (munis). The accompanying muni yield curve graph depicts how
the muni yield curve shifted lower throughout the period.  Although munis traded
listlessly throughout the summer,  reflecting the market's uncertainty about the
strength of the U.S. economy, munis outperformed Treasury securities (Treasurys)
between mid-June and late August. By late September, the outlook for munis began
to  change.  Continued  signs of low  inflation,  stable  monetary  policy,  and
expectations of a status quo election year ignited a substantial market rebound,
which continued through October and November. As is often the case when interest
rates are falling rapidly, munis underperformed Treasurys.

   Muni yields declined  significantly  during the six-month  period.  Yields on
shorter-term  munis fell more than 30 basis points,  while yields on longer-term
munis dropped by about 50 basis points.

   Historically  low issuance of new munis,  especially  among  shorter-maturity
securities,  continued to support muni prices.  While 1996 muni issuance through
November was slightly higher than 1995 levels,  the limited supply helped dampen
market  volatility  and  keep  prices  relatively  stable.  Although  some  muni
refunding  activity  occurred when interest  rates fell late in the period,  the
refundings had little impact on bond prices.

   Looking forward, more recent data has provided enough conflicting evidence to
cause considerable  uncertainty about the rate of U.S. economic growth.  Despite
this concern,  there are many positive  factors working in munis' favor.  One is
muni issuance,  which should remain at historically low levels in the near term.
Barring a significant  decrease in interest rates,  muni refundings  should also
remain tame.  In addition,  the reduced  likelihood  of major tax reform and the
possibility for further reductions to the budget deficit improve the outlook for
munis.

[line graph data]

   Municipal Yield Curve

   Years          11/29/96          8/26/96          6/14/96
   1              3.46%             3.8%             3.76%
   2              3.76              4.05             4.25
   3              3.96              4.25             4.47
   4              4.08              4.4              4.62
   5              4.18              4.5              4.74
   6              4.28              4.6              4.84
   7              4.38              4.7              4.94
   8              4.48              4.8              5.04
   9              4.58              4.9              5.14
   10             4.68              5                5.24
   11             4.768             5.082            5.33
   12             4.856             5.164            5.42
   13             4.944             5.246            5.51
   14             5.032             5.328            5.6
   15             5.12              5.41             5.69
   16             5.148             5.444            5.724
   17             5.176             5.478            5.758
   18             5.204             5.512            5.792
   19             5.232             5.546            5.826
   20             5.26              5.58             5.86
   21             5.268             5.588            5.868
   22             5.276             5.596            5.876
   23             5.284             5.604            5.884
   24             5.292             5.612            5.892
   25             5.3               5.62             5.9
   26             5.304             5.624            5.904
   27             5.308             5.628            5.908
   28             5.312             5.632            5.912
   29             5.316             5.636            5.916
   30             5.32              5.64             5.92


Investment terms are defined in the Glossary on page 21.

Semiannual Report                                          Period Overview     3


                        ARIZONA MUNICIPAL CREDIT OVERVIEW

   Arizona's  economy continued to expand during the second half of 1996, though
at a slower pace than in recent years.  Overall,  the state's  unemployment rate
edged higher to 5.5% during September, slightly above the 5.2% national average.
However,  labor markets remain tight in the Phoenix and Tucson areas,  where the
unemployment rate as of August was 3.7% and 3.6%, respectively.

   The state  continued  to  experience  significant  population  growth in 1996
following a 1995  increase of 3.5%,  the  second-largest  increase in percentage
terms in the nation.  Arizona's  metropolitan  areas posted  population  and per
capita  personal income growth second only to Las Vegas.  Arizona  residents saw
their  personal  incomes  expand at a 7.3%  annual rate  between  1990 and 1995,
behind only Utah and Nevada.

   The combination of strong economic  activity and population growth is buoying
the state's  construction  sector.  Total building permit issuance  continued to
climb  during  1996.  Though  permit  issuance  remains at a high annual  level,
residential  building  permits have actually  tapered off (see the  accompanying
graph  for  trends  in  residential   building  permit   issuance).   Commercial
construction  is  forging  ahead,   however,  and  should  support  the  state's
construction sector for the near future.

[line graph - data described below]

   International  trade and tourism also proved to be strong  components  of the
economy. The state attracted roughly 20 million visitors through September 1996,
consistent  with 1995's  total of 25 million.  Arizona  also  benefited  from an
increase in  cross-border  trade with  Mexico as a result of the North  American
Free Trade Agreement (NAFTA).

   Arizona's  positive  economic  environment  translated  into a 7% increase in
aggregate  retail  sales in 1996 over 1995  levels.  The steady  rise in taxable
sales  indicated  by the  accompanying  graph  has  been  good  for the  state's
budget--general fund revenues are also up almost 5% on a year-over-year basis in
fiscal 1996.

   The state's growing economy and  demonstrated  fiscal  soundness  continue to
contribute to an improvement in Arizona credit quality. Credit trends have shown
improvement  in the  metropolitan  areas of Phoenix and  Tucson.  We continue to
anticipate  an  improvement  in credit  ratings for Maricopa  County,  a primary
component  of the  state's  economy  that  appears to have  worked  through  the
problems of the early 1990s.

   Looking forward,  we have a positive view of Arizona municipal credit quality
based  on  the  state's  history  of  conservative  fiscal  management  and  our
expectation  that  the  state's  strong  economic  fundamentals  will  continue.
However,  Arizona's  rapid economic and population  growth will likely result in
the need for  large  capital  outlays.  The  state's  burgeoning  population  is
straining  infrastructure,  particularly  affecting  Arizona's  schools.  Future
credit  quality  will depend to a large  extent on the  state's and  localities'
ability to manage capital plans and debt issuance.

[line graph data]

Arizona Retail Sales and Residential Building Permits

Retail Sales (left scale, in billions of $)

1986     87.47
1987     93.06
1988     98.35
1989     97.18
1990     102.26
1991     101.85
1992     110.69
1993     115.61
1994     128.79
1995     130.07

Residential building permits (right scale, in thousands of units)


1986     60.43
1987     39.64
1988     32.53
1989     23.32
1990     22.88
1991     23.42
1992     31.37
1993     38.38
1994     51.02
1995     52.65

Source: DRI/McGraw Hill

4     Arizona Municipal Credit Review               American Century Investments
<TABLE>
<CAPTION>

                       ARIZONA INTERMEDIATE-TERM MUNICIPAL




                                             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 YIELD (as of November 30, 1996)
<S>                                           <C>           <C>           <C>            <C>         <C>  
   Arizona Intermediate-Term Municipal        3.97%         5.76%         6.01%          6.07%       6.54%


                                                                       6 MONTHS(2)     1 YEAR     LIFE OF FUND(3)


 AVERAGE ANNUAL RETURNS (as of November 30, 1996)(1)
   Arizona Intermediate-Term Municipal ................................   4.79%          4.91%       6.95%
   Lehman 5-Year General Obligation Index(4) ..........................   4.74%          5.37%       6.57%
   Average Other States Intermediate Municipal Fund(5) ................   4.76%          4.29%       6.18%
   Fund's Ranking Among Other States Intermediate Municipal Funds(6) ..    --      10 out of 67  1 out of 52

(1)  Returns are defined in the Glossary on page 21.
(2)  Not annualized.
(3)  From 4/30/94 to 11/30/96. (Inception date was April 11, 1994.)
(4)  See page 20 for more information about this comparative index.
(5)  According to Lipper Analytical Services. See page 20 for more information about Lipper and the fund's category.
(6)  Rankings determined by Lipper based on average annual returns for the periods indicated.
</TABLE>

[line graph - data below]

Growth of $10,000 Over the Life of the Fund

                  Arizona Intermediate-Term          Leman 5-Year GO
   4/30/94       $10000                             $10000
   5/31/94        10092                              10056
   6/30/94        10064                              10033
   7/31/94        10234                              10142
   8/31/94        10280                              10191
   9/30/94        10202                              10114
   10/31/94       10083                              10058
   11/30/94       9973                               9993
   12/31/94       10098                              10081
   1/31/95        10268                              10178
   2/28/95        10443                              10326
   3/31/95        10562                              10490
   4/30/95        10625                              10518
   5/31/95        10852                              10749
   6/30/95        10855                              10757
   7/31/95        10985                              10908
   8/31/95        11085                              11018
   9/30/95        11130                              11051
   10/31/95       11233                              11097
   11/30/95       11343                              11192
   12/31/95       11426                              11253
   1/31/96        11574                              11387
   2/29/96        11541                              11349
   3/31/96        11365                              11288
   4/30/96        11378                              11271
   5/31/96        11357                              11258
   6/30/96        11428                              11338
   7/31/96        11540                              11413
   8/31/96        11539                              11436
   9/30/96        11614                              11522
   10/31/96       11724                              11629
   11/30/96       11899                              11791

   Value on 11/30/96
   Arizona Intermediate-Term $11,899

   Lehman  5-Year GO $11,791

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 chart begins on 4/30/94 because it is the date closest to the
fund's 4/11/94 inception date for which index return data is 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
                              11/30/96     5/31/96
Number of Issues                 35          34
Average Duration             5.42 years  5.42 years
Weighted Average Maturity    7.53 years  7.12 years
Expense Ratio                  0.66%*       0.50%

* Annualized.

See the Glossary on page 21.

Semiannual Report                      Arizona Intermediate-Term Municipal     5


                       ARIZONA INTERMEDIATE-TERM MUNICIPAL


Management Q & A


   An interview with Colleen Denzler, Senior Municipal Portfolio Manager.


How did the Fund perform?

   The fund performed  slightly above average  compared with its peers.  For the
six-month  period ended  November  30, 1996,  the fund's total return was 4.79%,
compared  with the 4.76%  average  return of the 67 "Other  States  Intermediate
Municipal Debt Funds"  tracked by Lipper  Analytical  Services.  From a one-year
perspective,  the fund's performance was even stronger,  allowing it to place in
the top 15% of its  peers.  However,  please  keep in mind that a portion of the
fund's expenses were absorbed by Benham Management Corporation during the period
and that the  rankings  listed  would have been lower if the fund's  returns had
been reduced by those expenses.+


How did you position the fund during the period?

   With the  possibility  of a  short-term  interest  rate  hike by the  Federal
Reserve  a  palpable  concern  during  much of the  period,  we kept the  fund's
duration within a narrow range of 5.2-5.4 years, roughly neutral compared to the
fund's peers. In addition to this neutral stance,  we maintained a bias toward a
ladder portfolio structure,  thereby spreading the securities in the fund across
the bond-maturity spectrum.


Was  this  neutral   positioning  the  main  reason  why  the  fund's  six-month
performance was about average?

   Yes.  We tend to avoid  making  interest  rate bets  that can cause  unwanted
volatility in the fund's returns.  Rather than looking to add incremental return
through aggressive  duration management as some of our competitors choose to do,
we look to add value to the fund's  returns by searching for what we believe are
undervalued securities with the potential to appreciate.


Was  the  municipal   credit  research  team   instrumental  in  locating  these
undervalued securities?

   That's  correct.  Our strong  credit  research  staff  continued to make many
accurate assessments of specific credit situations in Arizona. The credit team's
diligent  efforts  led to the  purchase  of  many  undervalued  securities  that
subsequently appreciated in value.


[bar graph - data below]

ARIZONA INTERMEDIATE-TERM MUNICIPAL
   FISCAL YEAR-BY-YEAR RETURNS (Years ended May 31)

                  Arizona Intermediate-Term Municipal         Lehman 5-Year GO
   1994*          0.92%                                       0.56%
   1995           7.52%                                       6.89%
   1996           4.65%                                       4.74%

 *From 4/29/94 to 5/31/94.

 This chart  illustrates  the historical  year-by-year  volatility of the fund's
 return.  The fund's total  returns for the 1996 fiscal year  include  operating
 expenses,  while the  comparative  index's  returns  do not.  See page 20 for a
 definition of the fund's comparative index.

+ Benham  Management  Corporation  absorbed the fund's expenses through December
  31, 1995. As of January 1, 1996, the fund began  absorbing  expenses at a rate
  of an  additional  .10% of average  daily net assets each month and  continued
  until the fund reached its contractual expense cap of .67% in July 1996.

6     Arizona Intermediate-Term Municipal           American Century Investments



                       ARIZONA INTERMEDIATE-TERM MUNICIPAL


Each January,  the fund  receives a notable jump in cash  inflows.  Is there any
particular reason why this occurs?

   Many of the  Arizona  munis in the fund's  portfolio  make  their  semiannual
interest payments in January and July,  thereby  increasing the cash coming into
the fund during these months.  Although Arizona in particular  issues more munis
that pay coupons on a  January/July  cycle than many  states,  nearly 30% of all
outstanding munis pay coupons on this cycle.


What steps do you usually take to prepare for this event?

   One of our main goals  prior to  January  of every  year is to  significantly
reduce the fund's  cash  holdings.  In  January,  as the coupon  payments  begin
flowing  into the fund,  our cash  supplies  have been  replenished.  Since many
Arizona muni  investors  reinvest  their  interest  payments in the muni market,
demand for Arizona munis increases  during January,  often driving prices higher
for a brief period of time. Therefore, instead of immediately using the money to
buy  munis  at  inflated  prices,  we wait  until  some of the  seasonal  demand
subsides, putting the cash inflows to better use.


What are your plans for the fund going forward?

   Recently, economic evidence concerning the state of the U.S. economy has been
mixed,  and  concern  over  rising  interest  rates  is  again  evident  in  the
marketplace.  As a result,  we will likely  maintain the fund's neutral  stance,
lengthening or shortening  the fund's average  maturity and duration in a narrow
range around this position when appropriate. If the economic outlook does change
significantly,  we  believe  the  fund is  positioned  to  respond  quickly.  In
addition,  we will continue to utilize our strong credit research team to search
for  securities  with  undervalued  credit  ratings  that we  believe  have  the
potential to appreciate in value.

[pie charts]

   PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 11/30/96)

          Revenue 41%
          GO 34%
          COP 12%
          Prerefunded 11%
          Other 2%

   PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 5/31/96)

          GO 42%
          Revenue 34%
          Prerefunded 7%
          Other 17%

   PORTFOLIO COMPOSITION BY CREDIT RATING (as of 11/30/96)

          AAA 65%
          AA 24%
          A 5%
          BBB 6%

   PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/96)
          AAA 59%
          AA 31%
          A 4%
          BBB 6%

Investment terms are defined in the Glossary on page 21.


Semiannual Report                      Arizona Intermediate-Term Municipal     7


                             SCHEDULE OF INVESTMENTS
                       ARIZONA INTERMEDIATE-TERM MUNICIPAL

NOVEMBER 30, 1996 (UNAUDITED)

Principal Amount                        ($ in Thousands)
- --------------------------------------------------------------------------------


 MUNICIPAL BONDS

ARIZONA--89.1%
$  1,000 Arizona State Transportation Board
           Highway Rev., 5.25%, 7-1-09         $1,032
   1,000 Arizona   Transportation   Board  
           Excise  Tax  Rev.,  7.00%,  7-1-99,
           Prerefunded at 102% of Par (MBIA)(1) 1,090
     500 City of Mesa Utility Systems Rev., 6.25%,
           7-1-04 (FGIC)                          555
     900 Coconino-Yavapai County's Sedona
           Unified School District No. 9 GO,
           5.60%, 7-1-06 (FGIC)                   947
     545 Gilbert County GO, Series 1994 C,
           6.00%, 7-1-02 (MBIA)                   590
     500 Maricopa County GO, 6.25%, 7-1-03
           (FGIC)                                 552
     500 Maricopa County Industrial Development
           Auth. Hospital Facility Rev., (Samaritan
           Health Services), 7.15%, 12-1-04
           (FGIC)                                 581
   1,000 Maricopa County Public Financing
           Corporation COP, Series 1994,
           5.625%, 6-1-00                       1,028
     500 Maricopa County Unified School District
            No. 4  Mesa  GO, 5.20%, 7-1-06
           (FGIC)                                 520
     500 Maricopa County Unified School District
           No. 6 Washington Elementary,
           Series A, 6.75%, 7-1-03 (AMBAC)        566
     500 Maricopa County Unified School District
           No. 40 Glendale, 5.70%, 7-1-04 (FSA)   537
   1,000 Maricopa County Unified School District
           No. 41 Gilbert GO, Series 1988 F,
           6.20%, 7-1-02, Prerefunded at Par
           (FGIC)(1)                            1,089
     600 Maricopa County Unified School District
           No. 48 Scottsdale GO, 5.00%, 7-1-09    601
   1,000 Maricopa County Unified School District
           No. 97 Deer Valley GO, Series A,
           6.25%, 7-1-06 (MBIA)                 1,109
     300 Phoenix Airport Rev., Series 1994 C,
           5.50%, 7-1-01 (MBIA)                   313


                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

     635 Phoenix Civic Improvement Corp.
           Wastewater Rev., 6.125%, 7-1-03,
           Prerefunded at 102% of Par(1)    $     704
   1,000 Phoenix Civic Improvement Corp.
           Wastewater Rev., 4.85%,
           7-1-07 (MBIA)                          997
     500 Phoenix Civic Improvement Corp.
           Water Systems Rev., 6.00%,
           7-1-02                                 538
     550 Phoenix GO, Series 1992, 6.00%,
           7-1-01                                 591
     350 Phoenix Street and Highway Rev.,
           Series 1992, 6.25%, 7-1-06             381
     500 Phoenix Street and Highway Rev.,
           Series 1992, 5.95%, 7-1-00             529
   1,000 Pima County Sewer Rev., Series 1991,
           6.20%, 7-1-00 (FGIC)                 1,068
   1,000 Pima County Unified School District
           No. 10, Amphitheater GO, 7.00%,
           7-1-05 (MBIA)                        1,167
     915 Pinal County Unified School District
           No. 43 Apache Junction GO,
           Series A, 6.80%, 7-1-08 (FGIC)       1,068
   1,000 Salt River Project Agricultural
           Improvement and Power District,
           Series B, 6.50%, 1-1-04              1,118
     800 Salt River Project Agricultural
           Improvement and Power District,
           Series A, 5.75%, 1-1-07                862
     480 Scottsdale GO, Series 1994,
           7.50%, 7-1-02                          555
   1,275 Tempe GO, 6.25%, 7-1-05                1,426
     200 Tucson Street and Highway Rev.,
           4.50%, 7-1-98                          202
   1,000 Tucson Street and Highway Rev.,
           Series 1992, 5.70%, 7-1-01           1,056
     500 Yavapai County Camp Verde Unified
           School District No. 28 GO,
           Series 1995, 6.10%, 7-1-04 (FGIC)      551
                                               ------   
                                               23,923
                                               ------

GUAM--1.9%
     500 Guam Power Auth. Rev., Series 1994 A,
           5.20%, 10-1-97                         506
                                               ------
   
See Notes to Financial Statements


8     Arizona Intermediate-Term Municipal           American Century Investments



                             SCHEDULE OF INVESTMENTS
                       ARIZONA INTERMEDIATE-TERM MUNICIPAL

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

PUERTO RICO--9.0%
   1,000 Puerto Rico Electric Power Auth.,
           Series 1995 W Rev.,
           6.00%, 7-1-03 (MBIA)             $   1,094
   1,000 Puerto Rico Public Building Auth. Rev.,
           Series A, 6.25%, 7-1-08 (AMBAC)      1,127
     200 Puerto Rico Public Education and Health
           Rev., 7.60%, 7-1-97, Prerefunded at
           102% of Par (FGIC)(1)                  209
                                                -----
                                                2,430
                                                -----

TOTAL INVESTMENT SECURITIES--100.0%          $26,859(2)
   (Cost $25,918)                            ========= 


Notes to Schedule of Investments
AMBAC = AMBAC Indemnity Corp.
COP = Certificate of Participation
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)  The Fund had 1.2% invested in private activity  municipal  securities.  The
     interest  from these  securities  is treated  as a tax  preference  item in
     calculating federal alternative minimum tax liability.

See Notes to Financial Statements

Semiannual Report                      Arizona Intermediate-Term Municipal     9


                       STATEMENT OF ASSETS AND LIABILITIES

NOVEMBER 30, 1996 (UNAUDITED)
                                 
 ASSETS                                                          $ In Thousands

Investment securities, at value (identified cost of $25,918) ..... $    26,859
Interest receivable ..............................................         683
Prepaid expenses and other assets ................................           3
                                                                   -----------
                                                                        27,545
                                                                   -----------

 LIABILITIES
Disbursements in excess of demand deposit cash ...................          83
Payable for shares redeemed ......................................          19
Dividends payable ................................................           3
Payable to affiliates (Note 2) ...................................          15
                                                                   -----------
                                                                           120
                                                                   -----------
Net Assets Applicable to Outstanding Shares ...................... $    27,425
                                                                   ===========

 CAPITAL SHARES, $10.00 PAR VALUE
Outstanding (Unlimited number of shares authorized) 
  (in thousands) .................................................       2,595
                                                                         =====
Net Asset Value Per Share ........................................ $     10.57
                                                                   ===========

 NET ASSETS CONSIST OF:
Capital (par value and paid-in surplus) .......................... $    26,490
Accumulated net realized (loss) on investment transactions .......         (6)
Net unrealized appreciation on investments (Note 3) ..............         941
                                                                   -----------
                                                                   $    27,425
                                                                   ===========

See Notes to Financial Statements

10    Statement of Assets and Liabilities           American Century Investments



                             STATEMENT OF OPERATIONS

SIX MONTHS ENDED NOVEMBER 30, 1996 (UNAUDITED)

                                 


 INVESTMENT INCOME                                             $ In Thousands
Income:
Interest ..................................................... $       668
                                                               -----------

Expenses (Note 2):
Investment advisory fees .....................................          57
Administrative fees ..........................................          13
Transfer agency fees .........................................          10
Printing and postage .........................................           7
Auditing and legal fees ......................................           5
Custodian fees ...............................................           4
Registration and filing fees .................................           4
Directors' fees and expenses .................................           1
Other operating expenses .....................................           6
                                                                        --   
  Total expenses .............................................         107
Amount waived (Note 2) .......................................        (20)
Custodian earnings credits (Note 4) ..........................         (1)
                                                                        -- 
  Net expenses ...............................................          86
                                                                        --
Net investment income ........................................         582
                                                                       ---

 REALIZED AND UNREALIZED GAIN

 ON INVESTMENTS (Note 3)
Net realized gain on investments .............................           7
Change in net unrealized appreciation on investments .........         635
                                                                       ---
Net realized and unrealized
gain on investments ..........................................         642
                                                                       ---
Net Increase in Net Assets
Resulting from Operations .................................... $     1,224
                                                               ===========

See Notes to Financial Statements

Semiannual Report                                  Statement of Operations    11

<TABLE>
<CAPTION>

                       STATEMENTS OF CHANGES IN NET ASSETS

SIX MONTHS ENDED NOVEMBER 30, 1996 (UNAUDITED) AND
YEAR ENDED MAY 31, 1996

                                                                                     November 30,        May 31,
Increase in Net Assets                                                                   1996             1996

                                

 OPERATIONS                                                                                $ In Thousands

<S>                                                                                <C>              <C>        
Net investment income ............................................................ $        582     $     1,131
Net realized gain on investment transactions .....................................            7              88
Change in net unrealized appreciation (depreciation) on investments ..............          635           (277)
                                                                                            ---           ---- 
Net increase in net assets resulting from operations .............................        1,224             942
                                                                                          -----             ---


 DISTRIBUTIONS TO SHAREHOLDERS
From net investment income .......................................................        (582)         (1,130)
From net realized gains from investment transactions .............................           --            (13)
                                                                                          ----          ------ 
Decrease in net assets from distributions ........................................        (582)         (1,143)
                                                                                          ----          ------ 


 CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ........................................................        4,414          11,716
Proceeds from reinvestment of distributions ......................................          446             885
Payments for shares redeemed .....................................................       (3,866)         (6,389)
                                                                                         ------          ------ 
Net increase in net assets from capital share transactions .......................          994           6,212
                                                                                            ---           -----

Net increase in net assets .......................................................        1,636           6,011


 NET ASSETS
Beginning of period ..............................................................       25,789          19,778
                                                                                         ------          ------

End of period .................................................................... $     27,425     $    25,789
                                                                                   ============     ===========


 TRANSACTIONS IN SHARES OF THE FUND: (In thousands)
Sold .............................................................................          425           1,117
Issued in reinvestment of distributions ..........................................           43              85
Redeemed .........................................................................         (373)           (612)
                                                                                           ----            ---- 
Net increase .....................................................................           95             590
                                                                                   ============     ===========
</TABLE>

See Notes to Financial Statements

12    Statements of Changes in Net Assets           American Century Investments


                          NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)


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 eight Funds composing 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.  Premium and original  issue
discount is amortized  daily using the effective  interest  rate method.  Market
discount is recognized as income upon the sale or maturity of the security.

   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.

   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  directors 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  option
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 change 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 unrealized gains and losses.  The Fund recognizes a realized gain or
loss when the contract is closed or expires.

   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.


Semiannual Report                            Notes to Financial Statements    13


                         NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)

- --------------------------------------------------------------------------------
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.

          .50% of the first $100  million  
          .45% of the next $100  million     
          .40% of the next $100  million  
          .35% of the next $100  million 
          .30% of the next $100  million  
          .25% of the next $1 billion  
          .24% of the next $1 billion
          .23% of the next $1  billion  
          .22% of the next $1  billion  
          .21% of the next $1 billion 
          .20% of the next $1 billion
          .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 agreement was formerly with
Benham Financial Services, Inc.

   The  Trust  has an  additional  agreement  with BMC  pursuant  to  which  BMC
established a contractual expense guarantee that limits Fund expenses (excluding
expenses such as brokerage  commissions,  taxes,  interest,  custodian  earnings
credits,  and  extraordinary  expenses)  to .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.  The
expense  guarantee  rate is subject to  renewal  in June 1997.  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 .10% of average  daily
closing net assets per month until the Fund reached the contractual expense rate
of .67%.

   The  payable  to  affiliates  as of  November  30,  1996,  based on the above
agreements, was as follows:

Investment Advisor ......................... $10,116
Administrative Services ....................   3,729
Transfer Agent .............................     737
                                             -------
                                             $14,582
                                            ========

   The Trust has a distribution  agreement with ACIS,  which is responsible  for
promoting  sales of and  distributing  the Trust's  shares.  This  agreement was
formerly with Benham Distributors, Inc.

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

   The aggregate cost of municipal debt obligations  purchased and proceeds from
sales (excluding  short-term  investments) for the six months ended November 30,
1996, for the Fund totaled $10,306,297 and $8,903,542, respectively.

   As  of  November  30,  1996,  accumulated  net  unrealized  appreciation  was
$940,919,  consisting of unrealized  appreciation  of $940,919,  and  unrealized
depreciation  of $0. 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


                         NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)

- --------------------------------------------------------------------------------
4. Expense Offset Arrangements


   The Fund's Statement of Operations reflects custodian earnings credits.  This
amount is used to offset the custody fees  payable by the Fund to the  custodian
bank.  The credits are earned  when the Fund  maintains a balance of  uninvested
cash at the  custodian  bank.  Beginning  with the year ended May 31, 1996,  the
ratio of  operating  expenses  to  average  net  assets  shown in the  Financial
Highlights is calculated as if these credits had not been earned.


- --------------------------------------------------------------------------------
5. Subsequent Events

   The following name changes became effective January 1, 1997:
<TABLE>


                        NEW NAMES                                   FORMER NAMES
<S>                      <C>                                        <C>  
   Fund's Issuer:       American Century Municipal Trust            Benham Municipal Trust
   Fund:                American Century - Benham Arizona           Benham Arizona Municipal Intermediate-Term Fund
                        Intermediate-Term Municipal Fund
   Parent Company:      American Century Companies, Inc.            Twentieth Century Companies, Inc.

   Distributor:         American Century Investment Services, Inc.  Twentieth Century Securities, Inc.
   Transfer Agent:      American Century Services Corporation       Twentieth Century Services, Inc.
</TABLE>


Semiannual Report                            Notes to Financial Statements    15
<TABLE>
<CAPTION>

                              FINANCIAL HIGHLIGHTS
                       ARIZONA INTERMEDIATE-TERM MUNICIPAL

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

                                                                           1996(1)           1996            1995          1994(2)


 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 .......................................              .23                .51             .51            .07
  Net Realized and Unrealized Gain (Loss) on Investments ......              .26               (.03)            .22            .13
                                                                             ---               ----             ---            ---
  Total from Investment Operations ............................              .49                .48             .73            .20
                                                                             ---                ---             ---            ---
Distributions
  From Net Investment Income ..................................             (.23)              (.51)           (.51)          (.07)
  From Net Realized Gains on Investment Transactions ..........               --               (.01)             --             --
                                                                            ----               ----            ----           ----
  Total Distributions .........................................             (.23)              (.52)           (.51)          (.07)
                                                                            ----               ----            ----           ---- 
Net Asset Value, End of Period ................................    $       10.57      $       10.31   $       10.35   $      10.13
                                                                   =============      =============   =============   ============
  Total Return(3) .............................................             4.79%              4.65%           7.52%          1.99%


 RATIOS/SUPPLEMENTAL DATA
  Ratio of Operating Expenses to Average Net Assets(4) ........              .66%(5)            .14%            --             --
  Ratio of Operating Expenses to Average
     Net Assets (Before Reimbursement)(4) .....................              .81%(5)            .82%           1.01%        2.33%(5)
  Ratio of Net Investment Income
     to Average Net Assets(4) .................................             4.38%(5)           4.85%           5.16%        5.08%(5)
  Ratio of Net Investment Income to Average
     Net Assets (Before Reimbursement)(4) .....................             4.23%(5)           4.17%           4.15%        2.75%(5)
  Portfolio Turnover Rate .....................................            34.58%             35.78%          33.22%         18.14%
  Net Assets, End of Period (in thousands) ....................        $   27,425         $   25,789      $   19,778      $   7,187

(1)  Six months ended November 30, 1996.
(2)  From April 11, 1994 (commencement of operations) through May 31, 1994.
(3)  Total return assumes reinvestment of dividends and capital gain distributions, if any. Total returns for periods less than one
     year are not annualized.
(4)  The ratios for the periods subsequent to May 31, 1995, include expenses paid through expense offset arrangements.
(5)  Annualized.
</TABLE>

See Notes to Financial Statements

16    Financial Highlights                          American Century Investments

                                      NOTES

Semiannual Report                                                    Notes    17

                                      NOTES

18    Notes                                         American Century Investments

                                      NOTES

Semiannual Report                                                    Notes    19

                             BACKGROUND INFORMATION


Investment Objectives & Policies

   American Century Investments offers 41 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

   Arizona Intermediate-Term Municipal, which was established on April 11, 1994,
seeks to  obtain as high a level of  current  income  exempt  from  Arizona  and
regular federal income tax as is consistent with prudent  investment  management
and  conservation  of  shareholders'  capital.  The fund  invests  primarily  in
intermediate-term  Arizona municipal obligations with maturities of four or more
years and maintains a weighted average portfolio  maturity of five to ten years.
The fund  will  invest  at least  65% of its net  assets  in  Arizona  municipal
obligations.  The remaining 35% of net assets may be invested in (1) obligations
issued by other states and their political subdivisions,  (2) obligations issued
by U.S.  territories or possessions such as Puerto Rico, and (3) U.S. government
securities.

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 Lipper Other States  Intermediate  Municipal  Debt Funds Index invests in
municipal debt issues with  dollar-weighted  average maturities of 5 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

20    Background Information                        American Century Investments


                                    GLOSSARY


Returns

   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.

   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.



Bond Portfolio Structures

   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.)

   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).

   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

   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%).

   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.
Most "normal"  yield curves start in the lower left corner of the graph and rise
to the upper right corner,  indicating that yields rise as maturities  lengthen.
This   upward   sloping   yield   curve   illustrates   a   normal   risk/return
relationship--more return (yield) for more risk (a longer maturity). Conversely,
a "flat" yield curve provides little or no extra return for taking on more risk.



Statistical Terminology

   Market Value--the market value of a fund's investments on a given date.

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

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

   Average Duration--measures the interest rate sensitivity of a bond portfolio.
Average  duration,  measured in years,  represents  the  approximate  percentage
change in the value of a bond portfolio if interest rates move up or down by one
percentage point.  Therefore,  longer portfolio durations typically mean greater
sensitivity to changes in interest rates.



Types of Municipal Securities

   Certificates  of  Participation  (COP)--securities  issued to finance  public
property improvements (such as city halls and police stations).

   General Obligation (GO)  Bonds--securities  backed by the taxing power of the
issuer.

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

   Prerefunded  Bonds--securities  refinanced  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.

   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).



Yields

   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.


Semiannual Report                                                 Glossary    21


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   American
   Century(sm)

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

   Person-to-Person Assistance:
   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 816-753-1865

   Fax: 816-340-7962

   Internet: www.americancentury.com



   American Century Municipal Trust

   Investment Manager
   Benham Management Corporation
   Mountain View, California

   This report and the financial  statements  contained herein 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.


   9701             [recycle logo]
   SH-BKT-6150         Recycled




                                   [Book Two]



                                SEMIANNUAL REPORT
                                NOVEMBER 30, 1996

                            [american century logo]
                                    American
                                  Century(sm)

                                     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 Overview ..................4
Florida Municipal Money Market
     Performance Information .......................5
     Management Q & A ..............................6
     Schedule of Investments .......................8
     Financial Highlights .........................22
Florida Intermediate-Term Municipal
     Performance Information ......................11
     Management Q & A .............................12
     Schedule of Investments ......................14
     Financial Highlights .........................23
Statements of Assets and Liabilities ..............16
Statements of Operations ..........................17
Statements of Changes in Net Assets ...............18
Notes to Financial Statements .....................19
Background Information
     Investment Objectives & Policies .............24
     Comparative Indices ..........................24
     Lipper Rankings ..............................24
Glossary ..........................................25

   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,  American  Century  funds have
been divided 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              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  expanded  at a modest,  non-inflationary  pace  during the
   twelve months ended November 30, 1996. As a result,  the U.S. Federal Reserve
   has held short-term interest rates steady since February 1996.

o  Municipal  securities (munis) performed favorably during the six months ended
   November 30, 1996. Low issuance  supported munis by damping market volatility
   and keeping bond prices relatively stable.

Credit Review

o  Florida's  economy  saw steady  expansion  through  1996.  Population  growth
   continued at a rapid pace.

o  Unemployment  in the state fell to 5.1% in October  (lower than the  national
   rate of 5.2%).

o  A  rapidly  growing  population  has  increased  the need for  infrastructure
   improvements.  Large  capital  outlays  will be needed to expand the  state's
   overcrowded school system.

o  Our outlook for  Florida's  credit  quality is  optimistic.  We expect to see
   stable credit quality for the state over the next two to three years.

Municipal Money Market

o  The fund  outperformed its Lipper peer group average for the six months ended
   November 30, 1996.

o  Beginning January 1, 1997,  management fees will be phased in at a rate of 10
   basis points each month until the 61-basis-point expense cap is reached.

Intermediate-Term Municipal

o  The fund  slightly  outperformed  its Lipper  peer group  average for the six
   months ended November 30, 1996.

o  We  extended  the fund's  duration  near the end of the period to prepare for
   heavier cash inflows typically seen in December.

o  Going forward,  barring a significant change in economic conditions,  we will
   likely  maintain the fund's current  neutral  posture,  adjusting its average
   maturity as conditions warrant.


                                    Municipal
                                  Money Market

                          Total Returns:AS OF 11/30/96
                                 6 Months 1.79%*
                                  1 Year 3.69%

                           Net Assets:$142.7 million
                                (AS OF 11/30/96)

                            Inception Date: 4/11/94

                              Ticker Symbol: BEFXX



                           Intermediate-Term Municipal

                          Total Returns:AS OF 11/30/96
                                 6 Months 4.59%*
                                  1 Year 4.61%

                            Net Assets:$10.9 million
                                (AS OF 11/30/96)

                            Inception Date: 4/11/94


                               * Not annualized.

Semiannual Report                                      Report Highlights       1


                               OUR MESSAGE TO YOU

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

   The six months ended November 30, 1996, were eventful,  both in the U.S. bond
market and at our company. After a rocky period in the first half of 1996, bonds
stabilized  during the summer and enjoyed a rebound in October and November.  In
the following  pages,  our investment  management team provides  further details
about the market and how your fund was managed during the period.

   Changing market conditions  underscore the importance of quality investments.
Our  commitment to quality  securities is  exemplified  by our municipal  credit
research team. The three members of the team carry out in-depth  analysis on all
securities  considered for purchase by American  Century  municipal money market
and bond funds.  The team recently  established a new credit  management  system
that defines investment limits to cap our funds' exposure to individual issuers,
sectors and regions.

   On the corporate front, we completed the operational integration of Twentieth
Century  and The Benham  Group in  September.  As a result,  you now have direct
access to a broader spectrum of funds and services.

   We also changed the name of our company. On January 1, 1997, we began serving
you as American Century  Investments,  which reflects our expanded  identity and
the  independent  thinking  common to  Twentieth  Century and  Benham.  American
Century's  fund  family is divided  into three  groups--the  Benham  Group,  the
American Century Group and the Twentieth  Century Group.  The Florida  Municipal
funds will remain in the Benham Group,  reflecting their continued  adherence to
the fixed-income investment approach that we have employed for years.

   This report is the first in a new format  designed using your input.  We hope
you find it more informative and easier to read. Another informative resource is
the American Century Web site. If you use a personal  computer and have Internet
access,  we've made it easier for you to  download  information  about  American
Century funds and access your fund  accounts.  With a personal  access code, you
can view account  balances,  exchange money between  existing  accounts and make
additional investments. The Web site address is: www.americancentury.com. We are
one of the first fund  companies to offer direct  on-line  transactions  via the
Internet.

   These are  examples  of how we continue  to work to provide  information  and
services that are useful and convenient to investors in our funds. Thank you for
investing with us.

Sincerely,

/s/James E. Stowers III
James E. Stowers III
President and Chief Executive Officer
American Century Companies

/s/James M. Benham
James M. Benham
Vice Chairman
American Century Companies

2    Our Message To You                           American Century Investments


                                 PERIOD OVERVIEW

U.S. Economy

   During the six months ended November 30, 1996, the U.S. economy  continued to
rebound from slow growth during 1995 and early 1996. An improving retail sector,
surging auto sales and a resilient  housing  market helped the economy expand at
an  impressive  4.7%  annual  rate in the second  quarter of 1996.  The  economy
remained  strong  throughout  the summer as healthy  employment  growth sent the
national  unemployment rate to a six-year low of 5.1% by August.  However,  this
trend  appeared to reverse  itself late in the period--  third-quarter  economic
growth slowed to a more sedate 2.1% annual pace.

   In spite of the second-quarter surge in growth, inflation remained tame. From
the start of 1996 through November, inflation (as measured by the consumer price
index)  grew at an annual  rate of 3.3%.  In light of this lack of  inflationary
pressure, the Fed held short-term interest rates steady throughout the six-month
period.

[line graph - data described below]

U.S. Municipal Bond Market

   Overall,  the six-month  period ended  November 30, 1996, was a favorable one
for municipal bonds (munis). The accompanying muni yield curve graph depicts how
the muni yield curve shifted lower throughout the period.  Although munis traded
listlessly throughout the summer,  reflecting the market's uncertainty about the
strength of the U.S. economy, munis outperformed Treasury securities (Treasurys)
between mid-June and late August. By late September, the outlook for munis began
to  change.  Continued  signs of low  inflation,  stable  monetary  policy,  and
expectations of a status quo election year ignited a substantial market rebound,
which continued through October and November. As is often the case when interest
rates are falling rapidly, munis underperformed Treasurys.

   Muni yields declined  significantly  during the six-month  period.  Yields on
shorter-term  munis fell more than 30 basis points,  while yields on longer-term
munis dropped by about 50 basis points.

   Historically  low issuance of new munis,  especially  among  shorter-maturity
securities,  continued to support muni prices.  While 1996 muni issuance through
November was slightly higher than 1995 levels,  the limited supply helped dampen
market  volatility  and  keep  prices  relatively  stable.  Although  some  muni
refunding  activity  occurred when interest  rates fell late in the period,  the
refundings had little impact on bond prices.

   Looking forward,  more recent data have provided enough conflicting  evidence
to  cause  considerable  uncertainty  about  the rate of U.S.  economic  growth.
Despite this concern,  there are many positive  factors working in munis' favor.
One is muni issuance, which should remain at historically low levels in the near
term.  Barring a significant  decrease in interest rates, muni refundings should
also remain tame.  In addition,  the reduced  likelihood of major tax reform and
the possibility for further reductions to the budget deficit improve the outlook
for munis.

Investment terms are defined in the Glossary on page 25.

[line graph data]
   Municipal Yield Curve

   Years          11/29/96          8/26/96          6/14/96
   1              3.46%             3.8%             3.76%
   2              3.76              4.05             4.25
   3              3.96              4.25             4.47
   4              4.08              4.4              4.62
   5              4.18              4.5              4.74
   6              4.28              4.6              4.84
   7              4.38              4.7              4.94
   8              4.48              4.8              5.04
   9              4.58              4.9              5.14
   10             4.68              5                5.24
   11             4.768             5.082            5.33
   12             4.856             5.164            5.42
   13             4.944             5.246            5.51
   14             5.032             5.328            5.6
   15             5.12              5.41             5.69
   16             5.148             5.444            5.724
   17             5.176             5.478            5.758
   18             5.204             5.512            5.792
   19             5.232             5.546            5.826
   20             5.26              5.58             5.86
   21             5.268             5.588            5.868
   22             5.276             5.596            5.876
   23             5.284             5.604            5.884
   24             5.292             5.612            5.892
   25             5.3               5.62             5.9
   26             5.304             5.624            5.904
   27             5.308             5.628            5.908
   28             5.312             5.632            5.912
   29             5.316             5.636            5.916
   30             5.32              5.64             5.92


Semiannual Report                                      Period Overview         3



                        FLORIDA MUNICIPAL CREDIT OVERVIEW

   Florida's  economy saw steady  expansion as 1996 drew to a close.  Population
growth  continued at a rapid pace as migration into the state  remained  strong.
International  trade and tourism  continued to play pivotal roles in the state's
economic health.  On the  international  trade side, the state is geographically
well-positioned  to  benefit  from the  growth of the  emerging  markets  of the
Caribbean and Central and South  America.  The state's  location also makes it a
popular tourist  destination-- nearly 42.3 million tourists visited the state in
1996, a 1.3% increase  over 1995. It is estimated  that that figure will jump to
nearly 44 million in 1997.

   Along with  Georgia,  Florida  leads the  southeastern  United  States in job
growth. In spite of a 30% increase in its prime working-age  population over the
past 10 years,  Florida's unemployment rate continues to trend downward (see the
accompanying  graph).  Between  October  1995  and  October  1996,  the  state's
unemployment  rate fell from 5.6% to 5.1%--lower than the national rate of 5.2%.
In addition,  per capita income in the state has risen almost 20% faster than in
the nation as a whole.

[line graph - data described below]

   Though  these  factors have  increased  the state's tax  revenues,  Florida's
booming   population  has  brought  other  problems,   including  the  need  for
significant infrastructure improvements. Overcrowding in Florida's public school
system--already  one of the largest in the  nation--is  another  issue that will
have to be addressed. Large capital outlays will be needed to prevent the system
from  falling  farther  behind  the  needs  of  its  approximately  two  million
school-aged children.

   Running counter to these needs is a growing anti-tax sentiment,  demonstrated
over the past few years by Florida voters'  reluctance to approve new government
spending.  As a result,  many schools have had to revise their capital planning,
putting pressure on school districts' operating budgets.

   Another  problem  facing  the state is a budget  crisis in Miami  that  could
potentially impact some of the city's $423 million in outstanding municipal bond
issues. However, since action is being taken at the city and state levels, we do
not anticipate  that there will be any significant  impact on Florida's  overall
credit  quality in the near term.  The Benham  Florida  municipal  funds have no
exposure to bonds issued by the city of Miami.

   In spite of these  negative  factors,  our  outlook  for the  state's  credit
quality  is  optimistic.  The  state  and its  municipalities  follow  generally
conservative  fiscal  practices,  and we expect to see stable credit quality for
the state over the next two to three years.

[line graph data]

   FLORIDA UNEMPLOYMENT RATE

   3/31/93        7.1%
   6/30/93        7%
   9/30/93        6.9%
   12/31/93       7%
   3/31/94        6.9%
   6/30/94        6.7%
   9/30/94        6.4%
   12/31/94       .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%

4    Florida Municipal Credit Overview            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


 CURRENT YIELD (as of November 30, 1996)
<S>                             <C>           <C>           <C>           <C>           <C>            <C>  
   Municipal Money Market       3.60%         3.67%         5.00%         5.22%         5.63%          5.96%


                                                                       6 MONTHS(2)     1 YEAR     LIFE OF FUND(3)


 AVERAGE ANNUAL RETURNS (as of November 30, 1996)(1)
   Municipal Money Market ............................................    1.79%         3.69%          3.73%
   Average States Tax-Exempt Money Market Fund(4) ....................    1.53%         3.15%          3.23%
   Fund's Ranking Among States Tax-Exempt Money Market Funds(5) ......     --        1 out of 29    1 out of 17

(1)  Returns are defined in the Glossary on page 25.
(2)  Not annualized.
(3)  Data shown is for the period from 4/30/94 to 11/30/96. The fund's inception date was April 11, 1994.
(4)  According to Lipper Analytical Services. See page 24 for more information about Lipper and the fund's category.
(5)  Rankings determined by Lipper based on average annual returns for the periods indicated.
</TABLE>


 PORTFOLIO AT A GLANCE
                           11/30/96    5/31/96
Number of Issues              63         55
Weighted Average Maturity   40 days    50 days
Expense Ratio                 0%*        0%*

* Until  December 31,  1996,  the fund's  management  fees were waived by Benham
Management Corporation (BMC). Beginning January 1, 1997, management fees will be
phased in at a rate of 10 basis  points  each  month  until  the  61-basis-point
expense cap is reached.

See the Glossary on page 25.

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.

Semiannual Report                            Florida Municipal Money Market    5


                         FLORIDA MUNICIPAL MONEY MARKET

Management Q & A

   An interview with Bryan Karcher, municipal portfolio manager.

How did the fund perform?

   The fund  continued  to  outperform  its peers,  returning  1.79% for the six
months ended November 30, 1996,  compared to the 1.53% average return for the 32
"States  Tax-Exempt Money Market Funds" tracked by Lipper  Analytical  Services.
For the fiscal year ended  November 30,  1996,  the fund ranked #1 in its Lipper
category.

   Shareholders  benefited from the fact that the fund's operating expenses were
absorbed and its management fees waived by Benham Management  Corporation (BMC).
The absence of these fees helped the fund achieve its #1 Lipper ranking.  If you
subtract the fund's expense cap of 61 basis points from its November 30 one-year
return of 3.69%, the resulting 3.08% return remains competitive, though slightly
lower than the 3.15% average return reported for its Lipper category.

How much longer will BMC continue to absorb the fund's expenses?

   Until  December 31, 1996 (not  January 31, 1997,  as stated in the fund's May
31,  1996  Annual  Report).  On  January  1, 1997 the fund will  begin to absorb
expenses  at a rate of an  additional  10 basis  points  each  month.  This will
continue until the fund reaches its contractual expense cap of 61 basis points.

How was the fund positioned during the six-month period?

   Because  there was so much  uncertainty  in the markets about the outlook for
short-term interest rates, we positioned the fund more defensively in comparison
to its peers.  For most of the period,  we kept the fund's  average  maturity at
around 35 days (about 15 days shorter than its peer-group  average).  During the
period,  yields on one-year  municipal  securities  fluctuated within a range of
about  3.55% to 3.95% as the  interest  rate  outlook  shifted  in  response  to
changing economic data. We watched for opportunities to add yield to the fund by
buying one-year paper whenever rates moved toward the higher end of this range.

[pie charts]

   PORTFOLIO  COMPOSITION BY SECURITY TYPE (as of 11/30/96) 

     VRDNs 72% 
     Commercial Paper 15% 
     Bonds less than 1 Year 13%

   PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 5/31/96)

     VRDNs 58%
     Commercial Paper 21%
     Bonds less than 1 Year 18%
     Other 3%

6    Florida Municipal Money Market               American Century Investments


                         FLORIDA MUNICIPAL MONEY MARKET

Each December the fund typically sees a notable jump in cash inflows. Why?

   Florida's  intangibles  tax is the driving  force behind the sudden influx of
cash. Each December,  investors look for Florida  state-issued  investments that
are not subject to the tax in order to shelter some of their money.  Because the
tax is  assessed on assets as of December  31,  investors  often wait until late
December to invest in sheltered securities.

How do you manage the sudden influx of cash?

   We  typically  put the new money into daily and weekly  variable-rate  demand
notes (VRDNs). These are highly liquid short-term securities that can be quickly
sold to meet  redemptions  that we  normally  see in  January,  when some of the
December inflows move back out of the fund.

Looking  further ahead,  are there any other  seasonal  factors to be taken into
account?

   Yes. In June and July, many municipal  money market issues mature,  resulting
in large  amounts of cash that need to be  reinvested.  The  resulting  surge in
demand  drives muni prices up and yields down.  To prepare for this  period,  we
typically buy  significant  amounts of commercial  paper in May, to lock in more
attractive yields and tide the fund over this "technical  period." As year's end
approaches,  we allow the fund's weighting of commercial paper to decrease as we
invest more of its assets in VRDNs,  whose yields  typically move higher at that
time.

Is there  any  chance  that the fund  could be  affected  by the  budget  crisis
unfolding  in Miami?  The city has over $400  million in  outstanding  municipal
bonds.

   There is no need for concern.  Thanks to the thorough research carried out by
our Municipal Credit Research Team, none of the Benham municipal funds own bonds
issued by the city of Miami.

What are your plans for the fund going forward?

   We don't  expect to make any  significant  strategy  shifts in the near term.
Throughout  December,  we will likely invest any incoming cash in VRDNs as their
yields become more attractive.  This will shorten the fund's average maturity by
several days. In January,  the seasonal rise in rates should reverse itself, and
we will sell off our daily VRDNs first to cover fund redemptions,  extending the
fund's average maturity slightly in the process.

[pie charts]

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

   PORTFOLIO  COMPOSITION  BY CREDIT RATING (as of 5/31/96) 
     SP1+ 76% 
     SP1 21% 
     SP2 3%

Investment terms are defined in the Glossary on page 25.

Semiannual Report                            Florida Municipal Money Market    7


                             SCHEDULE OF INVESTMENTS
                         FLORIDA MUNICIPAL MONEY MARKET

NOVEMBER 30, 1996 (UNAUDITED)

                                                  Value
   Principal Amount                          ($ in Thousands)
- --------------------------------------------------------------------------------


 MUNICIPAL BONDS
$  1,700 Brevard County Housing Finance Auth.
           Palm Place, VRDN, 3.60%, 12-4-96
           (LOC: Chemical Bank)                $1,700

   1,000 Broward County Housing Finance
           Auth. Multi-Family Housing Rev.,
           (Margate Project), VRDN, 3.60%,
           12-4-96 (LOC: Chemical Bank)         1,000

   3,500 Broward County Housing Finance
           Auth. Multi-Family Housing Rev.,
           Series A, (Palmaire Oxford), VRDN,
           3.80%, 12-4-96 (SBBPA: Continental
           Casualty Co.)                        3,500

   1,400 Broward County Housing Finance Auth.
           Multi-Family Housing Rev.,
           (Welleby Apartments), VRDN,
           3.65%, 12-4-96 (LOC: Bank of
           America)                             1,400

   1,200 Broward County Industrial Development
           Rev., (MDR Fitness Project), VRDN,
           3.65%, 12-4-96 (LOC: Suntrust Bank
           South Florida)                       1,200

   2,500 Broward County Industrial Development
           Rev., (HEICO), VRDN, 3.65%,
           12-4-96 (LOC: Suntrust Bank
           South Florida)                       2,500

   1,535 City of Jacksonville, 4.00%,
           10-1-97 (FGIC)                       1,537

   2,000 City of Naples Hospital Rev., (Naples
           Community Hospital), VRDN, 3.65%,
           12-5-96 (LOC: Mellon Bank N.A.)      2,000

   1,745 Collier County Housing Finance Auth.
           Multi-Family Housing Rev., VRDN,
           3.70%, 12-4-96 (LOC: PNC Bank
           Kentucky, Inc.)                      1,745

   1,910 Coral Springs Industrial Development
           Rev., (Royal Plastics Group Project),
           VRDN, 3.65%, 12-4-96 (LOC:
           Suntrust Bank South Florida, N.A.)   1,910

   3,200 Dade County Aviation Rev., Series A,
           VRDN, 3.80%, 12-4-96
           (LOC: Fuji Bank)                     3,200


                                                  Value
   Principal Amount                          ($ in Thousands)
- --------------------------------------------------------------------------------


$  2,000 Dade County Housing Finance Agency
           Single-Family, 4.00%, 10-1-97 (FGIC)$2,000

   2,000 Dade County Industrial Development
           Auth., (Dolphins Stadium Project
           Series C), VRDN, 3.60%, 12-4-96
           (LOC: Societe Generale)              2,000

   5,200 Dade County Industrial Development
           Auth., (Dolphins Stadium Project
           Series B), VRDN, 3.60%, 12-4-96
           (LOC: Societe Generale)              5,200

     705 Dade County Industrial Development
           Auth. Rev., (DNS Mfg, #237), VRDN,
           3.75%, 12-4-96 ( LOC: Barnett
           Bank of South Florida N.A.)            705

   4,495 Dade County Industrial Development
           Auth. Rev., (IVAX Labs), VRDN, 3.80%,
           12-4-96 (LOC: Bank of Tokyo -
           Mitsubishi, Ltd.)                    4,495

   1,000 Dade County Industrial Development
           Auth. Rev., (Stephen M. Greene),
           VRDN, 3.65%, 12-4-96 (LOC: Sun
           Bank Miami N.A.)                     1,000

   1,795 Dade County Metro GO, (Dade Fire and
           Rescue Service), 3.60%, 4-1-97
           (FGIC)                               1,797

   2,200 Dade County Resource Recovery Rev.,
           4.00%, 10-1-97 (AMBAC)               2,200

   4,050 Dade County Special Obligation Capital
           Asset Acquisition Rev., VRDN, 3.85%,
           12-4-96 (LOC: Sanwa Bank Ltd.)       4,050

   3,900 Escambia County Industrial Development
           Auth. Rev., (Gelman Sciences), VRDN,
           3.60%,12-4-96 (LOC: NBD Bank)        3,900

   4,500 Florida Housing Finance Agency
           Carribean Key, VRDN, 3.70%, 12-4-96
           (LOC: Key Bank)                      4,500

   4,200 Florida Housing Finance Agency
           Multi-Family Housing Rev., Series EEE,
           (Carlton Arms Project), VRDN, 3.55%,
           12-4-96 (LOC: Kredietbank N.V.)      4,200

   2,025 Florida Housing Finance Agency
           Multi-Family Housing Rev., 1989
           Series E, (Fairmont Oaks Project),
           VRDN, 3.70%, 12-4-96 (LOC:
           Comerica Bank)                       2,025

See Notes to Financial Statements

8    Florida Municipal Money Market               American Century Investments


                             SCHEDULE OF INVESTMENTS
                         FLORIDA MUNICIPAL MONEY MARKET

NOVEMBER 30, 1996 (UNAUDITED)

                                                  Value
   Principal Amount                          ($ in Thousands)
- --------------------------------------------------------------------------------

$  1,500 Florida Housing Finance Agency Rev.,
           (Oaks at Mill Creek Project), VRDN,
           3.60%, 12-4-96 (LOC: Chemical Bank) $1,500

   5,650 Florida Housing Finance Agency Rev.,
           (Ashley Lakes Project), VRDN, 3.60%,
           12-4-96 (LOC: Barclay's Bank)        5,650

   2,800 Florida Housing Finance Agency Rev.,
           (Beville-Oxford), VRDN, 3.80%,
           12-4-96 (SBBPA: Continental
           Casualty Co.)                        2,800

   2,000 Florida Housing Finance Agency Rev.,
           (Tiffany Club), VDRN, 3.75%, 12-4-96
           (LOC: NationsBank N.A.)              2,000

   2,500 Florida Housing Finance Agency Rev.,
           (Lee County Forestwood Apartments),
           VRDN, 3.60%, 12-4-96 (FNMA
           Collateral Agreement)                2,500

   4,800 Florida Housing Finance Agency Rev.,
           (Country Club Apartments), VRDN,
           4.15%, 12-2-96 (LOC: Northern
           Trust Corp.)                         4,800

   1,650 Florida Housing Finance Agency Rev.,
           (South Pointe Project), VRDN, 3.60%,
           12-4-96 (LOC: Chemical Bank)         1,650

   3,500 Florida Finance Housing Agency Rev.,
           (Sun Pointe Cove Apartments Project),
           VRDN, 3.60%, 12-4-96 (FNMA
           Collateral Agreement)                3,500

   5,000 Highlands County Health Facility
           Auth., VRDN, 3.55%, 12-5-96
           (SBBPA: Canadian Imperial Bank N.Y.) 5,000

   2,500 Hillsborough Aviation Auth. Rev.
           Commercial Paper, 3.60%, 1-14-97     2,500

   1,465 Hillsborough County Port District Rev.,
           (Tampa Port Auth.), 4.50%, 6-1-97
           (FSA)                                1,471

   3,500 Indian River County Hospital District
           Rev., 3.55%, 1-14-97 (LOC:
           Kredietbank N.V.)                    3,500

   1,000 Indian River County Industrial
           Development Rev., (Florida Convales),
           VRDN, 3.65%, 12-2-96 (LOC: Toronto
           Dominion Bank)                       1,000


                                                  Value
   Principal Amount                          ($ in Thousands)
- --------------------------------------------------------------------------------

$  2,000 Jacksonville Electric Commercial Paper,
           3.65%, 1-10-97 (Credit Suisse
           Liquidity)                          $2,000

   1,000 Jacksonville Electric Commercial Paper,
           3.55%, 1-14-97 (Credit Suisse
           Liquidity)                           1,000

   2,000 Jacksonville Electric Rev. Commercial
           Paper, 3.50%, 1-24-97 (SBBPA:
           Morgan Guaranty Trust)               2,000

   1,300 Jacksonville Hospital Rev., (Methodist
           Hospital Project), 10.50%, 10-1-97,
           Prerefunded at 102% of Par(1)        1,396

     940 Martin County Industrial Development
           Auth., (R.F. Labs, Inc.), VRDN, 3.65%,
           12-4-96 (LOC: Suntrust Bank Central
           Florida, N.A.)                         940

     300 Martin County Industrial Development
           Auth. Rev., (Tampa Farm Service, Inc.),
           VRDN, 3.65%, 12-4-96 (LOC:
           Suntrust Bank Central Florida, N.A.)   300

   1,700 Martin County Solid Waste Disposal
           Rev., (Florida Power and Light Comp.
           Project), VRDN, 4.25%, 12-2-96       1,700

   1,210 Monroe County School Board COP,
           3.70%, 8-1-97 (AMBAC)                1,210

     200 Ocean Highway and Port Auth. Rev.,
           VRDN, 3.60%, 12-4-96 (LOC: ABN
           Amro Bank, N.A.)                       200

   2,000 Ocean Highway and Port Auth. Rev.,
           Series 1990, VRDN, 3.60%, 12-4-96
           (LOC: ABN Amro Bank, N.A.)           2,000

   1,000 Orange County Health Facility Auth.
           Adventist Health System, VRDN,
           3.45%, 12-5-96 (LOC: Rabobank)       1,000

     915 Pinellas County Second GTD Entitlement
           Rev., 3.60%, 2-1-97 (FSA)              916

   5,000 Pinellas County Housing Finance
           Auth. Multi-Family Housing Rev.,
           VRDN, 3.60%, 12-4-96 (FNMA
           Collateral Agreement)                5,000

   2,000 Putnam County Development Auth.
           Rev., (PCR Seminole Electric), 3.80%,
           3-15-97 (Guaranteed: National
           Rural Utilities Cooperative
           Finance Corp.)                       2,000

See Notes to Financial Statements

Semiannual Report                            Florida Municipal Money Market    9


                             SCHEDULE OF INVESTMENTS
                         FLORIDA MUNICIPAL MONEY MARKET

NOVEMBER 30, 1996 (UNAUDITED)

                                                  Value
   Principal Amount                          ($ in Thousands)
- --------------------------------------------------------------------------------

$  2,525 Putnam County Development Auth.
           Rev., (Seminole Electric), VRDN,
           3.55%, 12-4-96 (Guaranteed:
           National Rural Utilities Cooperative
           Finance Corp.)                      $2,525

   3,000 Sarasota County Utility System Rev.,
           7.50%, 6-1-97, Prerefunded at 102%
           of Par(1)                            3,113

   1,100 Saint Lucie County Solid Waste Disposal
           Rev., (Florida Power & Light Comp.
           Proj.), VRDN, 4.25%, 12-2-96         1,100

   1,250 St. Johns County Housing Finance
           Auth. Rev., VRDN, 3.60%, 12-4-96,
           (LOC: Barnett Bank of Jacksonville)  1,250

   3,300 Sunshine State Government Finance
           Commercial Paper, 3.65%, 1-10-97
           (LOC: Union Bank of Switzerland,
           National Westminster Bank, Morgan
           Guaranty Trust)                      3,300

   2,000 Sunshine State Government Finance
           Commercial Paper, 3.50%, 1-14-97
           (LOC: Union Bank of Switzerland,
           National Westminster Bank, Morgan
           Guaranty Trust)                      2,000

   4,000 Tampa Occupational, VRDN, 3.35%,
           12-4-96 (FGIC) (SBBPA: General
           Electric Credit Corp.)               4,000

   1,500 Tampa Solid Waste Systems Rev.,
           4.00%, 10-1-97 (FGIC)                1,503

   2,000 University Athletic Association, Inc.
           Capital Improvement Rev., (University
           of Florida Stadium Project), VRDN,
           4.00%, 12-2-96 (LOC: Suntrust Bank
           Central Florida, N.A.)               2,000

   1,000 Volusia County Industrial Development
           Auth., (Daytona Plastix Inc.), VRDN,
           3.65%, 12-4-96 (LOC: Suntrust Bank
           Central Florida, N.A.)               1,000

   2,000 West Orange Memorial Commercial
           Paper Series A-1, 3.625%, 1-8-97
           (LOC: Rabobank)                      2,000


                             SCHEDULE OF INVESTMENTS
                         FLORIDA MUNICIPAL MONEY MARKET

NOVEMBER 30, 1996 (UNAUDITED)

                                                  Value
   Principal Amount                          ($ in Thousands)
- --------------------------------------------------------------------------------

$  2,000 West Orange Memorial Commercial
           Paper Series A-2, 3.625%, 1-8-97
           (LOC: Rabobank)                $    2,000
                                          ----------


TOTAL INVESTMENT SECURITIES--100.0%       $145,088(2)
                                          ==========   



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  
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 November 30, 1996.
(1)  Escrowed in U.S. Government Securities.
(2)  The  Florida  Municipal  Money  Market  Fund has 18.8%  invested in private
     activity  municipal  securities.  The  interest  from these  securities  is
     treated as a  tax-preference  item in calculating  the federal  alternative
     minimum tax.

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


 CURRENT YIELD (as of November 30, 1996)
<S>                                           <C>           <C>           <C>           <C>            <C>  
   Florida Intermediate-Term Municipal        4.04%         5.61%         5.86%         6.31%          6.69%


                                                                       6 MONTHS(2)     1 YEAR     LIFE OF FUND(3)


 AVERAGE ANNUAL RETURNS (as of November 30, 1996)(1)
   Florida Intermediate-Term Municipal ................................   4.59%         4.61%          6.66%
   Lehman 5-Year General Obligation Index(4) ..........................   4.74%         5.37%          6.57%
   Average Florida Intermediate Municipal Fund(5) .....................   4.45%         4.05%          6.35%
   Fund's Ranking Among Florida Intermediate Municipal Funds(6) .......    --        4 out of 20    5 out of 15

(1)  Returns are defined in the Glossary on page 25.
(2)  Not annualized.
(3)  Data shown is for period from 4/30/94 to 11/30/96. The fund's inception date was April 11, 1994.
(4)  See page 24 for more information about the fund's comparative index.
(5)  According to Lipper Analytical Services. See page 24 for more information about Lipper and the fund's category.
(6)  Rankings determined by Lipper based on average annual total returns for the periods indicated.
</TABLE>

[mountain graph - data below]

   GROWTH OF $10,000 OVER THE LIFE OF THE FUND
   $10,000
   investment
   made 4/30/94
                  Florida Intermediate-Term          Lehman 5-Year GO
   4/30/94       $10000                             $10000
   5/31/94        10093                              10056
   6/30/94        10054                              10033
   7/31/94        10195                              10142
   8/31/94        10252                              10191
   9/30/94        10173                              10114
   10/31/94       10045                              10058
   11/30/94       9876                               9993
   12/31/94       10032                              10081
   1/31/95        10212                              10178
   2/28/95        10471                              10326
   3/31/95        10539                              10490
   4/30/95        10592                              10518
   5/31/95        10830                              10749
   6/30/95        10811                              10757
   7/31/95        10930                              10908
   8/31/95        11021                              11018
   9/30/95        11069                              11051
   10/31/95       11195                              11097
   11/30/95       11297                              11192
   12/31/95       11386                              11253
   1/31/96        11513                              11387
   2/29/96        11481                              11349
   3/31/96        11328                              11288
   4/30/96        11310                              11271
   5/31/96        11300                              11258
   6/30/96        11351                              11338
   7/31/96        11477                              11413
   8/31/96        11476                              11436
   9/30/96        11552                              11522
   10/31/96       11663                              11629
   11/30/96       11818                              11791

   Value on 11/30/96
   Florida
   Intermediate-
   Term
   $11,818

   Lehman
   5-Year GO
   $11,791


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 Lehman index's total return line does not.


 PORTFOLIO AT A GLANCE
                              11/30/96        5/31/96
Number of Issues                 27             26
Weighted Average Maturity     7.64 years     7.89 years
Average Duration              4.97 years     5.47 years
Expense Ratio                   0.66%*         0.13%

*Annualized.

See the Glossary on page 25.

Semiannual Report                         Florida Intermediate-Term Municipal 11


                      FLORIDA INTERMEDIATE-TERM MUNICIPAL

Management Q & A

   An interview with Dave MacEwen, vice president and senior municipal portfolio
manager.

How did the fund perform?

   The fund performed  slightly above average  compared with its peers.  For the
six-month  period ended  November  30, 1996,  the Fund's total return was 4.59%,
compared with the 4.45% return of the 20 "Florida Intermediate  Municipal Funds"
tracked by Lipper Analytical Services. However, from a one-year perspective, the
fund's performance was even stronger, allowing it to place in the top 20% of its
peers.  Please keep in mind that a portion of the fund's  expenses were absorbed
by Benham Management  Corporation during the period and that the rankings listed
would have been lower if the fund's returns had been reduced by those expenses.+

How did you position the fund during the period?

   As the possibility of a short-term  interest rate hike by the Federal Reserve
increased,  we  began  moving  the  fund  into a  more  defensive  position.  To
accomplish  this, we allowed the fund's duration to shorten,  moving it from 5.5
years at the start of the period,  to around 5.0 years by the period's end. This
change brought the fund to a roughly neutral position  relative to its peers. In
addition to this neutral stance,  we maintained a bias toward a ladder portfolio
structure, spreading the fund's securities across the maturity spectrum.

Was this neutral  positioning the main reason for the fund's  middle-of-the-road
performance?

   Yes.  We tend to avoid  making  interest  rate bets  that can cause  unwanted
volatility in the fund's returns.  Rather than looking to add incremental return
through aggressive duration management as some of our competitors do, we look to
add  value  to the  fund by  searching  for  what  we  believe  are  undervalued
securities with the potential to appreciate.

Each December the fund  typically  sees a notable jump in cash inflows.  Can you
explain this?

   Yes. Florida's  intangibles tax is the driving force behind the sudden influx
of cash as investors look for  qualifying  Florida  state-issued  investments to
shelter some of their money before  December 31.  Because the tax is assessed on
assets as of December 31,  investors often wait until late December to invest in
sheltered securities.


[bar graph - data below]

   FLORIDA INTERMEDIATE-TERM MUNICIPAL
   FISCAL YEAR-BY-YEAR RETURNS (Years ended May 31)

                  Florida Intermediate-Term Municipal        Lehman 5-Year GO
   1994           0.93%                                       0.56%
   1995           7.31%                                       6.89%
   1996           4.33%                                       4.74%

   * From 4/29/94 to 5/31/94.

   This chart illustrates the historical  year-by-year  volatility of the fund's
   return.  The fund's total returns for the 1996 fiscal year include  operating
   expenses,  while  the  Lehman  index's  returns  do  not.  See  page 24 for a
   definition of the fund's comparative index.

   +Benham  Management  Corporation  absorbed all of the fund's expenses through
December 31, 1995.  Beginning January 1, 1996, the fund began absorbing expenses
at a rate of an  additional  .10% of  average  daily net  assets  each month and
continued until the fund reached its contractual  expense cap of .67% on July 1,
1996.

12   Florida Intermediate-Term Municipal          American Century Investments


                      FLORIDA INTERMEDIATE-TERM MUNICIPAL

What steps do you usually take to prepare for this event?

   One of our main  priorities  prior to  December  is to make the fund as fully
invested in munis as possible, temporarily decreasing our cash position. We also
lengthen  the fund's  duration  slightly at this time  because the cash  inflows
provide a shortening effect. Demand for Florida munis increases around this time
period,  often driving prices  higher.  By taking steps prior to December we are
able to avoid inflated muni prices, putting cash inflows to better use.

Is there  any  chance  that the fund  could be  affected  by the  budget  crisis
unfolding  in Miami?  The city has over $400  million in  outstanding  municipal
bonds.

   There is no need for concern.  Thanks to the thorough research carried out by
our Municipal Credit Research Team, none of the Benham municipal funds own bonds
issued by the city of Miami.

What are your plans for the fund going forward?

   Recent  economic  data has been mixed,  and concern over the  possibility  of
higher interest rates is again evident in the marketplace.  As a result, we will
likely maintain the fund's neutral stance, lengthening or shortening its average
maturity and duration in a narrow range around this position  when  appropriate.
If the  economic  outlook  does  change  significantly,  we believe  the fund is
positioned  to respond  quickly.  In addition,  we will  continue to utilize our
strong credit  research team to search for securities  with  undervalued  credit
ratings that we believe have the potential to appreciate in value.

[pie charts]

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

   PORTFOLIO  COMPOSITION BY SECURITY TYPE (as of 5/31/96)  
     Revenue Bonds 45% 
     GO 14% 
     Tax Allocation 12% 
     Prerefunded 6% 
     Other 23%

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

   PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/96)
     AAA 72%
     AA 28%

Investment terms are defined in the Glossary on page 25.

Semiannual Report                       Florida Intermediate-Term Municipal   13



                             SCHEDULE OF INVESTMENTS
                       FLORIDA INTERMEDIATE-TERM MUNICIPAL

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------


 MUNICIPAL SECURITIES
$    300 Boca Raton Water and Sewer
           Rev., 6.40%, 10-1-02                  $316

     150 Broward County Educational Auth.
           Rev., (Nova Southeastern University),
           5.40%, 4-1-02 (Connie Lee)             157

     300 Broward County School District GO,
           6.75%, 2-15-00                         321

     500 Dade County Seaport Rev., 5.15%,
           10-1-08 (MBIA)                         509

     500 Duval County School District GO,
           6.25%, 8-1-05 (AMBAC)                  548

     500 East County Waste Control District
           Rev., Series 1994, 5.375%,
           11-1-01 (Asset Guarantee)              520

     300 Escambia County Housing Finance
           Auth. Single Family Mortgage
           Rev., 6.00%, 4-1-02 (GNMA)             311

     305 Florida Department of General
           Services Rev., 7.75%, 9-1-98,
           Prerefunded at 102% of Par(1)          331

     350 Florida Housing Finance Agency
           Multi-Family Housing Rev., 5.35%,
           12-1-05, Put Date 6-1-00               353

     450 Florida Housing Finance Agency Rev.,
           (Williamsburg Village Apartments),
           5.60%, 12-1-07 (AMBAC)                 461

     500 Florida Housing Finance Agency Rev.,
           (Windwood), 5.65%, 12-1-07 (AXA
           Reinsurance)                           502

     250 Gainesville Utilities System Rev.,
           Series A, 5.75%, 10-1-09               268

     400 Hillsborough County Port District Special
           Rev., 6.50%, 6-1-04 (FSA)              446

     450 Hillsborough County Aviation Auth.
           Rev., (Tampa International Airport
           Series A), 6.60%, 10-1-03 (FGIC)       483

     400 Indian Trace Community Development
           Auth. Rev., (District Water Management),
           Series 1995 A, 5.25%, 5-1-03 (MBIA)    417


                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------


                                             Value
Principal Amount                       ($ in Thousands)


$    500 Jacksonville Electric Auth. Special
           Obligation, (St. John's River Power
           Project), 4th Series, 6.50%, 10-1-01  $544

     500 Jacksonville Excise Tax Rev., 5.20%,
           10-1-04 (FGIC)                         513

     300 Lakeland Water and Electric Rev.,
           6.00%, 10-1-07 (FGIC)                  331
     300 Lee County School Board COP,
           Series A, 5.40%, 8-1-04 (FSA)          314

     450 Orange County Health Facilities
           Auth. Rev., Series A, 6.00%,
           10-1-04 (MBIA)                         491

     450 Orlando and Orange County Expressway
           Auth. Rev., 6.50%, 7-1-11 (FGIC)       516

     500 Orlando Utility Commission Water and
           Electric Rev., 5.70%, 10-1-04          539

     200 Reedy Creek Improvement District
           Utility Rev., Series 1991, 6.25%,
           10-1-01, Prerefunded at 101% of
           Par (MBIA)(1)                          219

     400 St. Cloud Utility Rev. Refunding,
           6.40%, 8-1-06 (MBIA)                   436

     175 Tampa Palms Community Development
           Special Assessment Refunding,
           4.90%, 5-1-99 (MBIA)                   178

     500 Volusia County School District GO,
           6.20%, 8-1-03, (FGIC)                  545
                                               ------
TOTAL MUNICIPAL SECURITIES--94.6%              10,569
   (Cost $10,239)                              ------


SHORT-TERM MUNICIPAL SECURITIES--5.4%
     600 University Athletic Association, Inc.,
           Capital Improvement Rev., (University
           of Florida Stadium Project), VRDN,
           4.00%, 12-2-96, resets daily, final
           maturity 2-1-20 (LOC: Suntrust
           Bank Central Florida, N.A.)            600
                                                  ---
   (Cost $600)


TOTAL INVESTMENT SECURITIES--100.0%         $11,169(2)
   (Cost $10,839)                           =========

See Notes to Financial Statements

14   Florida Intermediate-Term Municipal          American Century Investments 


                             SCHEDULE OF INVESTMENTS
                       FLORIDA INTERMEDIATE-TERM MUNICIPAL

NOVEMBER 30, 1996 (UNAUDITED)

Notes to Schedule of Investments

AMBAC = AMBAC Indemnity Corp.
COP = Certificate of Participation
FGIC = Financial Guaranty Insurance Company
FSA = Financial Security Association
GNMA = Government National Mortgage Association
GO = General Obligation
MBIA = Municipal Bond Insurance Association
resets = The frequency  with which a  fixed-income  security's  coupon  changes,
     based  on  current  market  conditions  or an  underlying  index.  The more
     frequently a security resets, the less risk the investor is taking that the
     coupon will vary significantly from current market rates.
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 November 30, 1996.
(1)  Escrowed in U.S. Government Securities.
(2)  The Florida  Intermediate-Term  Municipal Fund has 6.8% invested in private
     activity  municipal  securities.  The  interest  from these  securities  is
     treated as a  tax-preference  item in calculating  the federal  alternative
     minimum tax.


See Notes to Financial Statements

Semiannual Report                       Florida Intermediate-Term Municipal   15

<TABLE>
<CAPTION>

                      STATEMENTS OF ASSETS AND LIABILITIES

                                                                                     FLORIDA            FLORIDA
                                                                                    MUNICIPAL      INTERMEDIATE-TERM
                                                                                   MONEY MARKET        MUNICIPAL

NOVEMBER 30, 1996 (UNAUDITED)
<S>                                                                                       <C>               <C>
 ASSETS                                                                                      $ In Thousands
Investment securities, at value (amortized cost and identified 
   cost of $10,839, respectively) .............................................     $   145,088         $11,169
Cash ..........................................................................           2,188             162
Interest receivable ...........................................................             605             142
Receivable from affiliates (Note 2) ...........................................               3               -
Prepaid expenses and other assets .............................................               4               3
                                                                                              -               -
                                                                                        147,888          11,476
                                                                                        -------          ------


 LIABILITIES
Disbursements in excess of demand deposit cash ................................              89              14
Payable for investments purchased .............................................           1,514             501
Payable for shares redeemed ...................................................           3,542               5
Dividends payable .............................................................              25               1
Payable to affiliates (Note 2) ................................................               -               6
Accrued expenses and other liabilities ........................................              16               -
                                                                                             --              --  
                                                                                          5,186             527
                                                                                          -----             ---
Net Assets Applicable to Outstanding Shares ...................................    $    142,702     $    10,949
                                                                                   ============     ===========


 CAPITAL SHARES, $1.00 AND $10.00 PAR VALUE, RESPECTIVELY
Outstanding (Unlimited number of shares authorized) (In thousands) ............         142,702           1,052
                                                                                        =======           =====
Net Asset Value Per Share .....................................................    $       1.00     $     10.41
                                                                                   ============     ===========


 NET ASSETS CONSIST OF:
Capital (par value and paid-in surplus) .......................................    $    142,702     $    10,549
Accumulated undistributed net realized gain (loss) on investment transactions .               -              70
Net unrealized appreciation on investments (Note 3) ...........................               -             330
                                                                                             --             ---
                                                                                   $    142,702     $    10,949
                                                                                   ============     ===========
</TABLE>

See Notes to Financial Statements

16   Statements of Assets and Liabilities         American Century Investments


<TABLE>
<CAPTION>

                            STATEMENTS OF OPERATIONS

                                                                                      FLORIDA             FLORIDA
                                                                                     MUNICIPAL      INTERMEDIATE-TERM
                                                                                    MONEY MARKET         MUNICIPAL
FOR THE SIX MONTHS ENDED NOVEMBER 30, 1996 (UNAUDITED)

 INVESTMENT INCOME                                                                            $ in Thousands
Income:
<S>                                                                                <C>              <C>        
Interest ......................................................................    $      2,174     $       272
                                                                                   ------------     -----------

Expenses (Note 2):
Investment advisory fees ......................................................             263              23
Administrative fees ...........................................................              59               5
Transfer agency fees ..........................................................              20               5
Printing and postage ..........................................................              13               5
Custodian fees ................................................................              12               3
Auditing and legal fees .......................................................              15               3
Registration and filing fees ..................................................              16               -
Directors' fees and expenses ..................................................               4               1
Other operating expenses ......................................................               9               5
                                                                                   ------------     -----------
  Total expenses ..............................................................             411              50
Amount waived (Note 2) ........................................................           (408)            (15)
Custodian earnings credits (Note 4) ...........................................             (3)               -
                                                                                   ------------     -----------
  Net expenses ................................................................               -              35
                                                                                   ------------     -----------
Net investment income .........................................................           2,174             237
                                                                                   ------------     -----------


 REALIZED AND UNREALIZED GAIN

 ON INVESTMENTS (NOTE 3)
Net realized gain on investments ..............................................               -              31
Change in net unrealized appreciation on investments ..........................               -             200
                                                                                   ------------     -----------
Net realized and unrealized
gain on investments ...........................................................               -             231
                                                                                   ------------     -----------
Net Increase in Net Assets
Resulting from Operations .....................................................    $      2,174     $       468
                                                                                   ============     ===========
</TABLE>

See Notes to Financial Statements

Semiannual Report                                 Statements of Operations    17
<TABLE>
<CAPTION>

                       STATEMENTS OF CHANGES IN NET ASSETS

                                                                                   FLORIDA                         FLORIDA
                                                                                  MUNICIPAL                   INTERMEDIATE-TERM
                                                                                MONEY MARKET                      MUNICIPAL
SIX MONTHS ENDED NOVEMBER 30, 1996 (UNAUDITED)
AND YEAR ENDED MAY 31, 1996
    
                                                                          November 30,       May 31,      November 30,      May 31,
Increase in Net Assets                                                       1996            1996            1996           1996
                                                                                $ in Thousands               $ in Thousands

 OPERATIONS
<S>                                                                       <C>             <C>             <C>             <C>      
Net investment income ..............................................      $   2,174       $   2,956       $     237       $     533
Net realized gain on investment transactions .......................           --              --                31              60
Change in net unrealized appreciation
  (depreciation) on investments ....................................           --              --               200            (155)
                                                                              -----           -----             ---             ---
Net increase in net assets resulting from operations ...............          2,174           2,956             468             438
                                                                              -----           -----             ---             ---


 DISTRIBUTION TO SHAREHOLDERS
From net investment income .........................................         (2,174)         (2,956)           (237)           (533)
From net realized gains from investment transactions ...............           --              --              --               (44)
                                                                              -----           -----             ---             ---
Decrease in net assets from distributions ..........................         (2,174)         (2,956)           (237)           (577)
                                                                             ------          ------            ----            ---- 


 CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ..........................................         91,257         196,163           1,734           7,317
Proceeds from reinvestment of distributions ........................          1,231           2,887             175             403
Payments for shares redeemed .......................................        (49,779)       (144,204)         (1,510)         (6,794)
                                                                            -------        --------          ------          ------ 
Net increase in net assets from capital share transactions .........         42,709          54,846             399             926 
                                                                             ------          ------             ---             --- 

Net increase in net assets .........................................         42,709          54,846             630             787


NET ASSETS
Beginning of period ................................................         99,993          45,147          10,319           9,532
                                                                             ------          ------          ------           -----

End of period ......................................................      $ 142,702       $  99,993       $  10,949       $  10,319
                                                                          =========       =========       =========       =========


 TRANSACTIONS IN SHARES OF THE FUNDS (IN THOUSANDS)
Sold ...............................................................         91,257         196,163             169             703
Issued in reinvestment of distributions ............................          1,231           2,887              17              39
Redeemed ...........................................................        (49,779)       (144,204)           (147)           (654)
                                                                            -------        --------            ----            ---- 
Net increase .......................................................         42,709          54,846              39              88
                                                                             ======          ======              ==              ==
</TABLE>

See Notes to Financial Statements

18   Statements of Changes in Net Assets          American Century Investments


                          NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)


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 eight Funds composing
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.  Premium and original  issue
discount is amortized  daily using the  effective  interest  rate method for the
Intermediate-Term Fund. Market discount is recognized as income upon the sale or
maturity of the security for the  Intermediate-Term  Fund.  Premium and discount
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.

   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  directors 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  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  option  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 change 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 unrealized  gains and losses.  The Fund
recognizes a realized gain or loss when the contract is closed or expires.

Semiannual Report                            Notes to Financial Statements    19


                          NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)

   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.

          .50% of the first $100 million  
          .45% of the next $100 million 
          .40% of the next $100 million  
          .35% of the next $100 million 
          .30% of the next $100 million  
          .25% of the next $1 billion  
          .24% of the next $1 billion
          .23% of the next $1 billion   
          .22% of the next $1 billion  
          .21% of the next $1 billion 
          .20% of the next $1 billion
          .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  agreement  was  formerly  with Benham
Financial Services, Inc.

   The  Trust  has an  additional  agreement  with BMC  pursuant  to  which  BMC
established a contractual expense guarantee that limits Fund expenses (excluding
expenses such as brokerage  commissions,  taxes,  interest,  custodian  earnings
credits, and extraordinary expenses) to .61% of average daily closing net assets
for the Money Market Fund and .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.  The expense  guarantee rate is
subject to renewal in June 1997. BMC  voluntarily  agreed to absorb all expenses
for the  Intermediate-Term  Fund through  December 31, 1995, and all expenses of
the Money Market Fund through December 31, 1997.  Beginning January 1, 1996, the
Intermediate-Term Fund added expenses at a rate of .10% of average daily closing
net assets per month until the Fund  reached  the  contractual  expense  rate of
 .67%. Starting in January 1997, the Money Market Fund will begin adding expenses
at a rate of .10% per month until its expense rate of .61% is reached.

   The payable  (receivable) to affiliates as of November 30, 1996, based on the
above agreements, was as follows:

                                              Florida
                                Florida    Intermediate-
                               Municipal       Term-
                             Money Market    Municipal
Investment Advisor ........ $  (23,102)    $   3,644
Administrative Services ...     14,168         1,658
Transfer Agent ............      5,465           596
                              ---------     --------
                            $   (3,469)    $   5,898
                              =========     ========


   The Trust has a distribution  agreement  with ACIS which is  responsible  for
promoting  sales of and  distributing  the Trust's  shares.  This  agreement was
formerly with Benham Distributors, Inc.

20   Notes to Financial Statements                American Century Investments


                          NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)

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

   The aggregate cost of municipal debt obligations  purchased and proceeds from
sales (excluding  short-term  investments) for the six months ended November 30,
1996,  for  the  Intermediate-Term   Fund  totaled  $3,174,982  and  $2,786,152,
respectively.

   As of November 30,  1996,  accumulated  net  unrealized  appreciation  of the
Intermediate-Term  Fund was $329,997,  consisting of unrealized  appreciation of
$331,840,  and  unrealized   depreciation  of  $1,843.  The  aggregate  cost  of
investments  for  federal  income  tax  purposes  was the  same as the  cost for
financial reporting purposes.

- --------------------------------------------------------------------------------
4. Expense Offset Arrangements

   Each Fund's  Statement of Operations  reflects  custodian  earnings  credits.
These  amounts are used to offset the custody  fees  payable by the Funds to the
custodian  bank.  The credits  are earned  when the Fund  maintains a balance of
uninvested  cash at the custodian  bank.  Beginning  with the year ended May 31,
1996,  the  ratios of  operating  expenses  to average  net assets  shown in the
Financial Highlights are calculated as if these credits had not been earned.

- --------------------------------------------------------------------------------
5. Subsequent Events

   The following name changes became effective January 1, 1997:

<TABLE>

                        NEW NAMES                                     FORMER NAMES
<S>                      <C>                                         <C>   
   Fund's Issuer:       American Century Municipal Trust              Benham Municipal Trust
   Funds:               American Century - Benham Florida             Benham Florida Municipal Money Market Fund
                        Municipal Money Market Fund
                        American Century - Benham Florida             Benham Florida Municipal Intermediate-Term Fund
                        Intermediate-Term Municipal Fund
   Parent Company:      American Century Companies, Inc.              Twentieth Century Companies, Inc.
   Distributor:         American Century Investment Services, Inc.    Twentieth Century Securities, Inc.
   Transfer Agent:      American Century Services Corporation         Twentieth Century Services, Inc.
</TABLE>

Semiannual Report                            Notes to Financial Statements    21
<TABLE>
<CAPTION>


                              FINANCIAL HIGHLIGHTS
                         FLORIDA MUNICIPAL MONEY MARKET


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

                                                                1996(1)       1996         1995         1994(2)


 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 .....................................      .02         .04          .04         --
                                                                   ---         ---          ---         -----  
Distributions
  From Net Investment Income ................................     (.02)       (.04)        (.04)        --
                                                                  ----        ----         ----         -----  
Net Asset Value, End of Period ..............................    $1.00       $1.00        $1.00         $1.00
                                                                 =====       =====        =====         =====
  Total Return(3) ...........................................     1.79%       3.86%        3.71%       .40%


 RATIOS/SUPPLEMENTAL DATA
  Ratio of Operating Expenses to Average Net Assets(4) ......        --        .01%           --            --
  Ratio of Operating Expenses to Average Net Assets
     (Before Reimbursement)(4) ..............................   .68%(5)        .71%         .88%      1.58%(5)
  Ratio of Net Investment Income to Average Net Assets(4) ...  3.57%(5)       3.75%        3.93%      2.99%(5)
  Ratio of Net Investment Income to Average Net Assets
     (Before Reimbursement)(4) ..............................  2.89%(5)       3.05%        3.05%      1.41%(5)
  Net Assets, End of Period (in thousands) ..................  $142,702     $99,993      $45,147        $5,565

(1)  Six months ended November 30, 1996.
(2)  From April 11, 1994 (commencement of operations) through May 31, 1994.
(3)  Total return assumes reinvestment of dividends.  Total returns for periods less than one year are not annualized.
(4)  The ratios for the periods subsequent to May 31, 1995, include expenses paid through expense offset arrangements.
(5)  Annualized
</TABLE>
See Notes to Financial Statements

22   Financial Highlights                         American Century Investments
<TABLE>
<CAPTION>

                              FINANCIAL HIGHLIGHTS
                       FLORIDA INTERMEDIATE-TERM MUNICIPAL

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

                                                                1996(1)       1996         1995         1994(2)


 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 .....................................     .23           .52          .52          .07
  Net Realized and Unrealized Gain (Loss) on Investments ....     .23          (.08)         .19          .11
                                                                  ---          ----          ---          ---
  Total From Investment Operations ..........................     .46           .44          .71          .18
                                                                  ---           ---          ---          ---
Distributions
  From Net Investment Income ................................    (.23)         (.52)        (.52)        (.07)
  From Net Realized Gains on Investment Transactions ........     --           (.04)         --           --
                                                                 ----          ----         ----         ----       
  Total Distributions .......................................    (.23)         (.56)        (.52)        (.07)
                                                                 ----          ----         ----         ---- 
Net Asset Value, End of Period ..............................  $10.41        $10.18       $10.30       $10.11
                                                               ======        ======       ======       ======
  Total Return(3) ...........................................    4.59%         4.34%        7.31%        1.79%


 RATIOS/SUPPLEMENTAL DATA
  Ratio of Operating Expenses to Average Net Assets(4) ......  .66%(5)         .13%            --           --
  Ratio of Operating Expenses to Average Net Assets
     (Before Reimbursement)(4) ..............................  .95%(5)         .88%         1.09%     1.92%(5)
  Ratio of Net Investment Income to Average Net Assets(4) ... 4.51%(5)        5.05%         5.23%     5.02%(5)
  Ratio of Net Investment Income to Average Net Assets
     (Before Reimbursement)(4) .............................. 4.22%(5)        4.30%         4.14%     3.10%(5)
  Portfolio Turnover Rate ...................................   27.14%       66.39%        36.63%        5.71%
  Net Assets, End of Period (in thousands) .................. $10,949      $10,319        $9,532       $5,892

(1)  Six months ended November 30, 1996.
(2)  From April 11, 1994 (commencement of operations) through May 31, 1994.
(3)  Total  return   assumes   reinvestment   of  dividends   and  capital  gain
     distributions, if any. Total returns for periods less than one year are not
     annualized.
(4)  The ratios for the periods subsequent to May 31, 1995, include expenses paid through expense offset arrangements.
(5)  Annualized.
</TABLE>

Semiannual Report                                 Financial Highlights        23


                             BACKGROUND INFORMATION


Investment Objectives & Policies

American Century  Investments offers 41 fixed-income  funds,  ranging from money
market funds to long-term  bond funds and including  both taxable and tax-exempt
funds.

Florida Municipal Funds

   The  Florida  Funds seek to obtain as high a level of current  income  exempt
from  regular  federal  income  tax as is  consistent  with  prudent  investment
management and conservation of shareholders'  capital. In addition,  fund shares
are intended to be exempt from the Florida  intangibles  tax.  Each Florida fund
will invest at least 65% of its net assets in Florida municipal obligations. The
remaining 35% of net assets may be invested in (1)  obligations  issued by other
states and their political subdivisions and (2) U.S. government securities.

   Florida Municipal Money Market Fund, which was established on April 11, 1994,
may be appropriate  for investors  seeking share price  stability who can accept
the lower yields that short-term obligations typically provide.

      The fund invests in  high-quality  municipal  obligations  with  remaining
maturities of 13 months or less and maintains a dollar-weighted average maturity
of 90 days or less.

   Florida Intermediate-Term  Municipal Fund, which was established on April 11,
1994, invests primarily in intermediate-term  Florida municipal obligations with
maturities  of four or more years and  maintains  a weighted  average  portfolio
maturity of five to ten 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 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 States Tax-Exempt Money Market Funds category invest in
high-quality  municipal  obligations with dollar-weighted  average maturities of
less than 90 days.

   The funds in Lipper's  Florida  Intermediate  Municipal  Debt Funds  category
invest at least 65% of assets in  municipal  debt  issues  which are exempt from
taxation in Florida, with dollar-weighted average maturities of 5 to 10 years.


 PORTFOLIO MANAGEMENT TEAM
  Vice President & Senior
  Municipal Portfolio Manager           Dave MacEwen
  Municipal Portfolio Manager           Bryan Karcher
  Municipal Credit Research Manager     Steven Permut
  Credit Analysts                       Scott Lord, Bill McClintock

24   Background Information                       American Century Investments


                                    GLOSSARY


Returns

   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.

   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.

Bond Portfolio Structures

   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.)

   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.)

   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

   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%).

   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.
Most "normal"  yield curves start in the lower left corner of the graph and rise
to the upper right corner,  indicating that yields rise as maturities  lengthen.
This   upward   sloping   yield   curve   illustrates   a   normal   risk/return
relationship--more return (yield) for more risk (a longer maturity). Conversely,
a "flat" yield curve provides little or no extra return for taking on more risk.

Statistical Terminology

   Average Duration--measures the interest rate sensitivity of a bond portfolio.
Specifically,  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.  Therefore,  longer portfolio durations typically mean greater
sensitivity to changes in interest rates.

   Market  Value--the  market  value of a fund's  investments  on a given  date.
Number of Issues--the number of different securities issuances held by a fund on
a given date.

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

Types of Municipal Securities

   General Obligation (GO)  Bonds--securities  backed by the taxing power of the
issuer.

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

   Prerefunded  Bonds--securities  refinanced  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.

   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).

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

Semiannual Report                                           Glossary          25


[american century logo]
American 
Century(sm)

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

Person-to-Person Assistance:
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 816-753-1865

Fax: 816-340-7962

Internet: www.americancentury.com



American Century Municipal Trust

Investment Manager
Benham Management Corporation
Mountain View, California

   This report and the financial  statements  contained herein 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.


9701           [recycled logo]
SH-BKT-6151       Recycled




                                  [Book Three]




                                SEMIANNUAL REPORT
                                NOVEMBER 30, 1996

                            [american century logo]
                                    American
                                  Century(sm)


                                     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 Overview ..........................4
Tax-Free Money Market
     Performance Information .......................5
     Management Q & A ..............................6
     Schedule of Investments .......................8
     Financial Highlights .........................31
Intermediate-Term Tax-Free
     Performance Information ......................11
     Management Q & A .............................12
     Schedule of Investments ......................15
     Financial Highlights .........................32
Long-Term Tax-Free
     Performance Information ......................18
     Management Q & A .............................19
     Schedule of Investments ......................22
     Financial Highlights .........................33
Statements of Assets and Liabilities ..............25
Statements of Operations ..........................26
Statements of Changes in Net Assets ...............27
Notes to Financial Statements .....................28
Background Information
     Investment Philosophy & Policies .............36
     Comparative Indices ..........................36
     Lipper Rankings ..............................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,  American  Century  funds have
been divided 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            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  expanded at a modest,  non-inflationary  pace during the
     twelve  months  ended  November  30, 1996.  As a result,  the U.S.  Federal
     Reserve has held short-term interest rates steady since February 1996.

o    Municipal  securities  (munis)  performed  favorably  during the six months
     ended  November 30, 1996.  Low issuance  supported  munis by damping market
     volatility and keeping bond prices relatively stable.

Credit Review

o    Improving economic  conditions helped many  municipalities to credit rating
     upgrades,  which outpaced  downgrades by better than a 3-to-1 margin during
     1996.

o    Regionally,  the West, Southwest and Rocky Mountain states are experiencing
     the strongest economic growth;  the Midwest is steady;  while the Northeast
     and Great Lakes regions are lagging.

o    General  obligation  bonds are benefiting from this strong economic growth;
     however,  welfare reform may pose a long-term credit concern for states and
     their municipalities.

Tax-Free Money Market

o    The fund  slightly  outperformed  its Lipper peer group average for the six
     months ended November 30, 1996.

o    Beginning January 1, 1997, the fund will be able to invest up to 20% of its
     assets in securities  subject to the federal  alternative  minimum tax. The
     change should allow greater flexibility in the management of the fund.

o    Going  forward,  depending on the interest rate outlook,  we may extend the
     fund's average  maturity after late January,  when muni money market yields
     typically rise.

Intermediate-Term Tax-Free

o    The fund  performed in line with its Lipper peer group  average for the six
     months ended November 30, 1996.

o    Beginning  January 1, 1997, the fund will be able to invest in bonds across
     the entire investment-grade  spectrum. The fund will also be able to invest
     up to 20% of its assets in  securities  subject to the federal  alternative
     minimum tax.

o    Going  forward,  we  will  likely  maintain  the  fund's  neutral  posture,
     adjusting the fund's average maturity as conditions warrant.

Long-Term Tax-Free

o    The fund  outperformed  its  Lipper  peer  group for the six  months  ended
     November 30, 1996.

o    Beginning  January 1, 1997, the fund will be able to invest in bonds across
     the entire investment-grade  spectrum. The fund will also be able to invest
     up to 20% of its assets in  securities  subject to the federal  alternative
     minimum tax.

o    Going  forward,  we  will  likely  maintain  the  fund's  neutral  posture,
     adjusting the fund's average maturity as conditions warrant.


                                    Tax-Free
                                  Money Market

                          Total Returns:AS OF 11/30/96
                                 6 Months 1.45%*
                                  1 Year 3.00%

                           Net Assets: $91.1 million
                                (AS OF 11/30/96)

                            Inception Date: 7/31/84

                              Ticker Symbol: BNTXX



                                Intermediate-Term
                                    Tax-Free

                          Total Returns:AS OF 11/30/96
                                 6 Months 4.86%*
                                  1 Year 4.93%

                           Net Assets: $64.6 million
                                (AS OF 11/30/96)

                            Inception Date: 7/31/84

                              Ticker Symbol: BNTIX



                                    Long-Term
                                    Tax-Free

                          Total Returns:AS OF 11/30/96
                                 6 Months 6.54%*
                                  1 Year 4.62%

                           Net Assets: $56.9 million
                                (AS OF 11/30/96)

                            Inception Date: 7/31/84

                              Ticker Symbol: BTFLX

                               * Not annualized.

Semiannual Report                                      Report Highlights       1


                               OUR MESSAGE TO YOU

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

   The six months ended November 30, 1996, were eventful,  both in the U.S. bond
market and at our company. After a rocky period in the first half of 1996, bonds
stabilized  during the summer and enjoyed a rebound in October and November.  In
the following  pages,  our investment  management team provides  further details
about the market and how your fund was managed during the period.

   Changing market conditions  underscore the importance of quality investments.
Our  commitment to quality  securities is  exemplified  by our municipal  credit
research team. The three members of the team carry out in-depth  analysis on all
securities  considered for purchase by American  Century  municipal money market
and bond funds.  The team recently  established a new credit  management  system
that defines investment limits to cap our funds' exposure to individual issuers,
sectors or regions.

   On the corporate front, we completed the operational integration of Twentieth
Century  and The Benham  Group in  September.  As a result,  you now have direct
access to a broader spectrum of funds and services.

   We also changed the name of our company. On January 1, 1997, we began serving
you as American Century  Investments,  which reflects our expanded  identity and
the  independent  thinking  common to  Twentieth  Century and  Benham.  American
Century's  fund  family is divided  into three  groups--the  Benham  Group,  the
American  Century  Group and the Twentieth  Century  Group.  The Tax-Free  funds
(formerly known as the National Tax-Free funds) will remain in the Benham Group,
reflecting  their continued  adherence to the fixed-income  investment  approach
that we have employed for years.

   This report is the first in a new format  designed using your input.  We hope
you find it more informative and easier to read. Another informative resource is
the American Century Web site. If you use a personal  computer and have Internet
access,  we've made it easier for you to  download  information  about  American
Century funds and access your fund  accounts.  With a personal  access code, you
can view account  balances,  exchange money between  existing  accounts and make
additional investments. The Web site address is: www.americancentury.com. We are
one of the first fund  companies to offer direct  on-line  transactions  via the
Internet.

   These are  examples  of how we continue  to work to provide  information  and
services that are useful and convenient to investors in our funds. Thank you for
investing with us.

Sincerely,

/s/James E. Stowers III
James E. Stowers III
President and Chief Executive Officer
American Century Companies

/s/James M. Benham
James M. Benham
Vice Chairman
American Century Companies

2    Our Message To You                           American Century Investments


                                 PERIOD OVERVIEW


U.S. Economy

   During the six months ended November 30, 1996, the U.S. economy  continued to
rebound from slow growth during 1995 and early 1996. An improving retail sector,
surging auto sales and a resilient  housing  market helped the economy expand at
an  impressive  4.7%  annual  rate in the second  quarter of 1996.  The  economy
remained  strong  throughout  the summer as healthy  employment  growth sent the
national  unemployment rate to a six-year low of 5.1% by August.  However,  this
trend  appeared to reverse  itself late in the period--  third-quarter  economic
growth slowed to a more sedate 2.1% annual pace.

   In spite of the second-quarter surge in growth, inflation remained tame. From
the start of 1996 through November, inflation (as measured by the consumer price
index)  grew at an annual  rate of 3.3%.  In light of this lack of  inflationary
pressure, the Fed held short-term interest rates steady throughout the six-month
period.

U.S. Municipal Bond Market

   Overall,  the six-month  period ended  November 30, 1996, was a favorable one
for municipal bonds (munis). The accompanying muni yield curve graph depicts how
the muni yield curve shifted lower throughout the period.  Although munis traded
listlessly throughout the summer,  reflecting the market's uncertainty about the
strength of the U.S. economy, munis outperformed Treasury securities (Treasurys)
between mid-June and late August. By late September, the outlook for munis began
to  change.  Continued  signs of low  inflation,  stable  monetary  policy,  and
expectations of a status quo election year ignited a substantial  rebound in the
market, which continued through October and November.  As is often the case when
interest rates are falling rapidly, munis underperformed Treasurys.

   Muni yields declined  significantly  during the six-month  period.  Yields on
shorter-term  munis fell more than 30 basis points,  while yields on longer-term
munis dropped by about 50 basis points.

   Historically  low issuance of new munis,  especially  among  shorter-maturity
securities,  continued to support muni prices.  While 1996 muni issuance through
November was slightly higher than 1995 levels,  the limited supply helped dampen
market  volatility  and  keep  prices  relatively  stable.  Although  some  muni
refunding  activity  occurred when interest  rates fell late in the period,  the
refundings had little impact on bond prices.

   Looking forward, more recent data has provided enough conflicting evidence to
cause considerable  uncertainty about the rate of U.S. economic growth.  Despite
this concern,  there are many positive  factors working in munis' favor.  One is
muni issuance,  which should remain at historically low levels in the near term.
Barring a significant  decrease in interest rates,  muni refundings  should also
remain tame.  In addition,  the reduced  likelihood  of major tax reform and the
possibility for further reductions to the budget deficit improve the outlook for
munis.

[line graph - data below]

   Municipal Yield Curve

   Years          11/29/96          8/26/96          6/14/96
   1              3.46%             3.8%             3.76%
   2              3.76              4.05             4.25
   3              3.96              4.25             4.47
   4              4.08              4.4              4.62
   5              4.18              4.5              4.74
   6              4.28              4.6              4.84
   7              4.38              4.7              4.94
   8              4.48              4.8              5.04
   9              4.58              4.9              5.14
   10             4.68              5                5.24
   11             4.768             5.082            5.33
   12             4.856             5.164            5.42
   13             4.944             5.246            5.51
   14             5.032             5.328            5.6
   15             5.12              5.41             5.69
   16             5.148             5.444            5.724
   17             5.176             5.478            5.758
   18             5.204             5.512            5.792
   19             5.232             5.546            5.826
   20             5.26              5.58             5.86
   21             5.268             5.588            5.868
   22             5.276             5.596            5.876
   23             5.284             5.604            5.884
   24             5.292             5.612            5.892
   25             5.3               5.62             5.9
   26             5.304             5.624            5.904
   27             5.308             5.628            5.908
   28             5.312             5.632            5.912
   29             5.316             5.636            5.916
   30             5.32              5.64             5.92

Semiannual Report                                           Period Overview    3


                            MUNICIPAL CREDIT OVERVIEW

   U.S. economic growth rebounded in 1996. Retail sales improved steadily,  home
sales  remained  robust  and  surging   employment   growth  kept  the  national
unemployment rate at a relatively low 5.3% in December. These favorable economic
trends led to further improvements in municipal credit quality.  Credit upgrades
outpaced  downgrades by more than 3 to 1 during 1996.  This contrasts with 1995,
when downgrades outnumbered upgrades.

   Regionally,  the Rocky Mountain states and the Southwest continued to display
the strongest  economic growth in the nation, and this strength has now extended
to the West Coast (see the  accompanying  map).  California has fully  recovered
from the  economic  downturn  it suffered  in the early  1990s,  and the state's
economy  is now  growing  at a rate  faster  than the  nation  as a  whole.  The
southeastern  part of the  country  also  remains  strong,  while the Midwest is
growing at a relatively steady pace. The only lagging regions are the Northeast,
the Great Lakes areas and  Louisiana,  but even these regions have seen improved
economic conditions in 1996.

   The stronger economic  environment has been favorable for general  obligation
(GO) bonds and other forms of  tax-supported  debt,  which have  benefited  from
increased tax revenues.  However,  pending federal policy  decisions  related to
health  and  welfare  may  pose   longer-term   concerns  for  state  and  local
governments.  Among other specific sectors, health care issues have continued to
suffer  credit  pressures  due  to  a  widespread  trend  toward  managed  care.
Competition  and  deregulation  have also begun to impact the credit  quality of
many public power issues.

   It's  important to note that this  analysis  provides only a glimpse of broad
trends within the municipal  market.  While sector analysis remains an important
element in municipal  research,  growing market complexity and issue disparities
point to a continuing need for thorough case-by-case credit analysis.

[picture of U. S. map]

 CREDIT QUALITY TRENDS
   (U.S. map)

   Improving:
   Arizona
   California
   Colorado
   Georgia
   Idaho
   Mississippi
   Nevada
   North Carolina
   Oregon
   South Carolina
   Texas
   Tennessee
   Utah
   Virginia
   Washington
   Wisconsin

   Stable:
   (all other states)

4    Municipal Credit Overview                    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 YIELD (as of November 30, 1996)
<S>                             <C>           <C>           <C>           <C>           <C>            <C>  
   Tax-Free Money Market        2.96%         3.01%         4.11%         4.29%         4.63%          4.90%


                                           6 MONTHS(2)     1 YEAR        3 YEARS       5 YEARS       10 YEARS


 AVERAGE ANNUAL RETURNS (as of November 30, 1996)(1)
   Tax-Free Money Market .................... 1.45%          3.00%         2.85%         2.62%          3.80%

   Average Tax-Exempt Money Market Fund(3) .. 1.43%          2.96%         2.83%         2.63%          3.76%

   Fund's Ranking Among Tax-Exempt
   Money Market Funds(4) ....................  --      60 out of 132  53 out of 111  45 out of 91   20 out of 57



(1)  Returns are defined in the Glossary on page 37.
(2)  Not annualized.
(3)  According to Lipper Analytical Services. See page 36 for more information about Lipper and the fund's category.
(4)  Rankings determined by Lipper based on average annual returns for the periods indicated.
</TABLE>


 PORTFOLIO AT A GLANCE
                           11/30/96    5/31/96
Number of Issues              48         58
Weighted Average Maturity   43 days    42 days
Expense Ratio               0.68%*      0.65%

* Annualized.

See the Glossary on page 37.

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.

Semiannual Report                                 Tax-Free Money Market        5


                             TAX-FREE MONEY MARKET

Management Q & A

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

How did the fund perform?

   The fund performed  slightly above average  compared to its peers,  returning
1.45% for the six months ended November 30, 1996,  compared to the 1.43% average
return for the 134 "Tax-Exempt  Money Market Funds" tracked by Lipper Analytical
Services.  For the fiscal year ended  November 30, 1996, the Fund returned 3.00%
compared to the 2.96% average return of its Lipper peers.

How was the fund positioned during the six-month period?

   Due to recurring  uncertainty about the outlook for short-term interest rates
over the period, the fund was positioned fairly  conservatively in comparison to
its peers. We kept its average  maturity steady at around 42 days (about 11 days
short  of its  peer-group  average).  During  the  period,  yields  on  one-year
municipal  securities  fluctuated  within a range of about 3.55% to 3.95% as the
interest rate outlook shifted in response to changing  economic data. We watched
for  opportunities  to add yield to the fund by buying  one-year  paper whenever
rates moved toward the higher end of this range.

Typically,  sometime between May and November, the fund's holdings of commercial
paper drop significantly,  while holdings of variable-rate  demand notes (VRDNs)
increase. Why?

   In June and July,  many municipal  money market issues  mature,  resulting in
large amounts of cash that need to be reinvested.  The resulting surge in demand
drives muni prices up and yields down. To prepare for this period,  we typically
buy  significant  amounts of commercial  paper in May to lock in more attractive
yields  and help to tide the fund over this  "technical  period."  As year's end
approaches,  we allow the fund's  weighting of commercial  paper to decrease and
invest more of its assets in highly liquid daily and weekly VRDNs,  whose yields
typically move higher at that time.

[pie charts]

   PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 11/30/96)

   VRDNs 73% 
   Municipal Notes 10% 
   Commercial Paper 9% 
   Bonds less than 1 Year 8%

   PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 5/31/96)

   VRDNs 56% 
   Commercial Paper 20% 
   Bonds less than 1 Year 12% 
   Municipal Notes 9% 
   Other 3%

Investment terms are defined in the Glossary on page 37.

6    Tax-Free Money Market                        American Century Investments


                             TAX-FREE MONEY MARKET

As of January  1, 1997,  the fund will be able to invest up to 20% of its assets
in securities that are subject to the federal  government's  alternative minimum
tax (AMT). What was the motive behind the change?

   The  ability  to buy AMT paper  will  provide  much  greater  flexibility  in
managing the fund, giving us a significantly  wider range of securities in which
to  invest.   Another  advantage  is  that  AMT  paper  offers  slightly  higher
yields--typically  around 10 basis points more than non-AMT  paper.  This should
help improve the fund's yield slightly--though not significantly, because of the
20% limit.

Looking  at  things  from a  geographic  standpoint,  are there any areas of the
country or any specific states whose bonds you find particularly attractive?

   We do tend to buy more from some  states  than from  others.  One  example is
Texas,  whose  bonds tend to be more liquid than many other munis due to a large
amount of issuance by the state.  There are also certain  states that we tend to
underweight in the portfolio,  such as the so-called  "specialty"  states of New
York,  New Jersey and  California.  High state income tax levels in these states
make munis more  attractive to  investors,  resulting in lower yields than those
offered by other states' munis.

What are your plans for the fund going forward?

   We plan to keep an eye out for AMT  securities  that we can add to the fund's
portfolio to boost its yield.  Depending on the interest  rate  outlook,  we may
begin looking to extend the fund's  average  maturity  somewhat after the end of
January,  when muni yields have rebounded  from the "January  effect." This is a
seasonal drop in muni money market yields which typically occurs in January when
demand for these securities surges. One catalyst for surging demand is the large
amount of coupon payments that occur in January, most of which are reinvested in
the muni market.  Another source of demand is  corporations,  who buy back munis
that they sold in December for  Treasurys in order to dress up their  portfolios
for year-end review.

[pie charts]

   PORTFOLIO COMPOSITION BY CREDIT RATING (as of 11/30/96)

   SP1+ 79%
   SP1 21%

   PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/96)

   SP1+ 83%
   SP1 17%

Semiannual Report                                 Tax-Free Money Market        7


                             SCHEDULE OF INVESTMENTS
                              TAX-FREE MONEY MARKET

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------


 SHORT-TERM MUNICIPAL SECURITIES
Alaska--1.0%
$    890 Alaska Industrial Development and
           Export Auth. Rev., (Anchorage Fueling
           Project), VRDN, 3.95%, 12-4-96
           (LOC: Industrial Bank of Japan)     $  890
                                               ------

ARIZONA--1.1%
   1,000 East Valley Institute of Technology
           District No. 401, Series 1994 B,
           4.00%, 7-1-97 (AMBAC)                1,000
                                               ------   

CALIFORNIA--5.8%
   2,300 California Pollution Control Financing
           Auth. Rev., Series A, (Southern
           California Edison), VRDN,
           4.25%, 12-2-96 (LOC: Credit
           Lyonnais)                            2,300

   1,950 California Rev. Anticipation Notes,
           Series A, 4.50%, 6-30-97             1,956

   1,000 California Student Loan Program Rev.,
           Series A, VRDN, 3.60%, 12-5-96
           (LOC: Dresdner Bank, AG)             1,000
                                                -----  
                                                5,256
                                                -----  

COLORADO--5.0%
   1,000 Colorado Tax and Rev. Anticipation
           Notes, Series A, 4.50%, 6-27-97      1,003

   3,500 Denver Multi-Family Housing Rev.,
           Series A, (Cottonwood Creek
           Project), VRDN, 3.75%, 12-3-96
           (LOC: GE Capital Corp.)              3,500
                                                -----
                                                4,503
                                                -----

DISTRICT OF COLUMBIA--3.3%
   2,000 District of Columbia Rev., (Abraham
           and Laura Lisner Project), VRDN,
           3.60%, 12-4-96 (LOC:
           NationsBank of Georgia)              2,000

   1,000 District of Columbia Rev., (American
           University), VRDN, 3.55%, 12-4-96
           (LOC: National Westminster Bank)     1,000
                                                -----  
                                                3,000
                                                ----- 


                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

FLORIDA--19.7%
$  4,000 Alachua County Health Facility, VRDN,
           3.50%, 12-4-96 (MBIA) (SBBPA:
           Suntrust Bank Central Florida)    $  4,000
                                                
   1,250 Broward County Housing Finance Auth.
           Multi-Family Housing Rev., Series A,
           (Palmaire-Oxford), VRDN, 3.80%,
           12-4-96 (SBBPA: Continental
           Casualty Co.)                        1,250

   3,000 Florida Housing Finance Agency,
           (Village Place Project), VRDN,
           3.60%, 12-4-96 (LOC: Chemical
           Bank)                                3,000

   1,500 Florida Housing Finance Agency Rev.,
           (Oaks at Mill Creek Project), VRDN,
           3.60%, 12-4-96 (LOC: Chemical
           Bank)                                1,500

   2,000 Florida Housing Finance Agency Rev.,
           (Country Club Apartments), VRDN,
           4.15%, 12-2-96 (LOC: Northern
           Trust Corp.)                         2,000

   4,000 Florida Housing Finance Agency Rev.,
           (Beville-Oxford), VRDN, 3.80%,
           12-4-96 (SBBPA: Continental
           Casualty Co.)                        4,000

   2,000 Jacksonville Electric Rev. Commercial
           Paper, 3.50%, 1-24-97 (SBBPA:
           Morgan Guaranty Trust)               2,000
                                               ------
                                               17,750
                                               ------


GEORGIA--2.0%
   1,800 Cobb County Multi-Family Housing
           Rev., (Pittco Frey Association), VRDN,
           3.65%, 12-4-96 (LOC: GE Capital
           Corp.)                               1,800
                                                -----


HAWAII--1.5%
   1,300 Hawaii State Housing Finance and
           Development Corporation Rev.,
           (Affordable Rental Housing), VRDN,
           3.70%, 12-4-96 (LOC: Barclay's
           Bank)                                1,300
                                                -----

See Notes to Financial Statements

8    Tax-Free Money Market                        American Century Investments


                             SCHEDULE OF INVESTMENTS
                              TAX-FREE MONEY MARKET

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

ILLINOIS--10.0%
$  1,625 Bartlett Multi-Family Housing Rev.,
           Series A, (Barlett Square Apartments),
           VRDN, 3.55%, 12-5-96 (LOC:
           LaSalle National Bank)              $1,625

   1,400 Chicago Rev., Series A, (O'Hare
           International Airport), VRDN,
           12-2-96 (LOC: Westdeutsche
           Bank)                                1,400

   2,000 Illinois Health Facility Auth. Rev.,
           (Franciscan Elder Care), VRDN,
           3.60%, 12-4-96 (LOC: LaSalle
           National Bank)                       2,000

   4,000 Illinois Development Finance Auth.,
           VRDN, 3.55%, 12-6-96 (LOC:
           Northern Trust Corp.)                4,000
                                                -----

                                                9,025
                                                -----


INDIANA--1.7%
   1,000 Huntington Economic Development
           Rev., (Allied Signal Inc. Project),
           VRDN, 3.70%, 12-4-96 (LOC:
           Allied Signal, Inc.)                 1,000

     500 Lawrenceburg Multi-School Building
           Corporation Rev., 4.00%, 8-1-97
           (FSA)                                  500
                                                  ---

                                                1,500
                                                -----


IOWA--1.1%
   1,000 Iowa School Corporation Warrant
           Certificates, Series B, 4.25%,
           1-30-97 (FSA)                        1,001
                                                -----

KANSAS--2.2%
   2,000 Burlington Pollution Control Rev.,
           Series 1985 A, Commercial Paper,
           3.65%, 1-14-97 (LOC: Toronto
           Dominion Bank)                       2,000
                                                -----



                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

KENTUCKY--3.8%
$  1,000 Kentucky State Property and
           Buildings Rev., (Project No. 50),
           (Escrowed to Maturity), 6.20%,
           2-1-97(1)                           $1,005

   2,400 Mayfield Multi-City Lease Rev., VRDN,
           3.70%, 12-4-96 (LOC: PNC Bank)       2,400
                                                -----
                                                3,405
                                                -----


LOUISIANA--3.1%
     800 Louisiana Public Facility Auth. Rev.,
           (Green Briar Hospital), VRDN,
           3.60%, 12-4-96 (LOC: Societe
           Generale)                              800

   2,000 Calcasieu Parish Sales Tax District
           No. 4-A Sales and Use Tax, VRDN,
           3.65%, 12-5-96 (LOC: National
           Westminster Bank)                    2,000
                                                -----

                                                2,800
                                                -----


MASSACHUSETTS--1.1%
   1,000 Massachusetts Bay Transportation
           Auth. Rev., 3.625%, 3-1-97 (LOC:
           State Street Bank)                   1,000
                                                -----


MICHIGAN--4.3%
   1,900 Dearborn Economic Development
           Corporation Rev., VRDN, 3.65%,
           12-4-96 (LOC: Mellon Bank)           1,900

   2,000 Michigan Hospital Finance Auth. Rev.,
           Series A, (St. Mary Hospital of
           Livonia), VRDN, 3.65%, 12-4-96,
           (LOC: Comerica Bank)                 2,000
                                                -----

                                                3,900
                                                -----


MINNESOTA--2.2%
   2,000 Rosemount Independent School District
           GO, Series B, 5.50%, 2-1-97 (FGIC)   2,007
                                                -----  

See Notes to Financial Statements

Semiannual Report                                 Tax-Free Money Market        9



                             SCHEDULE OF INVESTMENTS
                              TAX-FREE MONEY MARKET

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

MISSOURI--3.9%
$  1,500 Kansas City Industrial Development
           Auth. Multi-Family Housing Rev.,
           (Willow Creek IV Apartments), VRDN,
           3.55%, 12-4-96 (FNMA Collateral)    $1,500
   2,000 Saint Charles County Industrial
           Development Auth. Rev., (Sun River
           Apartments Project), VRDN, 3.60%,
           12-5-96 (LOC: Bank of America)       2,000
                                                -----
                                                3,500
                                                -----


MONTANA--2.2%
   2,000 Montana Tax and Rev. Anticipation
           Notes, 4.50%, 6-27-97                2,009
                                                -----  

NEW MEXICO--1.1%
   1,000 Santa Fe Gross Receipts Tax Rev.
           Refunding, Series A, 3.90%, 6-1-97
           (AMBAC)                              1,000
                                                -----


NEW YORK--1.1%
   1,000 New York City GO, Series B, VRDN,
           4.25%, 12-2-96 (FGIC)                1,000
                                                -----

OHIO--2.8%
   2,500 Ohio Air Quality Development Auth.
           Pollution Control Rev., Series
           1988 B, 3.60%, 12-20-96 (FGIC)       2,500
                                                -----

SOUTH CAROLINA--4.5%
   4,000 Berkeley County Pollution Control Rev.
           Refunding, VRDN, 3.60%, 12-5-96
           (LOC: Royal Bank of Canada)          4,000
                                                -----


TENNESSEE--2.2%
   2,000 Chattanooga Industrial Development
           Rev., (Market Street Limited Project),
           VRDN, 3.55%, 12-4-96 (LOC:
           Credit Suisse)                       2,000
                                                -----


                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

TEXAS--12.2%
$    575 Arlington Hospital Auth. Rev.,
           (Arlington Memorial Hospital),
           5.50%, 12-1-97 (FSA)              $    585

     780 Houston Water and Sewer System
           Rev., 8.00%, 12-1-97, Prerefunded
           at 102% of Par(1)                      827

   4,000 Tarrant County Housing Finance
           Corporate Rev., (Multi-Family
           Housing-SF Apartments), VRDN,
           3.55%, 12-4-96 (LOC: Suntrust
           Bank, Nashville)                     4,000

   3,000 Texas Tax and Rev. Anticipation Notes,
           4.75%, 8-29-97                       3,018

   2,500 Waller County Industrial Development
           Rev., (Tubular Steel Project), VRDN,
           3.60%, 12-4-96 (LOC: Wachovia
           Bank)                                2,500
                                                -----

                                               10,930
                                               ------


WASHINGTON--1.1%
   1,000 Seattle Water System Rev., VRDN,
           3.55%, 12-4-96 (LOC: Bayerische
           Landesbank)                          1,000
                                                -----


TOTAL INVESTMENT SECURITIES--100.0%            $90,076
                                               =======



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  
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 November 30, 1996.
(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 YIELD (as of November 30, 1996)
<S>                                           <C>           <C>           <C>           <C>            <C>  
   Intermediate-Term Tax-Free                 4.08%         5.67%         5.91%         6.38%          6.75%


                                           6 MONTHS(2)     1 YEAR        3 YEARS       5 YEARS       10 YEARS


 AVERAGE ANNUAL RETURNS (as of November 30, 1996)(1)
   Intermediate-Term Tax-Free                  4.86%         4.93%         4.83%         6.51%          6.48%

   Lehman 5-Year General Obligation(3)         4.74%         5.37%         5.34%         6.58%          6.48%

   Average Intermediate Municipal
   Debt Fund(4)                                4.87%         4.71%         5.03%         6.51%          6.65%

   Fund's Ranking Among Intermediate
   Municipal Debt Funds(5)                     --      44 out of 135  52 out of 83  15 out of 33   11 out of 17



(1)  Returns are defined in the Glossary on page 37.
(2)  Not annualized.
(3)  See page 36 for more information about the fund's comparative index.
(4)  According to Lipper Analytical Services. See page 36 for more information about Lipper and the fund's category.
(5)  Rankings determined by Lipper based on average annual returns for the periods indicated.
</TABLE>

[mountain graph - data below]

   GROWTH OF $10,000 OVER A 10-YEAR PERIOD

   $10,000
   investment
   made 11/30/86

                  Intermediate-Term Tax-Free         Lehman 5-Year GO
   11/30/86      $10000                             $10000
   12/31/86       9950                               9969
   1/31/87        10183                              10162
   2/28/87        10248                              10254
   3/31/87        10186                              10196
   4/30/87        9729                               9894
   5/31/87        9759                               9893
   6/30/87        9962                               10102
   7/31/87        10146                              10219
   8/31/87        10129                              10238
   9/30/87        9759                               9894
   10/31/87       9852                               10040
   11/30/87       10048                              10160
   12/31/87       10174                              10272
   1/31/88        10483                              10525
   2/29/88        10571                              10632
   3/31/88        10492                              10591
   4/30/88        10573                              10688
   5/31/88        10515                              10559
   6/30/88        10569                              10636
   7/31/88        10623                              10684
   8/31/88        10621                              10653
   9/30/88        10731                              10757
   10/31/88       10853                              10850
   11/30/88       10781                              10793
   12/31/88       10849                              10822
   1/31/89        10975                              10978
   2/28/89        10872                              10861
   3/31/89        10820                              10792
   4/30/89        11006                              10977
   5/31/89        11192                              11177
   6/30/89        11283                              11299
   7/31/89        11445                              11464
   8/31/89        11379                              11419
   9/30/89        11366                              11425
   10/31/89       11462                              11435
   11/30/89       11646                              11580
   12/31/89       11748                              11675
   1/31/90        11778                              11680
   2/28/90        11832                              11767
   3/31/90        11786                              11731
   4/30/90        11730                              11693
   5/31/90        11971                              11906
   6/30/90        12076                              11994
   7/31/90        12236                              12136
   8/31/90        12071                              12095
   9/30/90        12104                              12120
   10/31/90       12342                              12299
   11/30/90       12538                              12476
   12/31/90       12553                              12522
   1/31/91        12777                              12706
   2/28/91        12872                              12822
   3/31/91        12855                              12792
   4/30/91        13012                              12952
   5/31/91        13100                              13018
   6/30/91        13067                              13016
   7/31/91        13173                              13146
   8/31/91        13351                              13315
   9/30/91        13556                              13479
   10/31/91       13657                              13581
   11/30/91       13676                              13624
   12/31/91       14015                              13930
   1/31/92        14024                              13957
   2/29/92        13973                              13966
   3/31/92        13918                              13919
   4/30/92        14032                              14042
   5/31/92        14184                              14168
   6/30/92        14423                              14372
   7/31/92        14879                              14749
   8/31/92        14653                              14638
   9/30/92        14797                              14730
   10/31/92       14650                              14682
   11/30/92       14890                              14860
   12/31/92       15022                              14963
   1/31/93        15247                              15125
   2/28/93        15755                              15519
   3/31/93        15467                              15343
   4/30/93        15613                              15442
   5/31/93        15640                              15496
   6/30/93        15892                              15706
   7/31/93        15837                              15717
   8/31/93        16175                              15930
   9/30/93        16381                              16045
   10/31/93       16412                              16069
   11/30/93       16274                              16023
   12/31/93       16550                              16242
   1/31/94        16747                              16395
   2/28/94        16327                              16088
   3/31/94        15925                              15729
   4/30/94        15986                              15888
   5/31/94        16098                              15977
   6/30/94        16053                              15941
   7/31/94        16265                              16114
   8/31/94        16318                              16192
   9/30/94        16151                              16070
   10/31/94       15971                              15980
   11/30/94       15756                              15878
   12/31/94       15971                              16018
   1/31/95        16229                              16171
   2/28/95        16542                              16406
   3/31/95        16690                              16667
   4/30/95        16769                              16712
   5/31/95        17128                              17078
   6/30/95        17130                              17091
   7/31/95        17311                              17331
   8/31/95        17445                              17506
   9/30/95        17512                              17558
   10/31/95       17684                              17632
   11/30/95       17867                              17782
   12/31/95       18000                              17880
   1/31/96        18208                              18092
   2/29/96        18160                              18031
   3/31/96        17913                              17935
   4/30/96        17905                              17908
   5/31/96        17878                              17887
   6/30/96        17962                              18013
   7/31/96        18160                              18133
   8/31/96        18167                              18170
   9/30/96        18309                              18307
   10/31/96       18486                              18477
   11/30/96       18744                              18734

   Value on 11/30/96

   Intermediate-
   Term Tax-Free
   $18,744

   Lehman
   5-Year GO
   $18,734



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 index's total return line does not.



 PORTFOLIO AT A GLANCE
                            11/30/96     5/31/96
Number of Issues               57          54
Weighted Average Maturity  7.23 years  7.15 years
Average Duration           5.33 years  5.44 years
Expense Ratio                0.67%*       0.70%

* Annualized.

See the Glossary on page 37.

Semiannual Report                                 Intermediate-Term Tax-Free  11


                           INTERMEDIATE-TERM TAX-FREE

Management Q&A

   An  interview  with  Joel  Silva,  a  municipal   portfolio   manger  on  the
Intermediate-Term Tax-Free fund management team.

How did the fund perform?

   The fund performed in line with its peers.  For the six months ended November
30, 1996,  the fund's total return was 4.86%,  compared  with the 4.87%  average
return  of the  142  "Intermediate  Municipal  Debt  Funds"  tracked  by  Lipper
Analytical  Services over the same period.  However,  the fund's one-year return
for the period ended November 30, 1996,  was 4.93%,  exceeding the 4.71% average
annual  return  of its  peers.  (See the  Average  Annual  Returns  table on the
previous page.)

What are some of the factors that contributed to the fund's  performance  during
the period?

   One   contributing   factor  was  the  fund's  large  contingent  of  premium
noncallable  bonds,  which performed even better than we had expected.  (Premium
bonds are bonds that trade at prices  above face value  because  their  interest
coupons are higher than the prevailing market interest rate.)  Noncallable bonds
cannot  be  repurchased  by the  issuer  prior to  maturity  and  replaced  with
lower-yielding  securities  if  interest  rates  decline.  We sold many of these
premium noncallable bonds near the end of the period at a substantial profit.

   In addition,  the fund's returns were enhanced by our strong credit  research
staff, which accurately assessed many specific credit situations  throughout the
U.S.  Thanks to our credit team's  diligent work, we purchased many  undervalued
securities that subsequently appreciated in value.

[bar graph - data below]

   INTERMEDIATE-TERM TAX-FREE FISCAL YEAR-BY-YEAR RETURNS (Periods ended May 31)

             Intermediate-Term Tax-Free     Lehman Five-Year General Obligation
   '87       6.03%                          6.7%
   '88       7.75                           6.73
   '89       6.44                           5.85
   '90       6.95                           6.53
   '91       9.43                           9.34
   '92       8.28                           8.83
   '93       10.26                          9.38
   '94       2.93                           3.1
   '95       6.4                            6.89
   '96       4.38                           4.74

This chart  illustrates  the  historical  year-by-year  volatility of the fund's
returns over the previous 10 years.  The fund's total returns include  operating
expenses, while the index's returns do not.

See page 36 for a definition of the fund's comparative index.

12   Intermediate-Term Tax-Free                   American Century Investments


                           INTERMEDIATE-TERM TAX-FREE

Why and how did you change the fund's position over the past six months?

   During the second  quarter of 1996,  we began to shorten  the fund's  average
maturity as evidence of a  strengthening  economy caused the market to sell off.
By the end of May, the average  maturity was down to 7.15 years, and it remained
close to that mark through the end of the period.  While  shortening  the fund's
average  maturity,  we sold some longer  discount bonds and used the proceeds to
purchase  premium  noncallable  bonds.  (Discount  bonds are bonds that trade at
prices  below face  value  because  their  interest  coupons  are lower than the
prevailing market interest rate.)

   While  moving to a more  neutral  stance,  we shifted  the  fund's  portfolio
holdings from a barbell  structure to a laddered  structure.  Though the barbell
benefited the fund during the bond market rally in late 1995 and early 1996, the
laddered  structure  will allow us to more  quickly  adjust the fund to changing
market conditions going forward.

In the fund's May 31, 1996 Annual  Report,  you mentioned that you had purchased
attractively priced California  municipal  securities.  How did those securities
perform?

   The fund's  California  securities  performed  very well.  We purchased  some
California  munis in the  aftermath of the Orange County  bankruptcy,  when many
California  munis  were  trading  at  relatively   inexpensive   prices.   While
specifically avoiding Orange County securities, we were able to find a number of
bargains in  California  while  maintaining a high level of credit  quality.  As
California's  economy  improved  during 1996,  these  securities  appreciated in
value, enhancing the fund's returns.


 TOP FIVE STATES (% of fund investments)
                 As of                      As of
                11/30/96                   5/31/96
 California        19%      Texas            19%
 Texas             17%      California       18%
 Washington        12%      Washington       12%
 Illinois           6%      Illinois          6%
 Oklahoma           5%      Wisconsin         5%

[pie charts]

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

   PORTFOLIO  COMPOSITION  BY SECURITY  TYPE (as of 5/31/96)  
     Revenue  Bonds 46%
     General Obligation 21% 
     Lease/COPs 10% 
     Other 23%

Semiannual Report                                 Intermediate-Term Tax-Free  13


                           INTERMEDIATE-TERM TAX-FREE

Would you explain the recent changes to the fund's investment parameters?

   Yes.  The  fund  can  now  hold  bonds  across  the  entire  investment-grade
category,  which includes securities rated AAA, AA, A and BBB.  Previously,  the
fund could invest only in securities  rated AAA, AA or A. The fund had been at a
competitive disadvantage because of this restriction,  so we expanded its credit
criteria to better  compete with the fund's peers and provide higher returns for
our shareholders. The change will also allow us to make better use of our strong
credit research team.

   In addition, effective January 1, 1997, the fund will be allowed to invest up
to 20% of its assets in "private  activity" bonds whose interest income is a tax
preference item under the federal alternative minimum tax (AMT).

What is the outlook for munis going forward?

   A spate of recent  reports  suggesting  the  economy may have picked up speed
during  the fourth  quarter  makes the  inflation  outlook  uncertain.  Consumer
confidence  reached a seven-year  high in December,  while  personal  income and
spending  rose,  as  did  U.S.  exports,  housing  purchases  and  manufacturing
activity.  Although  the  outlook for bonds in general is rather  uncertain,  we
expect  supply and demand  factors to continue  to work in munis'  favor for the
near future.

Given this outlook, what are your plans for the fund over the next six months?

   We will likely maintain the fund's neutral posture, lengthening or shortening
the fund's average maturity and duration in a narrow range when appropriate.  If
the economic outlook does change dramatically, we believe the fund is positioned
to respond appropriately.

[pie charts]

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

   PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/96)
   AAA 62%
   AA 19%
   A 19%

Investment terms are defined in the Glossary on page 37.

14   Intermediate-Term Tax-Free                   American Century Investments


                             SCHEDULE OF INVESTMENTS
                           INTERMEDIATE-TERM TAX-FREE

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------


 MUNICIPAL SECURITIES

ALABAMA-1.6%
$  1,000 Alabama Municipal Electric Power Auth.
           Rev., 6.10%, 9-1-99 (MBIA)        $  1,052
                                                -----

ALASKA--0.8%
     500 Anchorage Hospital Rev., Series 1991,
           (Sisters of Providence), 6.50%,
           10-1-99                                528
                                                  ---

ARIZONA--0.7%
     410 Pinal County Unified School District No.
           43 Apache Junction GO, Series A,
           6.80%, 7-1-08 (FGIC)                   479
                                                  ---

CALIFORNIA--19.4%
   1,250 California Health Facility Auth. Rev.
           Refunding, (Sisters of Providence),
           6.20%, 10-1-03 (MBIA)                1,372

   2,170 California Housing Finance Agency
           Rev., 5.60%, 8-1-09 (MBIA)           2,227

   1,000 California Public Works Board Lease
           Rev., 6.00%, 1-1-05 (AMBAC)          1,093

   1,100 California Public Works Board Rev.,
           (Various Universities), 6.15%,
           11-1-09                              1,179

   1,060 Ontario Redevelopment Finance Auth.
           Special Assessment, (Local Agency
           Series A), 5.90%, 9-2-07 (FSA)       1,141

   1,100 Sacramento Regional Transportation
           Certificates of Participation,
           Series A, 6.20%, 3-1-00              1,163

   1,000 Sacramento Schools Ins. Auth. Rev.,
           Worker's Compensation Program,
           Series C, 5.75%, 6-1-03              1,063

   1,000 San Bernardino County Certificates of
           Participation, 5.75%, 8-1-06 (MBIA)  1,080

   1,000 State of California GO, 5.75%,
           10-1-10                              1,065

   1,080 Y/S School Facility Finance Auth. Rev.,
           Series 1990, 5.65%, 9-1-06 (MBIA)    1,128
                                               ------
                                               12,511
                                               ------


                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

FLORIDA--2.5%
$    700 Broward County School District GO,
           6.75%, 2-15-00                     $   749

     775 Lakeland Electric and Water Rev.
           Refunding, Series B, 6.00%, 10-1-09,
           (FGIC)                                 854
                                                  ---

                                                1,603
                                                -----


GEORGIA--3.5%

   2,000 Fulton County Water and Sewer
           Rev. Refunding, 6.25%, 1-1-09
           (FGIC)                               2,237
                                                -----

HAWAII--1.7%
   1,000 Hawaii GO, Series A, (Escrowed to
           Maturity), 7.00%, 6-1-00 (FGIC)(1)   1,091
                                                -----

ILLINOIS--6.0%
   2,000 City of Chicago GO, (Emergency
           Telephone), 5.25%, 1-1-04 (FGIC)     2,073

     700 City of Chicago Metropolitan Water
           Reclamation District GO, 7.25%,
           1-1-99, Prerefunded at 100% of
           Par(1)                                 745

   1,000 Illinois Education Facility Auth. Rev.,
           Series A, (Loyola University), 6.30%,
           7-1-98                               1,035

      30 Metropolitan Pier and Exposition Auth.
           Rev., (McCormick Place Project),
           (Escrowed to Maturity), 5.20%,
           6-15-99(1)                              31
                                                -----       
                                                3,884
                                                -----


INDIANA--2.3%
     500 Indiana University Student Fee Rev.,
           Series F, 7.10%, 8-1-97                512

   1,000 South Montgomery Industrial Building
           Improvement Certificates of
           Participation, 4.06%(2), 1-1-98
           (AMBAC)                                957
                                                  ---

                                                1,469
                                                -----


MASSACHUSETTS--1.6%
   1,000 Massachusetts GO, Series B, 5.40%,
           11-1-07 (MBIA)                       1,052
                                                -----  

See Notes to Financial Statements

Semiannual Report                                 Intermediate-Term Tax-Free  15


                             SCHEDULE OF INVESTMENTS
                           INTERMEDIATE-TERM TAX-FREE

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

MICHIGAN--2.4%
$  1,500 Detroit Water Supply System Rev.,
           Series A, 5.30%, 7-1-09 (MBIA)      $1,530
                                                -----

NEW JERSEY--1.7%
   1,000 New Jersey Transportation Trust
           Fund Auth. Rev., Series A, 6.00%,
           12-15-05 (MBIA)                      1,101
                                                -----

NEW YORK--4.1%
   1,000 New York State Thruway Auth. Service
           Contract, 5.30%, 4-1-04              1,023

   1,000 New York State Urban Development
           Corp. Rev., 6.25%, 4-1-05 (MBIA)     1,105

     500 New York State Local Government
           Assistance, Series A, 6.00%, 4-1-07    542
                                                -----
                                                2,670
                                                -----


NORTH CAROLINA--3.4%
   2,000 North Carolina Eastern Municipal
           Power Agency Rev., Series 1993,
           6.00%, 1-1-06 (FSA)                  2,157
                                                -----

OHIO--1.7%
   1,000 Ohio State Building Auth. Rev., Series
           A, (Correctional Facility), 6.25%,
           10-1-00                              1,070
                                                -----

OKLAHOMA--4.5%
   2,500 Oklahoma Industrial Auth. Health
           System Rev. Refunding, Series
           1995 C, 7.00%, 8-15-04 (AMBAC)       2,883
                                                -----

PENNSYLVANIA--1.3%
     845 Philadelphia Water and Wastewater
           Rev., 5.00%, 6-15-12 (FGIC)            822
                                                -----

SOUTH CAROLINA--1.6%
   1,000 South Carolina Public Service Rev.,
           6.25%, 1-1-00 (AMBAC)                1,058
                                                -----


                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

TEXAS--16.8%

$    115 Austin County GO, 6.75%, 9-1-00,
           Prerefunded at Par(1)            $     125

     885 Austin County GO, Series C, 6.75%,
           9-1-01                                 959

     535 City of Austin Utility System Rev.,
           (Escrowed to Maturity), 7.50%,
           11-15-98(1)                            571

   1,500 Harris County Health Facility Memorial
           Hospital Rev., (Systems Project),
           6.80%, 6-1-01                        1,626

   1,000 Houston Independent School District
           GO, (Guaranteed by Texas Permanent
           School Fund), 8.375%, 8-15-98        1,074

   1,500 Houston Water and Sewer System Rev.,
           5.60%, 12-1-02 (MBIA)                1,595

     500 North Texas Higher Education Student
           Loan Rev., 6.875%, 4-1-02
           (AMBAC)                                532

   2,000 Texas Municipal Power Agency Rev.,
           5.75%, 9-1-02 (MBIA)                 2,137

   1,000 Texas Public Financing Agency GO,
           Series 1995, (Systems Project),
           6.50%, 10-1-03                       1,120

   1,000 Texas Turnpike Auth. Rev., Series
           1990 A, 7.00%, 1-1-99, Prerefunded
           at 102% of Par, (AMBAC)(1)           1,079
                                               ------
                                               10,818
                                               ------


UTAH--4.2%
   1,600 Utah Housing Finance Agency Single
           Family Mortgage Rev., 5.65%,
           7-1-06                               1,645

   1,000 Utah State MFC University Rev., Series
           1991, (Utah Hospital), 6.60%,
           5-15-00                              1,072
                                                -----
                                                2,717
                                                -----
See Notes to Financial Statements

16   Intermediate-Term Tax-Free                   American Century Investments


                             SCHEDULE OF INVESTMENTS
                           INTERMEDIATE-TERM TAX-FREE

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

VIRGINIA--1.6%
$  1,000 Virginia State Public Building Auth. Rev.
           Refunding, Series A, 5.70%, 8-1-00$  1,052
                                                -----

WASHINGTON--12.4%
   1,000 Pierce County School District No. 3 GO,
           Series B, 5.80%, 12-1-99             1,045

   1,000 Pierce County School District #320
           GO, 5.75%, 12-1-02                   1,060

   2,000 Snohomish County Public Utility
           District Rev., Series 1993, 5.625%,
           1-1-05 (FGIC)                        2,114

   1,000 Snohomish County School District #15
           GO, 6.125%, 12-1-03                  1,067

   1,000 Washington Public Power Supply
           System Rev., (Project #1), 5.50%,
           7-1-04 (FGIC)                        1,040

   1,000 Washington Public Power Supply
           System Rev., (Project #1), 7.10%,
           7-1-01 (FGIC)                        1,102

     500 Washington Public Power Supply
           System Rev., Series C, 7.00%,
           7-1-01 (FGIC)                          551
                                                -----
                                                7,979
                                                -----


WISCONSIN--3.4%
   1,000 Wisconsin State Health and
           Educational Facility Rev., (Aurora
           Medical Group), 6.00%, 11-15-10
           (FSA)                                1,085

   1,060 Wisconsin State Health Facility Rev.,
           Series B, (Wausau Hospital), 6.30%,
           8-15-00 (AMBAC)                      1,131
                                                -----
                                                2,216
                                                -----


TOTAL MUNICIPAL SECURITIES--99.2%              63,979
   (Cost $60,949)                              ------   



                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

 SHORT-TERM MUNICIPAL SECURITIES

FLORIDA--0.8%
$    500 University Athletic Association, Inc.
           Capital Improvement Rev., (University
           of Florida Stadium Project), VRDN,
           4.00%, 12-2-96, resets daily, final
           maturity 2-1-20 (LOC: Suntrust
           Bank Central Florida, N.A.)      $     500
                                            ---------
   (Cost $500)

TOTAL INVESTMENT SECURITIES--100.0%         $  64,479
   (Cost $61,449)                           =========


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
resets = The frequency  with which a  fixed-income  security's  coupon  changes,
     based  on  current  market  conditions  or an  underlying  index.  The more
     frequently a security resets, the less risk the investor is taking that the
     coupon will vary significantly from current market rates.
VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
     calculating  the  weighted  average  portfolio  maturity.   Rate  shown  is
     effective November 30, 1996.
(1) Escrowed in U.S. Government Securities.
(2) This  security is a  zero-coupon  municipal  bond.  The yield to maturity at
current  market  value is shown  instead of a stated  coupon  rate.  Zero-coupon
securities are purchased at a substantial discount from their value at maturity.

See Notes to Financial Statements

Semiannual 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 YIELD (as of November 30, 1996)
<S>                                           <C>           <C>           <C>           <C>            <C>  
   Long-Term Tax-Free                         4.70%         6.53%         6.81%         7.34%          7.78%


                                           6 MONTHS(2)     1 YEAR        3 YEARS       5 YEARS       10 YEARS


 AVERAGE ANNUAL RETURNS (as of November 30, 1996)(1)
   Long-Term Tax-Free                         6.54%         4.62%         5.15%         7.94%          6.82%

   Lehman Long-Term
   Municipal Bond(3)                          8.25%         6.68%         6.49%         8.80%          8.00%

   Average General Municipal
   Debt Fund(4)                               6.15%         4.91%         4.98%         7.36%          7.22%

   Fund's Ranking Among
   General Municipal Debt Funds(5)             --     149 out of 228  68 out of 161  17 out of 103  47 out of 63



(1)  Returns are defined in the Glossary on page 37.
(2)  Not annualized.
(3)  See page 36 for more information about the fund's comparative index.
(4)  According to Lipper Analytical Services. See page 36 for more information about Lipper and the fund's category.
(5)  Rankings determined by Lipper based on average annual returns for the periods indicated.
</TABLE>

[mountain graph - data below]

   GROWTH OF $10,000 OVER A 10-YEAR PERIOD

   $10,000
   investment
   made 11/30/86

                  Long-Term Tax-Free        Lehman Long-Term Muni
   11/30/86      $10000                    $10000
   12/31/86       9946                      9987
   1/31/87        10235                     10323
   2/28/87        10304                     10352
   3/31/87        10206                     10199
   4/30/87        9367                      9627
   5/31/87        9249                      9521
   6/30/87        9415                      9217
   7/31/87        9499                      9303
   8/31/87        9497                      9344
   9/30/87        9007                      8962
   10/31/87       8917                      8962
   11/30/87       9129                      9248
   12/31/87       9275                      9369
   1/31/88        9687                      9743
   2/29/88        9790                      9858
   3/31/88        9589                      9716
   4/30/88        9661                      9793
   5/31/88        9649                      9803
   6/30/88        9805                      9994
   7/31/88        9871                      10061
   8/31/88        9899                      10101
   9/30/88        10059                     10330
   10/31/88       10261                     10565
   11/30/88       10161                     10451
   12/31/88       10317                     10633
   1/31/89        10496                     10884
   2/28/89        10379                     10731
   3/31/89        10376                     10740
   4/30/89        10617                     11055
   5/31/89        10861                     11311
   6/30/89        10999                     11483
   7/31/89        11160                     11635
   8/31/89        10985                     11458
   9/30/89        10861                     11423
   10/31/89       11003                     11574
   11/30/89       11234                     11820
   12/31/89       11310                     11907
   1/31/90        11171                     11787
   2/28/90        11309                     11920
   3/31/90        11297                     11932
   4/30/90        11080                     11787
   5/31/90        11491                     12120
   6/30/90        11583                     12239
   7/31/90        11841                     12455
   8/31/90        11459                     12158
   9/30/90        11433                     12139
   10/31/90       11719                     12396
   11/30/90       11989                     12710
   12/31/90       12064                     12766
   1/31/91        12242                     12938
   2/28/91        12257                     13028
   3/31/91        12273                     13060
   4/30/91        12456                     13262
   5/31/91        12580                     13418
   6/30/91        12504                     13393
   7/31/91        12678                     13600
   8/31/91        12846                     13795
   9/30/91        13065                     13995
   10/31/91       13213                     14142
   11/30/91       13205                     14159
   12/31/91       13622                     14496
   1/31/92        13556                     14488
   2/29/92        13582                     14510
   3/31/92        13530                     14547
   4/30/92        13656                     14686
   5/31/92        13891                     14901
   6/30/92        14194                     15189
   7/31/92        14805                     15746
   8/31/92        14513                     15534
   9/30/92        14539                     15603
   10/31/92       14231                     15343
   11/30/92       14649                     15775
   12/31/92       14877                     15979
   1/31/93        15058                     16130
   2/28/93        15854                     16880
   3/31/93        15548                     16677
   4/30/93        15830                     16905
   5/31/93        15920                     17045
   6/30/93        16211                     17365
   7/31/93        16146                     17383
   8/31/93        16624                     17828
   9/30/93        16870                     18059
   10/31/93       16856                     18094
   11/30/93       16645                     17875
   12/31/93       16998                     18336
   1/31/94        17195                     18552
   2/28/94        16669                     17938
   3/31/94        15963                     16867
   4/30/94        15976                     16997
   5/31/94        16165                     17196
   6/30/94        16064                     16990
   7/31/94        16410                     17426
   8/31/94        16401                     17463
   9/30/94        16153                     17058
   10/31/94       15835                     16534
   11/30/94       15588                     16098
   12/31/94       15952                     16669
   1/31/95        16392                     17402
   2/28/95        16839                     18111
   3/31/95        16980                     18328
   4/30/95        16964                     18319
   5/31/95        17506                     19099
   6/30/95        17293                     18748
   7/31/95        17420                     18843
   8/31/95        17593                     19109
   9/30/95        17730                     19258
   10/31/95       18076                     19724
   11/30/95       18497                     20233
   12/31/95       18775                     20549
   1/31/96        18815                     20637
   2/29/96        18637                     20385
   3/31/96        18253                     20012
   4/30/96        18145                     19932
   5/31/96        18163                     19942
   6/30/96        18364                     20250
   7/31/96        18532                     20451
   8/31/96        18548                     20424
   9/30/96        18841                     20878
   10/31/96       19039                     21133
   11/30/96       19353                     21587

   Value on 11/30/96
   Lehman Long-
   Term Muni
   $21,587

   Long-Term
   Tax-Free
   $19,353

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 index's total return line does not.



 PORTFOLIO AT A GLANCE
                            11/30/96     5/31/96
Number of Issues               42          36
Weighted Average Maturity  18.46 years 17.28 years
Average Duration           8.20 years  8.04 years
Expense Ratio                0.68%*       0.70%

* Annualized.

See 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, vice president and a senior portfolio manager
on the Long-Term Tax-Free fund management team.

How did the fund perform?

   The fund  outperformed  its peers for the six months ended November 30, 1996,
posting a total return of 6.54%,  which exceeded the 6.15% average return of the
233 "General  Municipal Debt Funds" tracked by Lipper  Analytical  Services over
the same period.  However,  the fund's one-year return of 4.62% lagged the 4.91%
average annual return of its peer group for the period ended November 30, 1996.
(See the Average Annual Return table on the previous page.)

Why did the fund perform well relative to its peers over the last six months?

   One   contributing   factor  was  the  fund's  large  contingent  of  premium
noncallable  bonds,  which performed even better than we had expected.  (Premium
bonds are bonds that trade at prices  above face value  because  their  interest
coupons are higher than the prevailing market interest rate.)  Noncallable bonds
cannot  be  repurchased  by the  issuer  prior to  maturity  and  replaced  with
lower-yielding  securities  if  interest  rates  decline.  We sold many of these
premium noncallable bonds near the end of the period at a substantial profit.

   In addition,  the fund's returns were enhanced by our strong credit  research
staff, which accurately assessed many specific credit situations  throughout the
U.S.  Thanks to our credit team's  diligent work, we purchased many  undervalued
securities that subsequently appreciated in value.

[bar graph - data below]

   LONG-TERM TAX-FREE FISCAL YEAR-BY-YEAR RETURNS (Periods ended May 31)
                  Long-Term Tax-Free        Lehman Long-Term Muni Bond
   '87            2.39%                     5.83%
   '88            4.32                      2.97
   '89            12.56                     15.38
   '90            5.8                       7.15
   '91            9.48                      10.71
   '92            10.42                     11.05
   '93            14.61                     14.39
   '94            1.54                      0.89
   '95            8.29                      11.07
   '96            3.75                      4.41

This chart  illustrates  the  historical  year-by-year  volatility of the fund's
returns over the previous 10 years.  The fund's total returns include  operating
expenses, while the index's returns do not.

See page 36 for a definition of the fund's comparative index.

Semiannual Report                                      Long-Term Tax-Free     19


                               LONG-TERM TAX-FREE

Why did the fund underperform its peers over the last twelve months?

   The primary  reason was that  we kept the fund's duration longer than that of
many of its peers  heading into 1996  because we  anticipated  a weakening  U.S.
economy and lower interest rates from the Federal Reserve.  Market  expectations
for interest rates changed in mid-February  1996, when economic reports showed a
surprisingly resilient U.S. economy. In a rising interest rate environment,  the
fund's longer duration caused it to experience more price depreciation than many
of its peers.

Why and how did you change the fund's position over the past six months?

   During the second  quarter of 1996,  we began to shorten  the fund's  average
maturity as evidence of a  strengthening  economy caused the market to sell off.
By mid-June,  the average  maturity was down to 17 years.  While  shortening the
fund's  average  maturity,  we sold  some  longer  discount  bonds  and used the
proceeds to purchase premium  noncallable bonds.  (Discount bonds are bonds that
trade at prices below face value because their  interest  coupons are lower than
the prevailing market interest rate.)

   While  moving to a more  neutral  stance,  we shifted  the  fund's  portfolio
holdings from a barbell  structure to a laddered  structure.  Though the barbell
benefited the fund during the bond market rally in late 1995 and early 1996, the
laddered  structure  will allow us to more  quickly  adjust the fund to changing
market conditions going forward.

Why did you decrease the fund's electric utilities holdings during the period?

   We are rotating out of this sector because of pressure on electric  utilities
from deregulation. The federal government enacted legislation intended to create
competition among electric utilities companies in 1992. Deregulation will likely
cause  sweeping  changes as companies  restructure  in an attempt to become more
competitive.  Until the full impact of deregulation is known,  we'll continue to
take a very cautious approach to paper issued by electric utilities.  We put the
money from the sale of our electric  utilities  holdings to work in what we feel
to be more stable investments, such as general obligation bonds.


 TOP FIVE STATES (% of fund investments)
                 As of                      As of
                11/30/96                   5/31/96
 Illinois          16%      Illinois         19%
 Washington         9%      Washington       14%
 California         9%      Texas             8%
 Texas              8%      Massachussetts    8%
 Florida            8%      South Carolina    7%

[pie charts]

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

   PORTFOLIO  COMPOSITION  BY SECURITY  TYPE (as of 5/31/96)  
     Revenue  Bonds 64%
     Prerefunded 11% 
     Other 25%

20   Long-Term Tax-Free                           American Century Investments


                               LONG-TERM TAX-FREE


Would you explain the recent changes to the fund's investment parameters?

   Yes.  The  fund  can  now  hold  bonds  across  the  entire  investment-grade
spectrum,  which includes securities rated AAA, AA, A and BBB.  Previously,  the
fund could  invest  only in  securities  rated  AAA,  AA or A. The fund was at a
competitive disadvantage because of this restriction,  so we expanded its credit
criteria to better  compete with the fund's peers and provide higher returns for
our shareholders. The change will also allow us to make better use of our strong
credit research team.
 
  In addition, effective January 1, 1997, the fund will be allowed to invest up
to 20% of its assets in "private  activity" bonds whose interest income is a tax
preference item under the federal alternative minimum tax (AMT).

What is the outlook for munis going forward?

   A spate of recent  reports  suggesting  the  economy may have picked up speed
during  the fourth  quarter  makes the  inflation  outlook  uncertain.  Consumer
confidence  reached a seven-year  high in December,  while  personal  income and
spending  rose,  as  did  U.S.  exports,  housing  purchases  and  manufacturing
activity.  Although  the  outlook for bonds in general is rather  uncertain,  we
expect  supply and demand  factors to continue  to work in munis'  favor for the
near future.

Given this outlook, what are your plans for the fund over the next six months?

   We will likely maintain the fund's neutral posture, lengthening or shortening
the fund's average maturity and duration in a narrow range when appropriate.  If
the  economic  outlook  does  change  significantly,  we  believe  the  fund  is
positioned to respond appropriately.

[pie charts]

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

   PORTFOLIO COMPOSITION BY CREDIT RATING (as of 5/31/96)
   AAA 57%
   AA 34%
   A 9%

Investment terms are defined in the Glossary on page 37.

Semiannual Report                                        Long-Term Tax-Free   21



                             SCHEDULE OF INVESTMENTS
                               LONG-TERM TAX-FREE

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------


 MUNICIPAL SECURITIES

ALABAMA --3.1%
$  2,000 Alabama Special Care Facility
           Financing Auth. Rev., (Daughters
           of Charity), 5.00%, 11-1-25         $1,830
                                                -----

ARIZONA--3.1%
   1,750 Phoenix Civic Improvement Corporation
           Water System Rev., 6.00%, 7-1-19     1,811
                                                -----

CALIFORNIA--7.9%
   3,270 California State Building Auth. Lease
           Rev., Series A, (San Francisco Civic
           Center Complex), 5.25%, 12-1-16
           (AMBAC)                              3,201

   1,700 Los Angeles Wastewater Rev., Series
           1993 D, 4.70%, 11-1-19 (FGIC)        1,517
                                                -----
                                                4,718
                                                -----


FLORIDA--5.6%
     890 Broward County Resource Recovery
           Facility Rev., Series 1984, (South
           Project), 7.95%, 12-1-08               984

   1,000 Orlando Water and Electric Auth.
           Rev., Series D, 6.75%, 10-1-17       1,192

   1,000 St. Petersburg Health Auth. Rev.,
           (Allegheny Health), 7.00%, 12-1-15
           (MBIA)                               1,125
                                                -----

                                                3,301
                                                -----


GEORGIA--1.9%
   1,000 Georgia Municipal Electric Auth.
           Rev., 6.50%, 1-1-12 (MBIA)           1,133
                                                -----



                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

ILLINOIS--15.9%
$  1,965 Chicago Metropolitan Water
           Reclamation District Capital
           Improvement, 6.25%, 12-1-14         $2,094

   1,500 Illinois Dedicated Tax Rev., (Civic
           Center Project), 6.25%, 12-15-20
           (AMBAC)                              1,669

   1,500 Illinois Development Finance Auth.
           Pollution Control Rev., Series B,
           (Central Illinois Public Service),
           7.60%, 3-1-14                        1,640

   1,840 Illinois Health Facilities Auth. Rev.
           Refunding, Series C, (Evangelical
           Hospital), 6.75%, 4-15-12            1,959

   2,000 Springfield Water Rev., 6.50%, 3-1-15  2,098
                                                -----
                                                9,460
                                                -----


INDIANA--3.9%
   1,000 Indiana Municipal Power Agency Rev.,
           Series A, 7.10%, 1-1-00,
           Prerefunded at 102% of Par,
           (AMBAC)(1)                           1,102

   1,000 Indiana Transportation Financing Auth.
           Highway Rev., Series A, 7.25%,
           6-1-15                               1,213
                                                -----
                                                2,315
                                                -----


MASSACHUSETTS--6.8%
   1,000 Massachusetts Health and Education
           Auth. Rev., Series F, 6.25%, 7-1-12
           (AMBAC)                              1,110

   1,115 Massachusetts Housing Finance
           Agency Rev., Series 1993 A,
           6.375%, 4-1-21                       1,141

   1,690 Massachusetts Housing Finance
           Agency Rev., Series 1992 H, 6.75%,
           11-15-12 (FNMA)                      1,792
                                                -----
                                                4,043
                                                -----
See Notes to Financial Statements

22   Long-Term Tax-Free                           American Century Investments



                             SCHEDULE OF INVESTMENTS
                               LONG-TERM TAX-FREE

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------


NEW YORK--3.1%
$  2,000 New York State Urban Development
           Corporation Rev., (Correctional
           Facilities), Series 4, 5.375%, 
           1-1-23                              $1,860
                                                -----

PENNSYLVANIA--3.1%
   2,000 Pennsylvania Intergovernmental Special
           Tax Rev., 5.00%, 6-15-22 (MBIA)      1,860
                                                -----

RHODE ISLAND--3.9%
   1,100 Rhode Island Clean Water Safe
           Drinking, 6.70%, 1-1-15 (AMBAC)      1,233

   1,000 Rhode Island Depositors Economic
           Special Obligation, 6.25%, 8-1-16
           (MBIA)                               1,108
                                                -----

                                                2,341
                                                -----


SOUTH CAROLINA--6.8%
   1,000 Columbia Water and Sewer Rev.,
           7.10%, 2-1-01, Prerefunded at
           102% of Par(1)                       1,126

   1,500 Piedmont Municipal Power Agency
           Electric Rev., 6.75%, 1-1-19 (FGIC)  1,771

     860 Piedmont Municipal Power Agency
           Electric Rev. Refunding, Series
           1991 A, 6.50%, 1-1-16 (FGIC)           980

     140 Piedmont Municipal Power Agency
           Electric Rev. Refunding, Series
           1991 A, (Escrowed to Maturity),
           6.50%, 1-1-16(1)                       160
                                                  ---
                                                4,037
                                                -----


TEXAS--8.3%
     600 Lower Colorado River Auth. Rev.
           Refunding, (Escrowed to Maturity),
           5.25%, 1-1-15(1)                       599

   2,000 San Antonio Electric and Gas System
           Rev., 5.31%(2), 2-1-09 (FGIC)        1,057

   1,000 Tarrant County Health Facility Rev.,
           6.00%, 5-15-11 (MBIA)                1,083

   1,960 Texas Municipal Power Agency Rev.,
           Series A, 6.75%, 9-1-12 (AMBAC)      2,176
                                                -----
                                                4,915
                                                -----


                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

UTAH--2.1%
$  1,000 Salt Lake City Hospital Rev. Refunding,
           Series A, (Intermountain Health
           Corporation), (Escrowed to Maturity),
           8.125%, 5-15-15(1)                  $1,217
                                                -----

VIRGINIA--4.9%
   1,000 Hampton Industrial Development Auth.
           Rev., Series A, (Sentara General
           Hospital), 6.50%, 11-1-12            1,058

   1,750 Virginia State Housing Development
           Auth. Rev., Series F, (Single Family
           Mortgage), 7.10%, 1-1-17             1,835
                                                -----
                                                2,893
                                                -----


VERMONT--3.5%
   2,000 Vermont Education and Health
           Buildings Financing Agency Rev.,
           6.00%, 11-1-13                       2,067
                                                -----

WASHINGTON--9.3%
   1,405 Port of Seattle Rev., 7.50%, 12-1-00,
           Prerefunded at 102% of Par,
           (AMBAC)(1)                           1,591

   1,625 Seattle Metropolitan Sewer Rev.,
           Series T, 6.875%, 1-1-13             1,746

   1,000 Washington Public Power Supply
           System Rev., Series 1990 C,
           5.70%, 7-1-12 (AMBAC)                1,017

   1,000 Washington State GO, Series A,
           6.75%, 2-1-15                        1,176
                                                -----
                                                5,530
                                                -----


WISCONSIN--3.8%
   1,900  Wisconsin State Clean Water Rev.,
           6.875%, 6-1-11                       2,240
                                                -----

TOTAL MUNICIPAL SECURITIES--97.0%              57,571
   (Cost $53,989)                              ------


See Notes to Financial Statements

Semiannual Report                                        Long-Term Tax-Free   23



                             SCHEDULE OF INVESTMENTS
                               LONG-TERM TAX-FREE

NOVEMBER 30, 1996 (UNAUDITED)

                                             Value
Principal Amount                       ($ in Thousands)
- --------------------------------------------------------------------------------

 SHORT-TERM MUNICIPAL SECURITIES

ARIZONA--0.2%
$    100 Phoenix Industrial Dev. Auth.
           Multifamily Housing Rev. Refunding,
           (Ventana Palms Apartments), VRDN,
           3.65%, 12-4-96, resets monthly,
           final maturity 2-1-24            $     100
                                                  ---

CALIFORNIA--0.8%
     500 California Statewide Communities
           Refunding, VRDN, 4.10%, 12-2-96,
           resets daily, final maturity 6-1-26    500
                                                  ---

FLORIDA--2.0%
   1,200 Jacksonville Pollution Control Rev.
            Refunding, (Florida Power and
           Light Company), VRDN, 4.10%,
           12-2-96, resets daily, final
           maturity 5-1-29                      1,200
                                                -----

TOTAL SHORT-TERM
MUNICIPAL SECURITIES--3.0%                      1,800
   (Cost $1,800)                                -----


TOTAL INVESTMENT SECURITIES-100.0%            $59,371
   (Cost $55,789)                             =======

Notes to Schedule of Investments 
AMBAC = AMBAC Indemnity Corp.
FGIC = Financial Guaranty Insurance Company
FNMA = Federal National Mortgage Association
GO = General Obligation
MBIA = Municipal Bond Insurance Association
resets = The frequency  with which a  fixed-income  security's  coupon  changes,
     based  on  current  market  conditions  or an  underlying  index.  The more
     frequently a security resets, the less risk the investor is taking that the
     coupon will vary significantly from current market rates.
VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
     calculating  the  weighted  average  portfolio  maturity.   Rate  shown  is
     effective November 30, 1996.
(1)  Escrowed in U.S. Government Securities.
(2)  This security is a  zero-coupon  municipal  bond.  The yield to maturity at
     current market value is shown instead of a stated coupon rate.  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



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

NOVEMBER 30, 1996 (UNAUDITED)

 ASSETS                                                                $ In Thousands, Except Per Share Amounts
<S>                                                                        <C>            <C>             <C>  
Investment securities, at value
  (amortized cost for Tax-Free Money Market; identified cost
  of $61,449, and $55,789, respectively) ........................ $     90,076     $     64,479     $    59,371
Cash ............................................................          816               --              --
Investment in affiliated money market fund (Note 2) .............           --               --             801
Interest receivable .............................................          493            1,217           1,028
Prepaid expenses and other assets ...............................            1                1              --
                                                                        ------           ------          ------
                                                                        91,386           65,697          61,200
                                                                        ------           ------          ------


 LIABILITIES
Disbursements in excess of demand deposit cash ..................          125              441           1,024
Payable for investments purchased ...............................           --              539           3,188
Payable for shares redeemed .....................................           79               31              22
Dividends payable ...............................................           10               18               8
Payable to affiliates (Note 2) ..................................           49               35              29
Accrued expenses and other liabilities. .........................            1                1               2
                                                                           ---            -----           -----
                                                                           264            1,065           4,273
                                                                           ---            -----           -----
Net Assets Applicable to Outstanding Shares ......................$     91,122     $     64,632     $    56,927
                                                                  ============     ============     ===========


 CAPITAL SHARES $1.00, $10.00, AND $10.00 PAR VALUE, RESPECTIVELY
Outstanding (Unlimited number of shares authorized) 
   (in thousands) ...............................................       91,122            5,926           4,856
                                                                        ======            =====           =====
Net Asset Value Per Share ........................................$       1.00     $      10.91     $     11.72
                                                                  ============     ============     ===========


 NET ASSETS CONSIST OF:
Capital (par value and paid-in surplus) ..........................$     91,122     $     61,895     $    53,576
Accumulated net realized (loss) on investment transactions .......          --            (293)           (231)
Net unrealized appreciation on investments (Note 3) ..............          --            3,030           3,582
                                                                        ------           ------          ------
                                                                  $     91,122     $     64,632     $    56,927
                                                                  ============     ============     ===========

</TABLE>

See Notes to Financial Statements

Semiannual Report                     Statement of Assets and Liabilities     25

<TABLE>
<CAPTION>

                            STATEMENTS OF OPERATIONS

                                                                                       INTERMEDIATE-
                                                                     TAX-FREE              TERM           LONG-TERM
FOR THE SIX MONTHS ENDED NOVEMBER 30, 1996 (UNAUDITED)             MONEY MARKET          TAX-FREE         TAX-FREE

 INVESTMENT INCOME                                                                    $ In Thousands
Income:
<S>                                                               <C>              <C>              <C>        
  Interest ...................................................... $      1,613     $      1,750     $     1,578
                                                                  ------------     ------------     -----------

Expenses (Note 2):
Investment advisory fee .........................................          197              136             115
Administrative fees .............................................           44               30              26
Transfer agency fees ............................................           31               22              21
Printing and postage ............................................           12                7               6
Custodian fees ..................................................           10                6               7
Auditing and legal fees .........................................           12                9               8
Registration and filing fees ....................................           14               11              12
Directors' fees and expenses ....................................            4                3               2
Other operating expenses ........................................            6               10               8
                                                                             -               --               -
  Total expenses ................................................          330              234             205
Amount (waived) (Note 2) ........................................         (22)             (21)            (23)
Custodian earnings credits (Note 4) .............................          (4)              (2)             (2)
                                                                           --               --              -- 
  Net expenses ..................................................          304              211             180
                                                                           ---              ---             ---
Net investment income ...........................................        1,309            1,539           1,398
                                                                         -----            -----           -----


 REALIZED AND UNREALIZED GAIN

 ON INVESTMENTS (NOTE 3)
Net realized gain on investments ................................           --              145             196
Change in net unrealized appreciation on investments ............           --            1,310           1,870
                                                                         -----            -----           -----

Net realized and unrealized
gain on investments .............................................           --            1,455           2,066
                                                                         -----            -----           -----
Net Increase in Net Assets
Resulting from Operations ....................................... $      1,309     $      2,994     $     3,464
                                                                  ============     ============     ===========
</TABLE>

See Notes to Financial Statements

26   Statements of Operations                     American Century Investments

<TABLE>
<CAPTION>

                       STATEMENTS OF CHANGES IN NET ASSETS

                                                                                         INTERMEDIATE-
                                                                    TAX-FREE                 TERM                 LONG-TERM
                                                                  MONEY MARKET             TAX-FREE                TAX-FREE
SIX MONTHS ENDED NOVEMBER 30, 1996 (UNAUDITED)
AND YEAR ENDED MAY 31, 1996


                                                                Nov. 30,     May 31,    Nov. 30,    May 31,    Nov. 30,    May 31,
Increase (Decrease) in Net Assets                                 1996        1996        1996       1996        1996       1996

                                                                                        $ In Thousands 
 OPERATIONS
<S>                                                            <C>         <C>         <C>         <C>         <C>         <C>     
Net investment income ......................................   $  1,309    $  2,878    $  1,539    $  3,047    $  1,398    $  2,702
Net realized gain on investment transactions ...............       --          --           145         346         196         735
Change in net unrealized appreciation
  (depreciation) on investments ............................       --          --         1,310        (671)      1,870      (1,549)
                                                                  -----       -----       -----        ----       -----      ------ 
Net increase in net assets resulting from operations .......      1,309       2,878       2,994       2,722       3,464       1,888
                                                                  -----       -----       -----       -----       -----       -----


 DISTRIBUTIONS TO SHAREHOLDERS
From net investment income .................................     (1,309)     (2,878)     (1,539)     (3,047)     (1,398)     (2,702)
                                                                 ------      ------      ------      ------      ------      ------ 


 CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ..................................     37,877      93,329       4,843      12,956      32,252      64,940
Proceeds from reinvestment of distributions ................      1,240       2,751       1,173       2,324       1,055       2,023
Payments for shares redeemed ...............................    (39,113)    (96,996)     (5,739)    (16,958)    (29,828)    (62,081)
                                                                -------     -------      ------     -------     -------     ------- 
Net increase (decrease) in net assets
  from capital share transactions ..........................          4        (916)        277      (1,678)      3,479       4,882
                                                                      -        ----         ---      ------       -----       -----
Net increase (decrease) in net assets ......................          4        (916)      1,732      (2,003)      5,545       4,068


 NET ASSETS
Beginning of period ........................................     91,118      92,034      62,900      64,903      51,382      47,314
                                                                 ------      ------      ------      ------      ------      ------

End of period ..............................................   $ 91,122    $ 91,118    $ 64,632    $ 62,900    $ 56,927    $ 51,382
                                                               ========    ========    ========    ========    ========    ========


 TRANSACTIONS IN SHARES OF THE FUNDS: (IN THOUSANDS)
Sold .......................................................     37,877      93,329         451       1,197       2,820       5,612
Issued in reinvestment of distributions ....................      1,240       2,751         109         215         108         175
Redeemed ...................................................    (39,113)    (96,996)       (535)     (1,570)     (2,622)     (5,361)
                                                                -------     -------        ----      ------      ------      ------ 
Net increase (decrease) ....................................          4        (916)         25        (158)        306         426
                                                                =======     =======        ====      ======      ======      ======
</TABLE>

See Notes to Financial Statements

Semiannual Report                       Statements of Changes in Net Assets   27


                          NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)


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.   Benham  Tax-Free  Money  Market  Fund  (Money  Market  Fund),  Benham
Intermediate-Term  Tax-Free Fund (Intermediate-Term  Fund), and Benham Long-Term
Tax-Free  Fund  (Long-Term  Fund)  (the  Funds)  are  three of the  eight  funds
composing  the  Trust.  The Funds  are  diversified  under  the 1940 Act.  Their
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 municipal obligations and maintains a weighted average maturity of
60  days  or   less.   The   Intermediate-Term   Fund   invests   primarily   in
intermediate-term   municipal  obligations  and  maintains  a  weighted  average
maturity  from five to ten  years.  The  Long-Term  Fund  invests  primarily  in
long-term municipal obligations and maintains a weighted average maturity of ten
or more years. 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 the Money Market Fund are valued at
amortized cost, which approximates current market value.  Securities held by the
Intermediate-Term  Fund and the Long-Term Fund (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 the Money Market
Fund.

   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 Intermediate-Term Fund and Long-Term Fund are declared daily and distributed
monthly.  Distribution  from net realized gains for these Funds 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.

   At May 31, 1996, accumulated net realized capital loss carryovers of $420,126
for the  Intermediate-Term  Fund and $427,920 for the Long-Term  Fund  (expiring
2003 through 2004) 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  directors 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  option  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  change  in value of the
contract  may  not  correlate  with  the  changes  in  value  of the  underlying
securities.  Upon  entering  into a futures  contract,  


28   Notes to Financial Statements                American Century Investments


                         NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)

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 unrealized gains and losses.  The Fund recognizes a realized gain or
loss when the contract is closed or expires.

   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.

          .50% of the first $100 million  
          .45% of the next $100 million 
          .40% of the next $100 million  
          .35% of the next $100 million 
          .30% of the next $100 million  
          .25% of the next $1 billion  
          .24% of the next $1 billion
          .23% of the next $1 billion  
          .22% of the next $1 billion  
          .21% of the next $1 billion 
          .20% of the next $1 billion
         .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  agreement  was  formerly  with Benham
Financial Services, Inc.

   The  Trust  has an  additional  agreement  with BMC  pursuant  to  which  BMC
established a contractual expense guarantee that limits Fund expenses (excluding
expenses such as brokerage  commissions,  taxes,  interest,  custodian  earnings
credits, and extraordinary expenses) to .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
expense guarantee rate is subject to renewal in June 1997.

   The  payables to  affiliates  as of  November  30,  1996,  based on the above
agreements, were as follows:

                              Tax-Free     Intermediate-  Long-Term
                            Money Market     Term Tax-    Tax-Free
                                Fund         Free Fund      Fund
   Investment Advisor ........ $ 33,617      $ 23,942     $ 19,219
   Administrative Services ...   11,867         8,424        7,617
   Transfer Agent ............    3,964         2,691        2,295
                                -------       -------      -------
                               $ 49,448      $ 35,057     $ 29,131
                                =======       =======      =======


   As of November 30, 1996, the Long-Term  Fund had invested  $801,000 in shares
of the Money Market Fund. The terms of the  transaction  were identical to those
with nonrelated  entities except that, to avoid duplicative  investment advisory
fees and  administrative  fees,  the Long-Term  Fund did not pay BMC  investment
advisory  fees or ACSC  administrative  fees with respect to assets  invested in
shares of the Money Market Fund.

   The Trust has a Distribution  Agreement with ACIS,  which is responsible  for
promoting  sales of and  distributing  the Trust's  shares.  This  agreement was
formerly with Benham Distributors, Inc.

Semiannual Report                            Notes to Financial Statements    29


                         NOTES TO FINANCIAL STATEMENTS

NOVEMBER 30, 1996 (UNAUDITED)

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

   The  aggregate  cost  of  municipal  debt  obligations  purchased  (excluding
short-term  investments)  for the  six-months  ended  November 30, 1996, for the
Intermediate-Term  Fund and Long-Term Fund totaled  $8,136,236 and  $21,275,790,
respectively.  The proceeds from sales of municipal debt obligations  (excluding
short-term  investments)  for the six months ended  November  30, 1996,  for the
Intermediate-Term  Fund and Long-Term Fund totaled  $7,026,515 and  $13,845,570,
respectively.

   As of November 30,  1996,  accumulated  net  unrealized  appreciation  of the
Intermediate-Term  Fund  and  Long-Term  Fund  were  $3,030,291  and  $3,582,084
consisting  of  unrealized  appreciation  of  $3,030,291  and  $3,654,076,   and
unrealized depreciation of $0 and $71,992,  respectively.  The aggregate cost of
investments  for  federal  income  tax  purposes  was the  same as the  cost for
financial reporting purposes.

- --------------------------------------------------------------------------------
4. Expense Offset Arrangements

   Each Fund's  Statement of Operations  reflects  custodian  earnings  credits.
These  amounts are used to offset the custody  fees  payable by the Funds to the
custodian  bank.  The credits  are earned  when the Fund  maintains a balance of
uninvested  cash at the custodian  bank.  Beginning  with the year ended May 31,
1996,  the  ratios of  operating  expenses  to average  net assets  shown in the
Financial Highlights are calculated as if these credits had not been earned.

- --------------------------------------------------------------------------------
5. Subsequent Events

   The following name changes became effective January 1, 1997:

<TABLE>

                        NEW NAMES                                   FORMER NAMES
<S>                    <C>                                         <C>
   Fund's Issuer:       American Century Municipal Trust            Benham Municipal Trust
   Fund:                American Century - Benham Tax-Free          Benham National Tax-Free Money Market Fund
                        Money Market Fund
                        American Century - Benham                   Benham National Tax-Free Intermediate-Term Fund
                        Intermediate-Term Tax-Free Fund
                        American Century - Benham                   Benham National Tax-Free Long-Term Fund
                        Long-Term Tax-Free Fund
   Parent Company:      American Century Companies, Inc.            Twentieth Century Companies, Inc.
   Distributor:         American Century Investment Services, Inc.  Twentieth Century Securities, Inc.
   Transfer Agent:      American Century Services Corporation       Twentieth Century Services, Inc.
</TABLE>

30   Notes to Financial Statements                American Century Investments
<TABLE>
<CAPTION>


                              FINANCIAL HIGHLIGHTS
                              TAX-FREE MONEY MARKET

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

                                                1996(1)      1996       1995       1994       1993       1992

PER-SHARE DATA
Net Asset Value,
<S>                                              <C>        <C>        <C>         <C>        <C>        <C>  
Beginning of Period ..........................   $1.00      $1.00      $1.00       $1.00      $1.00      $1.00
Income From Investment Operations
  Net Investment Income ......................     .01        .03        .03         .02        .02        .03
                                                   ---        ---        ---         ---        ---        ---
Distributions
  Fom Net Investment Income ..................    (.01)      (.03)      (.03)       (.02)      (.02)      (.03)
                                                  ----       ----       ----        ----       ----       ---- 
Net Asset Value, End of Period ...............   $1.00      $1.00      $1.00       $1.00      $1.00      $1.00
                                                 =====      =====      =====       =====      =====      =====
  Total Return(2) ............................    1.45%      3.19%      2.95%       1.92%      2.12%      3.48%


 RATIOS/SUPPLEMENTAL DATA
  Ratio of Operating Expenses to
  Average Net Assets(3) ......................  .68%(4)       .65%       .66%       .67%       .68%        .57%
  Ratio of Net Investment Income
  to Average Net Assets(3) ................... 2.87%(4)      3.12%      2.88%      1.89%      2.10%       3.40%
  Net Assets, End of Period (in thousands) ...  $91,122    $91,118    $92,034   $109,818   $109,875    $111,112


(1)  Six months ended November 30, 1996.

(2)  Total return assumes  reinvestment of dividends.  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

Semiannual Report                                      Financial Highlights   31

<TABLE>
<CAPTION>

                              FINANCIAL HIGHLIGHTS
                           INTERMEDIATE-TERM TAX-FREE

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

                                                1996(1)      1996       1995       1994       1993       1992


 PER-SHARE DATA
Net Asset Value,
<S>                                             <C>        <C>        <C>         <C>        <C>        <C>   
Beginning of Period .........................   $10.66     $10.71     $10.60      $10.90     $10.48     $10.33
Income from Investment Operations
  Net Investment Income .....................      .26        .52        .50         .51        .52        .56
  Net Realized and Unrealized Gain (Loss)
  on Investments ............................      .25       (.05)       .15        (.19)       .53        .27
                                                   ---       ----        ---        ----        ---        ---
  Total From
  Investment Operations .....................      .51        .47        .65         .32       1.05        .83
                                                   ---        ---        ---         ---       ----        ---
Distributions
  Fom Net Investment Income .................     (.26)      (.52)      (.50)       (.51)      (.52)      (.56)
  From Net Realized Gains
  on Investment Transactions ................       --         --       (.04)       (.11)      (.11)      (.12)
                                                  -----      -----      ----        ----       ----       ---- 
  Total Distributions .......................     (.26)      (.52)      (.54)       (.62)      (.63)      (.68)
                                                  ----       ----       ----        ----       ----       ---- 
Net Asset Value, End of Period ..............   $10.91     $10.66     $10.71      $10.60     $10.90     $10.48
                                                ======     ======     ======      ======     ======     ======
  Total Return(2) ...........................     4.86%      4.38%      6.40%       2.93%     10.26%      8.28%


 RATIOS/SUPPLEMENTAL DATA
  Ratio of Operating Expenses to
  Average Net Assets(3) .....................   .67%(4)       .70%       .66%       .67%       .72%        .65%
  Ratio of Net Investment Income
  to Average Net Assets(3) ..................  4.87%(4)      4.73%      4.82%      4.61%      4.81%       5.38%
  Portfolio Turnover Rate ...................    11.25%     45.98%     47.48%     46.11%     36.31%      84.96%
  Net Assets, End of Period (in thousands) ..   $64,632    $62,900    $64,904    $70,925    $67,550     $44,315

(1)  Six months ended November 30, 1996.
(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

32   Financial Highlights                         American Century Investments

<TABLE>
<CAPTION>

                              FINANCIAL HIGHLIGHTS
                               LONG-TERM TAX-FREE

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

                                                1996(1)      1996       1995       1994       1993       1992


 PER-SHARE DATA
Net Asset Value,
<S>                                             <C>        <C>        <C>         <C>        <C>        <C>   
Beginning of Period ........................... $11.29     $11.47     $11.26      $11.92     $11.26     $11.05
Income From Investment Operations
  Net Investment Income .......................    .30        .61        .62         .62        .63        .67
  Net Realized and Unrealized Gain (Loss)
  on Investments ..............................    .43       (.18)       .27        (.42)       .92        .43
                                                   ---       ----        ---        ----        ---        ---
  Total From
  Investment Operations .......................    .73        .43        .89         .20       1.55       1.10
                                                   ---        ---        ---         ---       ----       ----
Distributions
  From Net Investment Income ..................   (.30)      (.61)      (.62)       (.62)      (.63)      (.67)
  From Net Realized Gains on
  Investment Transactions .....................     --        --        (.06)       (.24)      (.26)      (.22)
                                                  -----      -----      ----        ----       ----       ---- 
  Total Distributions .........................   (.30)      (.61)      (.68)       (.86)      (.89)      (.89)
                                                  ----       ----       ----        ----       ----       ---- 
Net Asset Value, End of Period ................ $11.72     $11.29     $11.47      $11.26     $11.92     $11.26
                                                ======     ======     ======      ======     ======     ======
  Total Return(2) .............................   6.54%      3.75%      8.29%       1.54%     14.61%     10.42%


 RATIOS/SUPPLEMENTAL DATA
  Ratio of Operating Expenses to
  Average Net Assets(3) ....................... .68%(4)       .70%       .66%       .67%       .72%        .65%
  Ratio of Net Investment Income
  to Average Net Assets(3) ....................5.19%(4)      5.22%      5.59%      5.16%      5.40%       6.00%
  Portfolio Turnover Rate .....................  26.84%     49.17%     34.09%     39.37%    105.14%     148.26%
  Net Assets, End of
  Period (in thousands) ....................... $56,927    $51,382    $47,314    $57,330    $54,241     $42,146

(1)  Six months ended November 30, 1996.

(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

Semiannual Report                                      Financial Highlights   33

                                     NOTES

34   Notes                                        American Century Investments

                                     NOTES

Semiannual Report                                                Notes        35


                             BACKGROUND INFORMATION


INVESTMENT PHILOSOPHY & POLICIES

   American Century Investments offers 41 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 is a money  market fund that seeks as high a level of
interest  income exempt from regular  federal  income tax as is consistent  with
prudent investment management,  while seeking to conserve shareholders' capital.
There can be no  assurance  that the fund will be able to  maintain a stable net
asset value per share.

   Intermediate-Term  Tax-Free and  Long-Term  Tax-Free  seek as high a level of
interest  income exempt from regular  federal  income tax as is consistent  with
prudent investment management, while seeking to conserve shareholders' capital.

   An  investment  in the funds is neither  insured nor  guaranteed  by the U.S.
government.  There is no assurance that the funds will achieve their  respective
investment objectives.

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,  Inc. 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, Inc. 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 5 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
Vice President & Senior
Municipal Portfolio Manager             Dave MacEwen
Municipal Portfolio Managers            Bryan Karcher, Joel Silva
Municipal Credit Research Manager       Steven Permut
Credit Analysts                         Scott Lord, Bill McClintock

36   Background Information                       American Century Investments


                                    GLOSSARY

RETURNS

   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.

   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.

YIELDS

   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.

   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.

   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.

BOND PORTFOLIO STRUCTURES

   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.)

   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

   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%).

   Coupon--the stated interest rate of a security.

   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.
Most "normal"  yield curves start in the lower left corner of the graph and rise
to the upper right corner,  indicating that yields rise as maturities  lengthen.
This   upward   sloping   yield   curve   illustrates   a   normal   risk/return
relationship--more return (yield) for more risk (a longer maturity). Conversely,
a "flat" yield curve provides little or no extra return for taking on more risk.

STATISTICAL TERMINOLOGY

   Market Value--the market value of a fund's investments on a given date.

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

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

   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.  Therefore,  longer portfolio durations typically mean greater
sensitivity to changes in interest rates.

TYPES OF MUNICIPAL SECURITIES

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

   General Obligation (GO) Bonds--securities  backed by the taxing power of the 
issuer. 

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

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

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


Semiannual Report                                           Glossary          37

[american century logo]
American
Century(sm)

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

Person-to-Person Assistance:
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 816-753-1865

Fax: 816-340-7962

Internet: www.americancentury.com



American Century Municipal Trust

Investment Manager
Benham Management Corporation
Mountain View, California

This report and the financial  statements contained herein 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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