MERRILL LYNCH PENNSYLVANIA MUNICIPAL BOND FUND
N-30D, 2000-09-07
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                                  MERRILL LYNCH
                                  PENNSYLVANIA
                                  MUNICIPAL
                                  BOND FUND

                               [GRAPHIC OMITTED]

                         STRATEGIC
                                  Performance

                                  Annual Report
                                  July 31, 2000
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

TO OUR SHAREHOLDERS

The Municipal Market Environment

During the six months ended July 31, 2000, US domestic economic growth remained
robust. After growing at a 4.2% annual rate in 1999, US domestic economic growth
expanded at a 4.8% rate during the first quarter of 2000 and at a 5.2% rate
during the second quarter. However, despite these significant growth rates, few
price measure indicators have shown any meaningful signs of future price
pressures at the consumer level, despite the lowest unemployment rates since
1970. With few signs of any economic slowdown, the Federal Reserve Board
continued to raise short-term interest rates in February, March and May 2000.
The Federal Reserve Board cited both the continued growth of US employment and
the continued strength of US equity markets as reasons for attempting to
moderate US economic growth before inflationary price pressures can occur.

However, since then fixed-income markets have largely ignored strong economic
fundamentals and concentrated upon very positive technical supply factors.
Declining bond issuance--both current, and more importantly, expected future
issuance--helped push bond yields lower into mid-April 2000. In late January and
early February 2000, the US Treasury announced its intention to reduce the
amounts to be auctioned in the quarterly Treasury note and bond auctions.
Furthermore, budgetary surpluses allowed the US Treasury to repurchase
outstanding, higher-couponed Treasury issues, primarily in the 15-year and
longer maturity sector. Both these actions resulted in significant reduction in
the outstanding supply of longer-dated maturity US Treasury debt. Domestic and
international investors quickly began to accumulate what was expected to become
a scarce commodity and bond prices quickly rose.

By mid-April 2000, US Treasury bond yields had declined more than 80 basis
points (0.80%) to 5.67%. During the remainder of the period, US Treasury bond
prices were volatile as strong economic reports and investors' concerns of
additional moves by the Federal Reserve Board occasionally overshadowed the
positive technical position of the long-term US Treasury bond market.

Recently, a number of economic indicators have begun to suggest that the actions
taken by the Federal Reserve Board in 1999 and early 2000 have started to affect
US economic growth. Both new home sales and consumer spending have slowed,
suggesting that economic growth may subside into a 4%-4.5% range by late 2000.
In our opinion, this range of growth was targeted by the Federal Reserve Board
as being sustainable, given current productivity measures, without endangering
the present benign inflationary environment.

By June, investor focus returned to the dwindling supply of long-term US
Treasury securities and bond prices generally rose for the remainder of the
period. The decline in long-term US Treasury bond yields resulted in an inverted
yield curve as short-term and intermediate-term interest rates did not fall
proportionately to long-term interest rates as the Federal Reserve Board was
expected to continue to raise short-term interest rates. The current inversion
has had as much to do with debt reduction and US Treasury buybacks as with
investor expectations of slower economic growth. During the last six months, US
Treasury bond yields have declined more than 70 basis points to end the period
at 5.78%, their lowest monthly closing level since May 1999.

Tax-exempt bond yields also have declined in recent months. The decline has
largely been in response to the rally in US Treasury securities, as well as a
continued positive technical supply environment. States such as California and
Maryland have announced that their large current and anticipated future budget
surpluses will permit the cancellation or postponement of expected bond
issuance. Additionally, some issuers have also initiated tenders to repurchase
existing debt, reducing the supply of tax-exempt bonds in the secondary market
as well. Given the decline in available long-term US Treasury securities, some
investors who need longer maturity investment vehicles have begun to consider
long-term municipal bonds as potential substitutes. This has further
strengthened the overall positive technical position of the tax-exempt market.
During the last six months, long-term municipal revenue bond yields have
declined nearly 50 basis points to 5.85%, their lowest level since late August
1999, as measured by the Bond Buyer Revenue Bond Index.

The recent relative underperformance of the municipal bond market in recent
months has been especially disappointing given the strong technical


1
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

position the tax-exempt bond market has enjoyed. The issuance of long-term
tax-exempt securities has dramatically declined. During the last year, almost
$200 billion in new long-term municipal securities was issued, a decline of
almost 20% compared to the same period a year earlier. For the six months ended
July 31, 2000, approximately $100 billion in new tax-exempt bonds was
underwritten, a decline of 17% compared to the same period in 1999.

Although investors received more than $45 billion in coupon payments, bond
maturities and the proceeds from early bond redemptions during June and July,
overall investor demand has diminished. Long-term municipal bond mutual funds
have seen consistent outflows in recent months as the yields of individual
securities have risen faster than those of larger, more diverse mutual funds.
Thus far this year, tax-exempt mutual funds have had net redemptions of more
than $12 billion.

However, the rate at which these redemptions have been occurring has slowed in
recent months. Recent US equity market volatility, especially in the NASDAQ, has
reduced some investor interest in the stock market. This investor interest,
especially earlier this year, had been siphoning away demand for municipal bonds
by retail investors. Also, the demand from property and casualty companies is
expected to increase in the coming months. These firms are becoming more
profitable after experiencing losses in the past few years resulting from a
series of weather-related natural disasters. Yet as positive as the tax-exempt
bond market's technical environment has been for much of this year, investor
response to the reduction in both current and future supply of US Treasury bonds
has been overwhelmingly positive and municipal bond yields have underperformed
their taxable counterparts.

Significantly lower municipal bond yields are still likely to require weaker US
employment growth and consumer spending. The actions taken in recent months by
the Federal Reserve Board should eventually slow US economic growth. Recent
declines in US new home sales are perhaps the first sign that consumer spending
is being slowed by higher interest rates. Until further signs develop, it is
likely that the municipal bond market's current favorable technical position
will dampen significant tax-exempt interest rate volatility and provide a stable
environment for eventual improvement in municipal bond prices.

Portfolio Strategy

During the period ended January 31, 2000, we gradually adopted a more neutral
portfolio structure and we continued this strategy into the six-month period
ended July 31, 2000. More interest rate-sensitive issues have been sold and
replaced with higher-couponed issues in the 15-year-20-year maturity range.
Given the steepness of the tax-exempt yield curve, bonds in this maturity range
are able to capture approximately 95% of the yield available in the entire
municipal yield curve. Bonds with this structure are significantly less
sensitive to interest rate changes than bonds maturing in 25 years-30 years, yet
still allow us to maintain an attractive dividend stream. However, reduced new
bond issuance in recent months has hampered our efforts.

Credit quality has continued to be of primary concern. We purposely
underutilized the portion of assets that can be committed to lower-rated
securities. This helped performance in the recent period of widening credit
quality spreads. Looking forward, we expect to continue the process of
increasing average coupon structure and limiting duration in an effort to temper
the portfolio's volatility and exposure to long-term interest rate swings.

Fiscal Year in Review

For the 12 months ended July 31, 2000, we largely structured the Fund in
anticipation of a benign interest rate environment. This strategy was based on
the belief that inflationary pressures would remain negligible during the next
12 months. During that period, our view on inflation was correct, but interest
rates increased as the Federal Reserve Board raised short-term interest rates in
an effort to curtail domestic economic growth. This neutral strategy produced
above-average total returns of +2.44%, +1.92%, +1.82% and +2.25% for the Fund's
Class A, Class B, Class C and Class D Shares, respectively, for the year ended
July 31, 2000. This compares to the Lipper Analytical Services, Inc. average
total return of +1.62% for similar Pennsylvania Municipal tax-exempt funds
during the same 12-month period. (Investment results shown do not reflect sales
charges and would be lower if sales charges were


2
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

included. Complete performance information can be found on pages 4 and 5 of this
report to shareholders.)

In Conclusion

We appreciate your continuing interest in Merrill Lynch Pennsylvania Municipal
Bond Fund, and we look forward to assisting you with your financial needs in the
months and years ahead.

Sincerely,


/s/ Terry K. Glenn

Terry K. Glenn
President and Trustee


/s/ Vincent R. Giordano

Vincent R. Giordano
Senior Vice President


/s/ William R. Bock

William R. Bock
Vice President and Portfolio Manager

September 1, 2000


3
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

PERFORMANCE DATA

About Fund Performance

Investors are able to purchase shares of the Fund through the Merrill Lynch
Select Pricing(SM) System, which offers four pricing alternatives:

o     Class A Shares incur a maximum initial sales charge (front-end load) of 4%
      and bear no ongoing distribution or account maintenance fees. Class A
      Shares are available only to eligible investors.

o     Class B Shares are subject to a maximum contingent deferred sales charge
      of 4% if redeemed during the first year, decreasing 1% each year
      thereafter to 0% after the fourth year. In addition, Class B Shares are
      subject to a distribution fee of 0.25% and an account maintenance fee of
      0.25%. These shares automatically convert to Class D Shares after
      approximately 10 years. (There is no initial sales charge for automatic
      share conversions.)

o     Class C Shares are subject to a distribution fee of 0.35% and an account
      maintenance fee of 0.25%. In addition, Class C Shares are subject to a 1%
      contingent deferred sales charge if redeemed within one year of purchase.

o     Class D Shares incur a maximum initial sales charge of 4% and an account
      maintenance fee of 0.10% (but no distribution fee).

None of the past results shown should be considered a representation of future
performance. Figures shown in the "Recent Performance Results" and "Average
Annual Total Return" tables assume reinvestment of all dividends and capital
gains distributions at net asset value on the payable date. Investment return
and principal value of shares will fluctuate so that shares, when redeemed, may
be worth more or less than their original cost. Dividends paid to each class of
shares will vary because of the different levels of account maintenance,
distribution and transfer agency fees applicable to each class, which are
deducted from the income available to be paid to shareholders.

Average Annual Total Return

                                        % Return Without        % Return With
                                          Sales Charge          Sales Charge**
================================================================================
Class A Shares*
================================================================================
One Year Ended 6/30/00                       +1.11%                 -2.94%
--------------------------------------------------------------------------------
Five Years Ended 6/30/00                     +4.96                  +4.11
--------------------------------------------------------------------------------
Inception (8/31/90)
through 6/30/00                              +6.71                  +6.27
--------------------------------------------------------------------------------
 * Maximum sales charge is 4%.
** Assuming maximum sales charge.

                                           % Return                % Return
                                          Without CDSC            With CDSC**
================================================================================
Class B Shares*
================================================================================
One Year Ended 6/30/00                       +0.59%                 -3.23%
--------------------------------------------------------------------------------
Five Years Ended 6/30/00                     +4.43                  +4.43
--------------------------------------------------------------------------------
Inception (8/31/90)
through 6/30/00                              +6.18                  +6.18
--------------------------------------------------------------------------------
 * Maximum contingent deferred sales charge is 4% and is reduced to 0% after 4
   years.
** Assuming payment of applicable contingent deferred sales charge.

================================================================================
                                           % Return                % Return
                                          Without CDSC            With CDSC**
================================================================================
Class C Shares*
================================================================================
One Year Ended 6/30/00                       +0.49%                 -0.46%
--------------------------------------------------------------------------------
Five Years Ended 6/30/00                     +4.32                  +4.32
--------------------------------------------------------------------------------
Inception (10/21/94)
through 6/30/00                              +5.12                  +5.12
--------------------------------------------------------------------------------
 * Maximum contingent deferred sales charge is 1% and is reduced to 0% after 1
   year.
** Assuming payment of applicable contingent deferred sales charge.

================================================================================
                                        % Return Without        % Return With
                                          Sales Charge          Sales Charge**
================================================================================
Class D Shares*
================================================================================
One Year Ended 6/30/00                       +1.01%                 -3.03%
--------------------------------------------------------------------------------
Five Years Ended 6/30/00                     +4.86                  +4.00
--------------------------------------------------------------------------------
Inception (10/21/94)
through 6/30/00                              +5.67                  +4.92
--------------------------------------------------------------------------------
 * Maximum sales charge is 4%.
** Assuming maximum sales charge.


4
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

PERFORMANCE DATA (concluded)

ML Pennsylvania Municipal Bond Fund's Class A and Class B Shares--
Total Return Based on a $10,000 Investment

A line graph depicting the growth of an investment in the Portfolio's Class A
Shares and Class B Shares compared to growth of an investment in the Lehman
Brothers Municipal Bond Index. Beginning and ending values are:

                                          8/31/90**          7/00
ML Pennsylvania
Municipal Bond Fund+--
Class A Shares*                           $ 9,600           $18,436
ML Pennsylvania
Municipal Bond Fund+--
Class B Shares*                           $10,000           $18,266
Lehman Brothers Municipal
Bond Index++                              $10,000           $20,067

ML Pennsylvania Municipal Bond Fund's Class C and Class D Shares--
Total Return Based on a $10,000 Investment

A line graph depicting the growth of an investment in the Portfolio's Class C
and Class D Shares compared to growth of an investment in the Lehman Brothers
Municipal Bond Index. Beginning and ending values are:

                                          10/21/94**         7/00
ML Pennsylvania
Municipal Bond Fund+--
Class C Shares*                           $10,000           $13,462
ML Pennsylvania
Municipal Bond Fund+--
Class D Shares*                           $ 9,600           $13,321
Lehman Brothers Municipal
Bond Index++                              $10,000           $14,849

*     Assuming maximum sales charge, transaction costs and other operating
      expenses, including advisory fees.
**    Commencement of operations.
+     ML Pennsylvania Municipal Bond Fund invests primarily in long-term
      investment-grade obligations issued by or on behalf of the Commonwealth of
      Pennsylvania, its political subdivisions, agencies and instrumentalities
      and obligations of other qualifying issuers.
++    This unmanaged Index consists of long-term revenue bonds, prerefunded
      bonds, general obligation bonds and insured bonds. The starting date for
      the Index in the Class C & Class D Shares' graph is from 10/31/94.
Past performance is not predictive of future performance.

Recent Performance Results*

<TABLE>
<CAPTION>
                                                                     6 Month        12 Month      Since Inception       Standardized
As of July 31, 2000                                               Total Return    Total Return     Total Return         30-Day Yield
====================================================================================================================================
<S>                                                                   <C>             <C>             <C>                  <C>
ML Pennsylvania Municipal Bond Fund Class A Shares                    +6.39%          +2.44%          +92.07%              4.84%
------------------------------------------------------------------------------------------------------------------------------------
ML Pennsylvania Municipal Bond Fund Class B Shares                    +6.12           +1.92           +82.66               4.54
------------------------------------------------------------------------------------------------------------------------------------
ML Pennsylvania Municipal Bond Fund Class C Shares                    +6.07           +1.82           +34.62               4.43
------------------------------------------------------------------------------------------------------------------------------------
ML Pennsylvania Municipal Bond Fund Class D Shares                    +6.33           +2.25           +38.77               4.74
====================================================================================================================================
</TABLE>

*     Investment results shown do not reflect sales charges; results would be
      lower if a sales charge was included. Total investment returns are based
      on changes in net asset values for the periods shown, and assume
      reinvestment of all dividends and capital gains distributions at net asset
      value on the payable date. The Fund's since inception periods are from
      8/31/90 for Class A & Class B Shares and from 10/21/94 for Class C & Class
      D Shares.


5
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

SCHEDULE OF INVESTMENTS                                           (in Thousands)

<TABLE>
<CAPTION>
S&P       Moody's     Face
Ratings   Ratings    Amount                                           Issue                                                  Value
-----------------------------------------------------------------------------------------------------------------------------------
Pennsylvania--101.0%
-----------------------------------------------------------------------------------------------------------------------------------
<C>       <C>        <C>       <S>                                                                                          <C>
NR*       A2         $2,000    Allegheny County, Pennsylvania, Hospital Development Authority Revenue Bonds
                               (South Hills Health System), Series A, 6.50% due 5/01/2014                                   $ 2,018
-----------------------------------------------------------------------------------------------------------------------------------
                               Allegheny County, Pennsylvania, IDA, Revenue Refunding Bonds:
AAA       Aaa         4,785      (Commercial Development--MPB Associates Project), 7.70% due 12/01/2013 (d)                   5,748
BBB       Baa1        2,000      (Environmental Improvement--USX Corporation Project), 6.10% due 7/15/2020                    1,909
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         3,000    Allegheny County, Pennsylvania, Port Authority, Special Transportation Revenue Bonds,
                               6% due 3/01/2024 (b)                                                                           3,092
-----------------------------------------------------------------------------------------------------------------------------------
NR*       NR*         1,000    Allegheny County, Pennsylvania, Redevelopment Authority, Tax Increment Revenue Bonds
                               (Waterfront Project), Series A, 6.30% due 12/15/2018                                           1,021
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         3,700    Allegheny County, Pennsylvania, Sanitation Authority, Sewer Revenue Bonds,
                               5.375% due 12/01/2024 (b)                                                                      3,566
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         3,550    Cambria County, Pennsylvania, GO, Refunding, Series A, 6.625% due 8/15/2014 (c)                3,847
-----------------------------------------------------------------------------------------------------------------------------------
NR*       Aaa         2,200    Downingtown, Pennsylvania, Area School District, GO, Refunding, 5.70% due 3/01/2021 (a)        2,213
-----------------------------------------------------------------------------------------------------------------------------------
NR*       NR*           920    Erie, Western Pennsylvania Port Authority Revenue Bonds, 6.875% due 6/15/2016                    932
-----------------------------------------------------------------------------------------------------------------------------------
A1+       VMIG1@      3,800    Geisinger Authority, Pennsylvania, Health System Revenue Refunding Bonds
                               (Penn State--Geisinger Health), VRDN, Series B, 4.35% due 8/15/2028 (g)                        3,800
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         3,000    Lehigh County, Pennsylvania, General Purpose Authority Revenue Bonds (Saint Luke's
                               Hospital--Bethlehem), 6.25% due 7/01/2022 (a)                                                  3,057
-----------------------------------------------------------------------------------------------------------------------------------
                               Luzerne County, Pennsylvania, IDA, Exempt Facilities Revenue Refunding Bonds
                               (Pennsylvania Gas and Water Company Project), AMT, Series A:
A         A3          3,600      7.20% due 10/01/2017                                                                         3,808
AAA       Aaa         2,000      7% due 12/01/2017 (a)                                                                        2,173
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         2,500    Montgomery County, Pennsylvania, Higher Education and Health Authority, Hospital Revenue
                               Bonds (Abington Hospital), MVRICS, Series A, 8.745% due 6/12/2001 (a)(f)(h)                    2,681
-----------------------------------------------------------------------------------------------------------------------------------
                               Pennsylvania Convention Center Authority, Revenue Refunding Bonds, Series A:
BBB       Baa2        1,555      6.70% due 9/01/2014                                                                          1,618
BBB       Baa2        2,500      6.75% due 9/01/2019                                                                          2,581
-----------------------------------------------------------------------------------------------------------------------------------
BBB       Baa2        4,000    Pennsylvania Economic Development Financing Authority, Wastewater Treatment Revenue
                               Bonds (Sun Company Inc.--R & M Project), AMT, Series A, 7.60% due 12/01/2024                   4,189
-----------------------------------------------------------------------------------------------------------------------------------
AA+       Aa2         2,000    Pennsylvania HFA, Revenue Bonds, RIB, AMT, 7.614% due 4/01/2025 (f)                            2,010
-----------------------------------------------------------------------------------------------------------------------------------
AA+       Aa2         1,000    Pennsylvania HFA, Revenue Refunding Bonds, RIB, AMT, 9.356% due 10/01/2023 (f)                 1,065
-----------------------------------------------------------------------------------------------------------------------------------
AA+       Aa2         2,165    Pennsylvania HFA, S/F Mortgage Revenue Bonds, AMT, Series 40, 6.90% due 4/01/2025              2,266
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

PORTFOLIO ABBREVIATIONS

To simplify the listings of Merrill Lynch Pennsylvania Municipal Bond Fund's
portfolio holdings in the Schedule of Investments, we have abbreviated the names
of many of the securities according to the list below and at right.

AMT     Alternative Minimum Tax (subject to)
GO      General Obligation Bonds
HFA     Housing Finance Agency
IDA     Industrial Development Authority
IDR     Industrial Development Revenue Bonds
MVRICS  Municipal Variable Rate Inverse Class Securities
RIB     Residual Interest Bonds
S/F     Single-Family
VRDN    Variable Rate Demand Notes


6
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

SCHEDULE OF INVESTMENTS (concluded)                               (in Thousands)

<TABLE>
<CAPTION>
S&P       Moody's     Face
Ratings   Ratings    Amount                                           Issue                                                  Value
-----------------------------------------------------------------------------------------------------------------------------------
Pennsylvania (concluded)
-----------------------------------------------------------------------------------------------------------------------------------
<C>       <C>        <C>       <S>                                                                                          <C>
                               Pennsylvania HFA, S/F Mortgage Revenue Refunding Bonds, AMT:
AA+       Aa2        $1,485      Series 41B, 6.65% due 4/01/2025                                                            $ 1,521
AA+       Aa2         1,250      Series 59A, 5.80% due 10/01/2029                                                             1,202
AA+       Aa2         1,865      Series 60A, 5.85% due 10/01/2027                                                             1,787
AA+       Aa2         1,000      Series 62A, 5.50% due 10/01/2022                                                               941
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         3,100    Pennsylvania Intergovernmental Co-Op Authority, Special Tax Revenue Refunding Bonds
                               (Philadelphia Funding Program), 5% due 6/15/2021 (c)                                           2,844
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         4,000    Pennsylvania State, GO, Refunding, First Series, 6% due 1/15/2017 (b)                          4,191
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         6,000    Pennsylvania State, GO, Second Series, 5.75% due 10/01/2019 (b)                                6,088
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         2,750    Pennsylvania State Higher Education Assistance Agency Revenue Bonds,
                               6.125% due 12/15/2020 (b)                                                                      2,878
-----------------------------------------------------------------------------------------------------------------------------------
BBB+      NR*         2,000    Pennsylvania State Higher Educational Facilities Authority, College and University Revenue
                               Refunding Bonds (Ursinus College), 5.90% due 1/01/2027                                         1,882
-----------------------------------------------------------------------------------------------------------------------------------
                               Pennsylvania State Higher Educational Facilities Authority, Revenue Refunding Bonds:
A1+       NR*           300      (Carnegie Mellon University), VRDN, Series D, 4.35% due 11/01/2030 (g)                         300
AAA       NR*           600      Series A, 6.625% due 8/15/2009 (b)                                                             633
-----------------------------------------------------------------------------------------------------------------------------------
NR*       Baa2        1,300    Philadelphia, Pennsylvania, Authority for IDR, Refunding (Franklin Institute Project),
                               5.20% due 6/15/2026                                                                            1,093
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         1,000    Philadelphia, Pennsylvania, Authority for Industrial Development, Airport Revenue Bonds
                               (Philadelphia Airport System Project), AMT, Series A, 5.125% due 7/01/2028 (c)                   888
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         1,440    Philadelphia, Pennsylvania, Gas Works Revenue Bonds, 12th Series B,
                               7% due 5/15/2020 (b)(e)                                                                        1,658
-----------------------------------------------------------------------------------------------------------------------------------
AAA       NR*         3,000    Philadelphia, Pennsylvania, Hospitals and Higher Education Facilities Authority, Hospital
                               Revenue Refunding Bonds (Presbyterian Medical Center), 6.65% due 12/01/2019 (e)                3,373
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         1,200    Philadelphia, Pennsylvania, Parking Authority, Airport Parking Revenue Bonds,
                               5.25% due 9/01/2022 (d)                                                                        1,134
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         3,000    Philadelphia, Pennsylvania, Parking Authority, Parking Revenue Bonds, Series A,
                               5.125% due 2/15/2024 (a)                                                                       2,771
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         5,000    Philadelphia, Pennsylvania, Parking Authority, Parking Revenue Refunding Bonds,
                               5% due 2/01/2027 (a)                                                                           4,480
-----------------------------------------------------------------------------------------------------------------------------------
A-        NR*         1,750    Scranton-Lackawanna, Pennsylvania, Health and Welfare Authority, Revenue Refunding
                               Bonds (University of Scranton Project), Series A, 6.50% due 3/01/2013                          1,821
-----------------------------------------------------------------------------------------------------------------------------------
AAA       Aaa         1,500    Washington County, Pennsylvania, Capital Funding Authority Revenue Bonds (Capital
                               Projects and Equipment Program), 6.15% due 12/01/2029 (a)                                      1,602
-----------------------------------------------------------------------------------------------------------------------------------
Total Investments (Cost--$93,450)--101.0%                                                                                    96,681
Liabilities in Excess of Other Assets--(1.0%)                                                                                  (917)
                                                                                                                            -------
Net Assets--100.0%                                                                                                          $95,764
                                                                                                                            =======
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(a)   AMBAC Insured.
(b)   MBIA Insured.
(c)   FGIC Insured.
(d)   FSA Insured.
(e)   Escrowed to maturity.
(f)   The interest rate is subject to change periodically and inversely based
      upon prevailing market rates. The interest rate shown is the rate in
      effect at July 31, 2000.
(g)   The interest rate is subject to change periodically based upon prevailing
      market rates. The interest rate shown is the rate in effect at July 31,
      2000.
(h)   Prerefunded.
*     Not Rated.
@     Highest short-term rating by Moody's Investors Service, Inc.

Ratings of issues shown have not been audited by Deloitte & Touche LLP.

See Notes to Financial Statements.


7
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

FINANCIAL INFORMATION

Statement of Assets and Liabilities as of July 31, 2000

<TABLE>
<C>                    <S>                                                                             <C>             <C>
Assets:                Investments, at value (identified cost--$93,449,504) .........................                  $ 96,680,738
                       Cash .........................................................................                        74,988
                       Receivables:
                         Interest ...................................................................  $  1,414,265
                         Beneficial interest sold ...................................................       176,635       1,590,900
                                                                                                       ------------
                       Prepaid registration fees and other assets ...................................                        10,062
                                                                                                                       ------------
                       Total assets .................................................................                    98,356,688
                                                                                                                       ------------
-----------------------------------------------------------------------------------------------------------------------------------
Liabilities:           Payables:
                         Securities purchased .......................................................     2,200,000
                         Beneficial interest redeemed ...............................................       119,669
                         Dividends to shareholders ..................................................        88,007
                         Investment adviser .........................................................        42,135
                         Distributor ................................................................        30,928       2,480,739
                                                                                                       ------------
                       Accrued expenses and other liabilities .......................................                       111,531
                                                                                                                       ------------
                       Total liabilities ............................................................                     2,592,270
                                                                                                                       ------------
-----------------------------------------------------------------------------------------------------------------------------------
Net Assets:            Net assets ...................................................................                  $ 95,764,418
                                                                                                                       ============
-----------------------------------------------------------------------------------------------------------------------------------
Net Assets             Class A Shares of beneficial interest, $.10 par value, unlimited number of
Consist of:            shares authorized ............................................................                  $    137,523
                       Class B Shares of beneficial interest, $.10 par value, unlimited number of
                       shares authorized ............................................................                       652,087
                       Class C Shares of beneficial interest, $.10 par value, unlimited number of
                       shares authorized ............................................................                        55,736
                       Class D Shares of beneficial interest, $.10 par value, unlimited number of
                       shares authorized ............................................................                        63,251
                       Paid-in capital in excess of par .............................................                    97,364,442
                       Accumulated realized capital losses on investments--net ......................                    (4,052,327)
                       Accumulated distributions in excess of realized capital gains on
                       investments--net .............................................................                    (1,687,528)
                       Unrealized appreciation on investments--net ..................................                     3,231,234
                                                                                                                       ------------
                       Net assets ...................................................................                  $ 95,764,418
                                                                                                                       ============
-----------------------------------------------------------------------------------------------------------------------------------
Net Asset Value:       Class A--Based on net assets of $14,493,554 and 1,375,225 shares
                       of beneficial interest outstanding ...........................................                  $      10.54
                                                                                                                       ============
                       Class B--Based on net assets of $68,722,883 and 6,520,865 shares
                       of beneficial interest outstanding ...........................................                  $      10.54
                                                                                                                       ============
                       Class C--Based on net assets of $5,874,506 and 557,358 shares
                       of beneficial interest outstanding ...........................................                  $      10.54
                                                                                                                       ============
                       Class D--Based on net assets of $6,673,475 and 632,509 shares
                       of beneficial interest outstanding ...........................................                  $      10.55
                                                                                                                       ============
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

See Notes to Financial Statements.


8
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

FINANCIAL INFORMATION (continued)

Statement of Operations

<TABLE>
<CAPTION>
                                                                                                                 For the Year Ended
                                                                                                                      July 31, 2000
-----------------------------------------------------------------------------------------------------------------------------------
<C>                    <S>                                                                             <C>             <C>
Investment Income:     Interest and amortization of premium and discount earned ....................                   $  6,498,276
-----------------------------------------------------------------------------------------------------------------------------------
Expenses:              Investment advisory fees ....................................................   $    593,047
                       Account maintenance and distribution fees--Class B ..........................        388,564
                       Accounting services .........................................................         83,827
                       Professional fees ...........................................................         73,288
                       Printing and shareholder reports ............................................         49,066
                       Transfer agent fees--Class B ................................................         39,976
                       Account maintenance and distribution fees--Class C ..........................         37,588
                       Trustees' fees and expenses .................................................          8,992
                       Custodian fees ..............................................................          8,673
                       Account maintenance fees--Class D ...........................................          7,586
                       Transfer agent fees--Class A ................................................          6,909
                       Pricing fees ................................................................          5,478
                       Transfer agent fees--Class C ................................................          3,286
                       Transfer agent fees--Class D ................................................          3,194
                       Registration fees ...........................................................          2,925
                       Other .......................................................................          4,486
                                                                                                       ------------
                       Total expenses ..............................................................                      1,316,885
                                                                                                                       ------------
                       Investment income--net ......................................................                      5,181,391
                                                                                                                       ------------
-----------------------------------------------------------------------------------------------------------------------------------
Realized &             Realized loss on investments--net ...........................................                     (4,052,327)
Unrealized             Change in unrealized appreciation on investments--net .......................                        (39,119)
Loss on                                                                                                                 -----------
Investments--Net:      Net Increase in Net Assets Resulting from Operations ........................                    $ 1,089,945
                                                                                                                        ===========
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

See Notes to Financial Statements.


9
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

FINANCIAL INFORMATION (continued)

Statements of Changes in Net Assets

<TABLE>
<CAPTION>
                                                                                                               For the Year
                                                                                                              Ended July 31,
                                                                                                       ----------------------------
Increase (Decrease) in Net Assets:                                                                          2000            1999
-----------------------------------------------------------------------------------------------------------------------------------
<C>                    <S>                                                                             <C>             <C>
Operations:            Investment income--net .......................................................  $  5,181,391    $  6,128,073
                       Realized gain (loss) on investments--net .....................................    (4,052,327)      1,616,946
                       Change in unrealized appreciation on investments--net ........................       (39,119)     (6,270,761)
                                                                                                       ------------    ------------
                       Net increase in net assets resulting from operations .........................     1,089,945       1,474,258
                                                                                                       ------------    ------------
-----------------------------------------------------------------------------------------------------------------------------------
Dividends &            Investment income--net:
Distributions to         Class A ....................................................................      (848,092)       (993,621)
Shareholders:            Class B ....................................................................    (3,657,278)     (4,386,477)
                         Class C ....................................................................      (288,665)       (297,989)
                         Class D ....................................................................      (387,356)       (449,986)
                       Realized gain on investments--net:
                         Class A ....................................................................            --        (289,120)
                         Class B ....................................................................            --      (1,456,487)
                         Class C ....................................................................            --         (98,612)
                         Class D ....................................................................            --        (136,597)
                       In excess of realized gain on investments--net:
                         Class A ....................................................................       (92,497)       (157,103)
                         Class B ....................................................................      (442,944)       (791,431)
                         Class C ....................................................................       (35,079)        (53,585)
                         Class D ....................................................................       (40,665)        (74,224)
                                                                                                       ------------    ------------
                       Net decrease in net assets resulting from dividends and distributions
                       to shareholders ..............................................................    (5,792,576)     (9,185,232)
                                                                                                       ------------    ------------
-----------------------------------------------------------------------------------------------------------------------------------
Beneficial Interest    Net decrease in net assets derived from beneficial interest transactions .....   (29,220,983)     (1,545,558)
Transactions:                                                                                          ------------    ------------
-----------------------------------------------------------------------------------------------------------------------------------
Net Assets:            Total decrease in net assets .................................................   (33,923,614)     (9,256,532)
                       Beginning of year ............................................................   129,688,032     138,944,564
                                                                                                       ------------    ------------
                       End of year ..................................................................  $ 95,764,418    $129,688,032
                                                                                                       ============    ============
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

See Notes to Financial Statements.


10
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

FINANCIAL INFORMATION (continued)

Financial Highlights

<TABLE>
<CAPTION>
                                                                                                     Class A
The following per share data and ratios have been derived                  --------------------------------------------------------
from information provided in the financial statements.                                     For the Year Ended July 31,
                                                                           --------------------------------------------------------
Increase (Decrease) in Net Asset Value:                                       2000        1999        1998        1997        1996
-----------------------------------------------------------------------------------------------------------------------------------
<C>                     <S>                                                <C>         <C>         <C>         <C>         <C>
Per Share               Net asset value, beginning of year ..............  $  10.90    $  11.52    $  11.59    $  11.17    $  11.07
Operating                                                                  --------    --------    --------    --------    --------
Performance:            Investment income--net ..........................       .54         .54         .59         .60         .61
                        Realized and unrealized gain (loss) on
                        investments--net ................................      (.30)       (.38)        .08         .45         .10
                                                                           --------    --------    --------    --------    --------
                        Total from investment operations ................       .24         .16         .67        1.05         .71
                                                                           --------    --------    --------    --------    --------
                        Less dividends and distributions:
                          Investment income--net ........................      (.54)       (.54)       (.59)       (.60)       (.61)
                          Realized gain on investments--net .............        --        (.16)       (.15)       (.03)         --
                          In excess of realized gain on
                          investments--net ..............................      (.06)       (.08)         --          --          --
                                                                           --------    --------    --------    --------    --------
                        Total dividends and distributions ...............      (.60)       (.78)       (.74)       (.63)       (.61)
                                                                           --------    --------    --------    --------    --------
                        Net asset value, end of year ....................  $  10.54    $  10.90    $  11.52    $  11.59    $  11.17
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Total Investment        Based on net asset value per share ..............     2.44%       1.38%       6.02%       9.72%       6.53%
Return:*                                                                   ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Ratios to Average       Expenses ........................................      .81%        .80%        .73%        .74%        .76%
Net Assets:                                                                ========    ========    ========    ========    ========
                        Investment income--net ..........................     5.20%       4.80%       5.12%       5.36%       5.41%
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Supplemental            Net assets, end of year (in thousands) ..........  $ 14,494    $ 19,536    $ 20,613    $ 21,179    $ 21,626
Data:                                                                      ========    ========    ========    ========    ========
                        Portfolio turnover ..............................    51.32%      43.18%      46.87%      49.82%      58.33%
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

* Total investment returns exclude the effects of sales charges.

  See Notes to Financial Statements.


11
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

FINANCIAL INFORMATION (continued)

Financial Highlights (continued)

<TABLE>
<CAPTION>
                                                                                                     Class B
The following per share data and ratios have been derived                  --------------------------------------------------------
from information provided in the financial statements.                                     For the Year Ended July 31,
                                                                           --------------------------------------------------------
Increase (Decrease) in Net Asset Value:                                       2000        1999        1998        1997        1996
-----------------------------------------------------------------------------------------------------------------------------------
<C>                     <S>                                                <C>         <C>         <C>         <C>         <C>
Per Share               Net asset value, beginning of year ..............  $  10.90    $  11.53    $  11.59    $  11.17    $  11.07
Operating                                                                  --------    --------    --------    --------    --------
Performance:            Investment income--net ..........................       .48         .49         .53         .55         .55
                        Realized and unrealized gain (loss) on
                        investments--net ................................      (.30)       (.39)        .09         .45         .10
                                                                           --------    --------    --------    --------    --------
                        Total from investment operations ................       .18         .10         .62        1.00         .65
                                                                           --------    --------    --------    --------    --------
                        Less dividends and distributions:
                          Investment income--net ........................      (.48)       (.49)       (.53)       (.55)       (.55)
                          Realized gain on investments--net .............        --        (.16)       (.15)       (.03)         --
                          In excess of realized gain on
                          investments--net ..............................      (.06)       (.08)         --          --          --
                                                                           --------    --------    --------    --------    --------
                        Total dividends and distributions ...............      (.54)       (.73)       (.68)       (.58)       (.55)
                                                                           --------    --------    --------    --------    --------
                        Net asset value, end of year ....................  $  10.54    $  10.90    $  11.53    $  11.59    $  11.17
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Total Investment        Based on net asset value per share ..............     1.92%        .78%       5.57%       9.17%       5.98%
Return:*                                                                   ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Ratios to Average       Expenses ........................................     1.32%       1.31%       1.24%       1.25%       1.27%
Net Assets:                                                                ========    ========    ========    ========    ========
                        Investment income--net ..........................     4.69%       4.29%       4.61%       4.85%       4.91%
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Supplemental            Net assets, end of year (in thousands) ..........  $ 68,723    $ 93,164    $103,261    $109,070    $120,565
Data:                                                                      ========    ========    ========    ========    ========
                        Portfolio turnover ..............................    51.32%      43.18%      46.87%      49.82%      58.33%
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

* Total investment returns exclude the effects of sales charges.

  See Notes to Financial Statements.


12
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

FINANCIAL INFORMATION (continued)

Financial Highlights (continued)

<TABLE>
<CAPTION>
                                                                                                     Class C
The following per share data and ratios have been derived                  --------------------------------------------------------
from information provided in the financial statements.                                     For the Year Ended July 31,
                                                                           --------------------------------------------------------
Increase (Decrease) in Net Asset Value:                                       2000        1999        1998        1997        1996
-----------------------------------------------------------------------------------------------------------------------------------
<C>                     <S>                                                <C>         <C>         <C>         <C>         <C>
Per Share               Net asset value, beginning of year ..............  $  10.90    $  11.53    $  11.59    $  11.17    $  11.07
Operating                                                                  --------    --------    --------    --------    --------
Performance:            Investment income--net ..........................       .47         .48         .52         .53         .54
                        Realized and unrealized gain (loss) on
                        investments--net ................................      (.30)       (.39)        .09         .45         .10
                                                                           --------    --------    --------    --------    --------
                        Total from investment operations ................       .17         .09         .61         .98         .64
                                                                           --------    --------    --------    --------    --------
                        Less dividends and distributions:
                          Investment income--net ........................      (.47)       (.48)       (.52)       (.53)       (.54)
                          Realized gain on investments--net .............        --        (.16)       (.15)       (.03)         --
                          In excess of realized gain on
                          investments--net ..............................      (.06)       (.08)         --          --          --
                                                                           --------    --------    --------    --------    --------
                        Total dividends and distributions ...............      (.53)       (.72)       (.67)       (.56)       (.54)
                                                                           --------    --------    --------    --------    --------
                        Net asset value, end of year ....................  $  10.54    $  10.90    $  11.53    $  11.59    $  11.17
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Total Investment        Based on net asset value per share ..............     1.82%        .68%       5.47%       9.06%       5.87%
Return:*                                                                   ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Ratios to Average       Expenses ........................................     1.42%       1.41%       1.34%       1.35%       1.37%
Net Assets:                                                                ========    ========    ========    ========    ========
                        Investment income--net ..........................     4.60%       4.19%       4.51%       4.75%       4.80%
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Supplemental            Net assets, end of year (in thousands) ..........  $  5,874    $  7,088    $  6,928    $  6,145    $  4,722
Data:                                                                      ========    ========    ========    ========    ========
                        Portfolio turnover ..............................    51.32%      43.18%      46.87%      49.82%      58.33%
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

* Total investment returns exclude the effects of sales charges.

  See Notes to Financial Statements.


13
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

FINANCIAL INFORMATION (concluded)

Financial Highlights (concluded)

<TABLE>
<CAPTION>
                                                                                                     Class D
The following per share data and ratios have been derived                  --------------------------------------------------------
from information provided in the financial statements.                                     For the Year Ended July 31,
                                                                           --------------------------------------------------------
Increase (Decrease) in Net Asset Value:                                       2000        1999        1998        1997        1996
-----------------------------------------------------------------------------------------------------------------------------------
<C>                     <S>                                                <C>         <C>         <C>         <C>         <C>
Per Share               Net asset value, beginning of year ..............  $  10.92    $  11.54    $  11.60    $  11.18    $  11.08
Operating                                                                  --------    --------    --------    --------    --------
Performance:            Investment income--net ..........................       .53         .53         .58         .59         .60
                        Realized and unrealized gain (loss) on
                        investments--net ................................      (.31)       (.38)        .09         .45         .10
                                                                           --------    --------    --------    --------    --------
                        Total from investment operations ................       .22         .15         .67        1.04         .70
                                                                           --------    --------    --------    --------    --------
                        Less dividends and distributions:
                          Investment income--net ........................      (.53)       (.53)       (.58)       (.59)       (.60)
                          Realized gain on investments--net .............        --        (.16)       (.15)       (.03)         --
                          In excess of realized gain on
                          investments--net ..............................      (.06)       (.08)         --          --          --
                                                                           --------    --------    --------    --------    --------
                        Total dividends and distributions ...............      (.59)       (.77)       (.73)       (.62)       (.60)
                                                                           --------    --------    --------    --------    --------
                        Net asset value, end of year ....................  $  10.55    $  10.92    $  11.54    $  11.60    $  11.18
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Total Investment        Based on net asset value per share ..............     2.25%       1.29%       6.00%       9.61%       6.42%
Return:*                                                                   ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Ratios to Average       Expenses ........................................      .91%        .90%        .83%        .84%        .86%
Net Assets:                                                                ========    ========    ========    ========    ========
                        Investment income--net ..........................     5.09%       4.69%       5.01%       5.26%       5.31%
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
Supplemental            Net assets, end of year (in thousands) ..........  $  6,673    $  9,900    $  8,143    $  5,348    $  3,583
Data:                                                                      ========    ========    ========    ========    ========
                        Portfolio turnover ..............................    51.32%      43.18%      46.87%      49.82%      58.33%
                                                                           ========    ========    ========    ========    ========
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

* Total investment returns exclude the effects of sales charges.

  See Notes to Financial Statements.


14
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

NOTES TO FINANCIAL STATEMENTS

1. Significant Accounting Policies:

Merrill Lynch Pennsylvania Municipal Bond Fund (the "Fund") is part of Merrill
Lynch Multi-State Municipal Series Trust (the "Trust"). The Fund is registered
under the Investment Company Act of 1940 as a non-diversified, open-end
management investment company. The Fund's financial statements are prepared in
accordance with accounting principles generally accepted in the United States of
America, which may require the use of management accruals and estimates. The
Fund offers four classes of shares under the Merrill Lynch Select Pricing(SM)
System. Shares of Class A and Class D are sold with a front-end sales charge.
Shares of Class B and Class C may be subject to a contingent deferred sales
charge. All classes of shares have identical voting, dividend, liquidation and
other rights and the same terms and conditions, except that Class B, Class C and
Class D Shares bear certain expenses related to the account maintenance of such
shares, and Class B and Class C Shares also bear certain expenses related to the
distribution of such shares. Each class has exclusive voting rights with respect
to matters relating to its account maintenance and distribution expenditures.
The following is a summary of significant accounting policies followed by the
Fund.

(a) Valuation of investments--Municipal bonds and other portfolio securities in
which the Fund invests are traded primarily in the over-the-counter municipal
bond and money markets and are valued at the last available bid price in the
over-the-counter market or on the basis of yield equivalents as obtained from
one or more dealers that make markets in the securities. Financial futures
contracts and options thereon, which are traded on exchanges, are valued at
their settlement prices as of the close of such exchanges. Short-term
investments with remaining maturities of sixty days or less are valued at
amortized cost, which approximates market value. Securities and assets for which
market quotations are not readily available are valued at fair value as
determined in good faith by or under the direction of the Board of Trustees of
the Trust, including valuations furnished by a pricing service retained by the
Trust, which may utilize a matrix system for valuations. The procedures of the
pricing service and its valuations are reviewed by the officers of the Trust
under the general supervision of the Trustees.

(b) Derivative financial instruments--The Fund may engage in various portfolio
investment strategies to increase or decrease the level of risk to which the
Fund is exposed more quickly and efficiently than transactions in other types of
instruments. Losses may arise due to changes in the value of the contract or if
the counterparty does not perform under the contract.

o Financial futures contracts--The Fund may purchase or sell financial futures
contracts and options on such futures contracts for the purpose of hedging the
market risk on existing securities or the intended purchase of securities.
Futures contracts are contracts for delayed delivery of securities at a specific
future date and at a specific price or yield. Upon entering into a contract, the
Fund deposits and maintains as collateral such initial margin as required by the
exchange on which the transaction is effected. Pursuant to the contract, the
Fund agrees to receive from or pay to the broker an amount of cash equal to the
daily fluctuation in value of the contract. Such receipts or payments are known
as variation margin and are recorded by the Fund as unrealized gains or losses.
When the contract is closed, the Fund records a realized gain or loss equal to
the difference between the value of the contract at the time it was opened and
the value at the time it was closed.

(c) Income taxes--It is the Fund's policy to comply with the requirements of the
Internal Revenue Code applicable to regulated investment companies and to
distribute substantially all of its taxable income to its shareholders.
Therefore, no Federal income tax provision is required.

(d) Security transactions and investment income--Security transactions are
recorded on the dates the transactions are entered into (the trade dates).
Interest income is recognized on the accrual basis. Discounts and market
premiums are amortized into interest income. Realized gains and losses on
security transactions are determined on the identified cost basis.

(e) Prepaid registration fees--Prepaid registration fees are charged to expense
as the related shares are issued.


15
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

NOTES TO FINANCIAL STATEMENTS (continued)

(f) Dividends and distributions--Dividends from net investment income are
declared daily and paid monthly. Distributions of capital gains are recorded on
the ex-dividend dates. Distributions in excess of realized capital gains are due
primarily to differing tax treatments for futures transactions and post-October
losses.

2. Investment Advisory Agreement and Transactions with Affiliates:

The Fund has entered into an Investment Advisory Agreement with Fund Asset
Management, L.P. ("FAM"). The general partner of FAM is Princeton Services, Inc.
("PSI"), an indirect wholly-owned subsidiary of Merrill Lynch & Co., Inc. ("ML &
Co."), which is the limited partner. The Fund has also entered into a
Distribution Agreement and Distribution Plans with FAM Distributors, Inc.
("FAMD" or the "Distributor"), which is a wholly-owned subsidiary of Merrill
Lynch Group, Inc.

FAM is responsible for the management of the Fund's portfolio and provides the
necessary personnel, facilities, equipment and certain other services necessary
to the operations of the Fund. For such services, the Fund pays a monthly fee
based upon the average daily value of the Fund's net assets at the following
annual rates: .55% of the Fund's average daily net assets not exceeding $500
million; .525% of average daily net assets in excess of $500 million but not
exceeding $1 billion; and .50% of average daily net assets in excess of $1
billion.

Pursuant to the Distribution Plans adopted by the Fund in accordance with Rule
12b-1 under the Investment Company Act of 1940, the Fund pays the Distributor
ongoing account maintenance and distribution fees. The fees are accrued daily
and paid monthly at annual rates based upon the average daily net assets of the
shares as follows:

--------------------------------------------------------------------------------
                                                      Account       Distribution
                                                  Maintenance Fee       Fee
--------------------------------------------------------------------------------
Class B .......................................        .25%             .25%
Class C .......................................        .25%             .35%
Class D .......................................        .10%              --
--------------------------------------------------------------------------------

Pursuant to a sub-agreement with the Distributor, Merrill Lynch, Pierce, Fenner
& Smith Incorporated ("MLPF&S"), a subsidiary of ML & Co., also provides account
maintenance and distribution services to the Fund. The ongoing account
maintenance fee compensates the Distributor and MLPF&S for providing account
maintenance services to Class B, Class C and Class D shareholders. The ongoing
distribution fee compensates the Distributor and MLPF&S for providing
shareholder and distribution-related services to Class B and Class C
shareholders.

For the year ended July 31, 2000, FAMD earned underwriting discounts and MLPF&S
earned dealer concessions on sales of the Fund's Class A and Class D Shares as
follows:

--------------------------------------------------------------------------------
                                                             FAMD         MLPF&S
--------------------------------------------------------------------------------
Class A .................................................    $101         $   --
Class D .................................................    $634         $5,869
--------------------------------------------------------------------------------

For the year ended July 31, 2000, MLPF&S received contingent deferred sales
charges of $116,169 and $676 relating to transactions in Class B and Class C
Shares, respectively.

Financial Data Services, Inc. ("FDS"), a wholly-owned subsidiary of ML & Co., is
the Fund's transfer agent.

Accounting services are provided to the Fund by FAM at cost.

Certain officers and/or trustees of the Fund are officers and/or directors of
FAM, PSI, FDS, FAMD, and/or ML & Co.

3. Investments:

Purchases and sales of investments, excluding short-term securities, for the
year ended July 31, 2000 were $52,731,507 and $75,768,200, respectively.

Net realized losses for the year ended July 31, 2000 and net unrealized gains as
of July 31, 2000 were as follows:

--------------------------------------------------------------------------------
                                                  Realized            Unrealized
                                                   Losses               Gains
--------------------------------------------------------------------------------
Long-term investments ....................      $(4,052,327)         $ 3,231,234
                                                -----------          -----------
Total ....................................      $(4,052,327)         $ 3,231,234
                                                ===========          ===========
--------------------------------------------------------------------------------


16
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

As of July 31, 2000, net unrealized appreciation for Federal income tax purposes
aggregated $3,231,234, of which $3,880,514 related to appreciated securities and
$649,280 related to depreciated securities. The aggregate cost of investments at
July 31, 2000 for Federal income tax purposes was $93,449,504.

4. Beneficial Interest Transactions:

Net decrease in net assets derived from beneficial interest transactions was
$29,220,983 and $1,545,558 for the years ended July 31, 2000 and July 31, 1999,
respectively.

Transactions in shares of beneficial interest for each class were as follows:

--------------------------------------------------------------------------------
Class A Shares for the Year                                           Dollar
Ended July 31, 2000                               Shares              Amount
--------------------------------------------------------------------------------
Shares sold ............................            140,454        $  1,461,681
Shares issued to share-
holders in reinvestment of
dividends and distributions ............             46,232             480,729
                                               ------------        ------------
Total issued ...........................            186,686           1,942,410
Shares redeemed ........................           (603,176)         (6,278,820)
                                               ------------        ------------
Net decrease ...........................           (416,490)       $ (4,336,410)
                                               ============        ============
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
Class A Shares for the Year                                           Dollar
Ended July 31, 1999                               Shares              Amount
--------------------------------------------------------------------------------
Shares sold ............................            267,829        $  3,057,374
Shares issued to share-
holders in reinvestment of
dividends and distributions ............             74,279             844,684
                                               ------------        ------------
Total issued ...........................            342,108           3,902,058
Shares redeemed ........................           (338,910)         (3,837,226)
                                               ------------        ------------
Net increase ...........................              3,198        $     64,832
                                               ============        ============
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
Class B Shares for the Year                                           Dollar
Ended July 31, 2000                               Shares              Amount
--------------------------------------------------------------------------------
Shares sold ............................            479,787        $  5,012,194
Shares issued to share-
holders in reinvestment of
dividends and distributions ............            190,951           1,984,457
                                               ------------        ------------
Total issued ...........................            670,738           6,996,651
Automatic conversion
of shares ..............................            (53,770)           (562,448)
Shares redeemed ........................         (2,640,369)        (27,502,554)
                                               ------------        ------------
Net decrease ...........................         (2,023,401)       $(21,068,351)
                                               ============        ============
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
Class B Shares for the Year                                           Dollar
Ended July 31, 1999                               Shares              Amount
--------------------------------------------------------------------------------
Shares sold ............................          1,336,166        $ 15,320,856
Shares issued to share-
holders in reinvestment of
dividends and distributions ............            303,934           3,456,996
                                               ------------        ------------
Total issued ...........................          1,640,100          18,777,852
Automatic conversion
of shares ..............................            (19,073)           (214,664)
Shares redeemed ........................         (2,036,509)        (23,074,098)
                                               ------------        ------------
Net decrease ...........................           (415,482)       $ (4,510,910)
                                               ============        ============
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
Class C Shares for the Year                                           Dollar
Ended July 31, 2000                               Shares              Amount
--------------------------------------------------------------------------------
Shares sold ............................             87,286        $    918,518
Shares issued to share-
holders in reinvestment of
dividends and distributions ............             20,060             208,399
                                               ------------        ------------
Total issued ...........................            107,346           1,126,917
Shares redeemed ........................           (199,958)         (2,086,855)
                                               ------------        ------------
Net decrease ...........................            (92,612)       $   (959,938)
                                               ============        ============
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
Class C Shares for the Year                                           Dollar
Ended July 31, 1999                               Shares              Amount
--------------------------------------------------------------------------------
Shares sold ............................            172,331        $  1,969,269
Shares issued to share-
holders in reinvestment of
dividends and distributions ............             27,609             313,913
                                               ------------        ------------
Total issued ...........................            199,940           2,283,182
Shares redeemed ........................           (151,043)         (1,724,514)
                                               ------------        ------------
Net increase ...........................             48,897        $    558,668
                                               ============        ============
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
Class D Shares for the Year                                           Dollar
Ended July 31, 2000                               Shares              Amount
--------------------------------------------------------------------------------
Shares sold ............................             87,660        $    909,319
Automatic conversion
of shares ..............................             53,700             562,448
Shares issued to share-
holders in reinvestment of
dividends and distributions ............             23,766             247,447
                                               ------------        ------------
Total issued ...........................            165,126           1,719,214
Shares redeemed ........................           (439,622)         (4,575,498)
                                               ------------        ------------
Net decrease ...........................           (274,496)       $ (2,856,284)
                                               ============        ============
--------------------------------------------------------------------------------


17
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

NOTES TO FINANCIAL STATEMENTS (concluded)

--------------------------------------------------------------------------------
Class D Shares for the Year                                           Dollar
Ended July 31, 1999                               Shares              Amount
--------------------------------------------------------------------------------
Shares sold ............................            351,096        $  4,056,147
Automatic conversion
of shares ..............................             19,052             214,664
Shares issued to share-
holders in reinvestment of
dividends and distributions ............             37,233             423,537
                                               ------------        ------------
Total issued ...........................            407,381           4,694,348
Shares redeemed ........................           (206,168)         (2,352,496)
                                               ------------        ------------
Net increase ...........................            201,213        $  2,341,852
                                               ============        ============
--------------------------------------------------------------------------------

5. Short-Term Borrowings:

On December 3, 1999, the Fund, along with certain other funds managed by FAM and
its affiliates, entered into a one-year, unsecured $1,000,000,000 credit
agreement with The Bank of New York and other lenders. The funds may borrow
money for temporary or emergency purposes to meet shareholder redemptions. Each
fund may borrow up to the maximum amount allowable under the fund's current
prospectus and statement of additional information, subject to various other
legal, regulatory or contractual limits. The funds collectively pay a commitment
fee of .09% per annum on the available portion of the facility. Amounts borrowed
under the facility bear interest at the Federal Funds rate plus .50%. The Fund
did not borrow from the facility during the year ended July 31, 2000.

6. Capital Loss Carryforward:

At July 31, 2000, the Fund had a net capital loss carryforward of approximately
$671,000, all of which expires in 2008. This amount will be available to offset
like amounts of any future taxable gains.

INDEPENDENT AUDITORS' REPORT

The Board of Trustees and Shareholders,
Merrill Lynch Pennsylvania Municipal Bond Fund
of Merrill Lynch Multi-State Municipal Series Trust:

We have audited the accompanying statement of assets and liabilities, including
the schedule of investments, of Merrill Lynch Pennsylvania Municipal Bond Fund
of Merrill Lynch Multi-State Municipal Series Trust as of July 31, 2000, the
related statements of operations for the year then ended and changes in net
assets for each of the years in the two-year period then ended, and the
financial highlights for each of the years in the five-year period then ended.
These financial statements and the financial highlights are the responsibility
of the Fund's management. Our responsibility is to express an opinion on these
financial statements and the financial highlights based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States of America. Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements and the financial highlights are free of material misstatement. An
audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements. Our procedures included confirmation of
securities owned at July 31, 2000 by correspondence with the custodian and
broker. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, such financial statements and financial highlights present
fairly, in all material respects, the financial position of Merrill Lynch
Pennsylvania Municipal Bond Fund of Merrill Lynch Multi-State Municipal Series
Trust as of July 31, 2000, the results of its operations, the changes in its net
assets, and the financial highlights for the respective stated periods in
conformity with accounting principles generally accepted in the United States of
America.

Deloitte & Touche LLP
Princeton, New Jersey
September 6, 2000


18
<PAGE>

Merrill Lynch Pennsylvania Municipal Bond Fund                     July 31, 2000

IMPORTANT TAX INFORMATION (unaudited)

All of the net investment income distributions paid monthly by Merrill Lynch
Pennsylvania Municipal Bond Fund during its taxable year ended July 31, 2000
qualify as tax-exempt interest dividends for Federal income tax purposes.

Additionally, the Fund paid a long-term capital gain distribution of $.057786
per share, payable on December 31, 1999 to shareholders of record as of December
20, 1999. The entire distribution is subject to a maximum 20% tax rate.

Please retain this information for your records.

OFFICERS AND TRUSTEES

Terry K. Glenn, President and Trustee
James H. Bodurtha, Trustee
Herbert I. London, Trustee
Joseph L. May, Trustee
Andre F. Perold, Trustee
Arthur Zeikel, Trustee
Vincent R. Giordano, Senior Vice President
William M. Bock, Vice President
Kenneth A. Jacob, Vice President
Donald C. Burke, Vice President and Treasurer
Alice A. Pellegrino, Secretary

Custodian

State Street Bank and Trust Company
P.O. Box 351
Boston, MA 02101

Transfer Agent

Financial Data Services, Inc.
4800 Deer Lake Drive East
Jacksonville, FL 32246-6484
(800) 637-3863


19
<PAGE>

This report is not authorized for use as an offer of sale or a solicitation of
an offer to buy shares of the Fund unless accompanied or preceded by the Fund's
current prospectus. Past performance results shown in this report should not be
considered a representation of future performance. Investment return and
principal value of shares will fluctuate so that shares, when redeemed, may be
worth more or less than their original cost. Statements and other information
herein are as dated and are subject to change.

Merrill Lynch Pennsylvania
Municipal Bond Fund
Merrill Lynch Multi-State
Municipal Series Trust
Box 9011
Princeton, NJ
08543-9011                                                          #11299--7/00

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