MERRILL LYNCH MARYLAND MUNICIPAL BOND FUND OF MLMSMST
N-30D, 2000-03-15
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MERRILL LYNCH
MARYLAND
MUNICIPAL
BOND FUND



FUND LOGO



Semi-Annual Report

January 31, 2000



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 Maryland
Municipal Bond Fund
Merrill Lynch Multi-State
Municipal Series Trust
Box 9011
Princeton, NJ
08543-9011


Printed on post-consumer recycled paper



Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


TO OUR SHAREHOLDERS


The Municipal Market Environment
During the six months ended January 31, 2000, continued strong
domestic growth, gradual improvement in foreign economies and
investor concerns regarding future inflationary pressures pushed
long-term fixed-income bond yields higher. The Federal Reserve Board
continued to raise short-term interest rates in August and November
1999 as well as just after the period's close, seeking to moderate
US economic growth and maintain the existing benign inflationary
environment. US economic growth, in part intensified by Year 2000
preparations, grew 5.8% during the last fiscal quarter of 1999 and
had an annual rate of 4.1% for 1999. A number of inflationary
indicators have also begun to signal some increase in price
pressures.

However, most investors believe that the Federal Reserve Board will
be extremely vigilant in preventing such pressures from any material
escalation. US Treasury bond yields responded by rising
approximately 60 basis points (0.60%) by mid-January 2000. A strong
rally, largely based upon an expected significant reduction in the
future supply of US Treasury 30-year maturity bonds, pushed yields
lower to 6.50% at January 31, 2000. Over the last six months, yields
on 30-year US Treasury bonds rose approximately 40 basis points.

The tax-exempt bond market was also under pressure throughout the
entire period. Despite receiving more than $30 billion in coupon
payments, bond maturities and proceeds from early redemptions in
December and January, overall investor demand has diminished. It is
likely that the returns generated by the US equity market have
continued to attract investor attention and have left little demand
for competing investment alternatives. At January 31, 2000, the long-
term tax-exempt revenue bond yield, as measured by the Bond Buyer
Revenue Index, was 6.34%, an increase of nearly 70 basis points over
the last six months.

Issuance by municipalities has significantly declined in recent
months. Over the last six months, less than $100 billion in long-
term tax-exempt bonds were issued, representing a decline of over
20% compared to the same period a year ago. During the last three
months, less than $45 billion in long-term bonds were issued by
various municipalities. This most recent quarterly issuance is 30%
below the level of the January 31, 1999 quarter. Additionally,
during January 2000, less than $8 billion in municipal debt was
underwritten, down more than 50% from January 1999 levels. This
represents the lowest monthly issuance in over five years. Toward
the end of 1999, consensus estimates for 2000 annual issuance were
in the $210 billion--$215 billion range. January's underwritings, as
well as those expected to be issued in the near future, have led
some analysts to revise their forecasts to the $190 billion range.

We believe an overall reduction in bond supply in the coming year
should help support the municipal bond market's overall technical
position. While tax-exempt bond yields, which are at their highest
level in over three years, have attracted significant retail
investor interest, institutional demand declined sharply. Long-term
municipal mutual funds have seen consistent outflows in recent
months as the yields of individual securities rose faster than those
of larger, more diverse mutual funds. During the six months ended
January 31, 2000, tax-exempt mutual funds have had net redemptions
of approximately $9 billion. Also, the demand from property and
casualty insurance companies has weakened as a result of the losses
and anticipated losses incurred from a series of damaging storms
across much of the eastern United States. Additionally, many
institutional investors who have in recent years been attracted to
the municipal bond market by historically attractive tax-exempt bond
yield ratios of over 90%, found other asset classes even more
attractive. Even with a reduced supply position, tax-exempt issuers
have been forced to repeatedly raise municipal bond yields in an
attempt to attract adequate demand. We believe a reduced bond supply
going forward is likely to promote a more closely balanced
supply/demand structure and foster a more stable tax-exempt interest
rate environment.

Looking ahead, it appears to us that long-term tax-exempt bond
yields will remain under pressure, trading in a broad range centered
around current levels. Investors are also likely to remain concerned
regarding future action by the Federal Reserve Board in early 2000.
Any improvement in bond prices may be contingent upon weakening in
both US employment growth and consumer spending. The 100 basis

Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000

point rise in US Treasury bond yields seen thus far could negatively
affect US economic growth. The US housing market is likely to be
among the first sectors to be affected, as some declines have
already been evidenced because of higher mortgage rates. We believe
it is also unrealistic to expect double-digit returns in US equity
markets to continue indefinitely. Much of the US consumer's wealth
is tied to recent stock market appreciation. Any slowing in these
incredible growth rates may reduce consumer spending. We believe
that these factors suggest that the worst of the recent increase in
bond yields has passed and stable, if not slightly improving, bond
prices may be expected.


Portfolio Strategy
During the six months ended January 31, 2000, we initially retained
a defensive position toward the municipal bond market, then
gradually shifted to a neutral stance. We accomplished this goal by
investing a substantial portion of the Fund's cash reserves. Since
the spring of 1997, our strategy has been to seek to enhance income
and to take advantage of the highest absolute municipal yields.
During the period, we also sought to capitalize on market
discrepancies, caused in part by Year 2000 concerns, by purchasing
bonds we believed to be undervalued combined with selling bonds we
believed to be overvalued.

Maryland bond issuance was comparatively light during the six-month
period ended January 31, 2000. Maryland bond prices remained
relatively firm compared to the national level because of the light
issuance. However, the light issuance presented us with fewer
opportunities within the municipal bond market.

Looking ahead, we intend to remain fully invested in the municipal
market in an effort to enhance shareholder income. We do not expect
to significantly alter our present stance toward the market given
the current economic backdrop. We will continue to take advantage of
any opportunities in the municipal marketplace that we believe is
appropriate.


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

Sincerely,



(Terry K. Glenn)
Terry K. Glenn
President



(Vincent R. Giordano)
Vincent R. Giordano
Senior Vice President



(Michael Kalinoski)
Michael Kalinoski
Vice President and Portfolio Manager



March 3, 2000


We are pleased to announce that Michael A. Kalinoski is responsible
for the day-to-day management of Merrill Lynch Maryland Municipal
Bond Fund. Mr. Kalinoski has been employed by Merrill Lynch Asset
Management, L.P. since 1999 as Vice President and Portfolio Manager.
Mr. Kalinoski was previously employed from 1993 to 1999 as a
municipal trader with Strong Capital Management.




Merrill Lynch Maryland Municipal Bond Fund
January 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:

* 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.

* 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.)

* 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.

* 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. The Fund's Investment Adviser voluntarily waived a
portion of its management fee. Without such waiver, the Fund's
performance would have been lower.


<TABLE>
Recent Performance Results*
                                                     6 Month           12 Month       Since Inception     Standardized
As of January 31, 2000                             Total Return      Total Return       Total Return      30-Day Yield
<S>                                                    <C>               <C>              <C>                 <C>
ML Maryland Municipal Bond Fund Class A Shares         -2.76%            -4.95%           +24.21%             4.68%
ML Maryland Municipal Bond Fund Class B Shares         -3.01             -5.53            +20.31              4.36
ML Maryland Municipal Bond Fund Class C Shares         -3.06             -5.62            +29.86              4.25
ML Maryland Municipal Bond Fund Class D Shares         -2.71             -5.05            +33.44              4.58

*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 10/29/93 for Class A & Class B
 Shares and from 10/21/94 for Class C & Class D Shares.
</TABLE>



Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


PERFORMANCE DATA (concluded)


Average Annual Total Return

                                     % Return Without % Return With
                                       Sales Charge    Sales Charge**

Class A Shares*

Year Ended 12/31/99                        -3.39%         -7.26%
Five Years Ended 12/31/99                  +6.42          +5.55
Inception (10/29/93)
through 12/31/99                           +3.66          +2.97

 *Maximum sales charge is 4%.
**Assuming maximum sales charge.


                                         % Return        % Return
                                       Without CDSC     With CDSC**

Class B Shares*

Year Ended 12/31/99                        -3.88%         -7.57%
Five Years Ended 12/31/99                  +5.88          +5.88
Inception (10/29/93)
through 12/31/99                           +3.13          +3.13

 *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*

Year Ended 12/31/99                        -3.88%         -4.80%
Five Years Ended 12/31/99                  +5.79          +5.79
Inception (10/21/94)
through 12/31/99                           +5.29          +5.29

 *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*

Year Ended 12/31/99                        -3.49%         -7.35%
Five Years Ended 12/31/99                  +6.31          +5.45
Inception (10/21/94)
through 12/31/99                           +5.81          +4.98

 *Maximum sales charge is 4%.
**Assuming maximum sales charge.



Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


<TABLE>
SCHEDULE OF INVESTMENTS                                                                               (in Thousands)
<CAPTION>
S&P       Moody's     Face
Ratings    Ratings   Amount                           Issue                                                     Value

Maryland--97.1%
<S>         <S>      <C>      <S>                                                                                <C>
NR*         NR*      $  500   Anne Arundel County, Maryland, Special Obligation Revenue Bonds
                              (Arundel Mills Project), 7.10% due 7/01/2029                                       $   487

AAA         Aaa       1,000   Baltimore, Maryland, Baltimore City Parking System Facilities Revenue
                              Refunding Bonds, Series A, 5.25% due 7/01/2021 (a)                                     903

A1+         Aa3       1,000   Baltimore, Maryland, Port Facilities Revenue Refunding Bonds (Consolidated
                              Coal Sales), 6.50% due 12/01/2010                                                    1,058

AA          Aa3         600   Carroll County, Maryland, GO (County Commissioners-Consolidated Public
                              Improvement), 6.50% due 10/01/2024                                                     613

AA          Aa2       1,000   Frederick County, Maryland, GO, Refunding (Public Facilities), 5.25%
                              due 7/01/2016                                                                          932

NR*         Aa2       1,000   Maryland State Community Development Administration, Department of Housing and
                              Community Development, Housing Revenue Bonds, AMT, Series B, 6.15% due 1/01/2021       976

NR*         Aa2       1,250   Maryland State Community Development Administration, Department of Housing
                              and Community Development, Residential Revenue Refunding Bonds, Series A,
                              5.60% due 3/01/2017 (b)                                                              1,172

                              Maryland State Community Development Administration, Department of Housing and
                              Community Development Revenue Refunding Bonds, S/F Program:
NR*         Aa2         500     4th Series, 6.45% due 4/01/2014                                                      507
NR*         Aa2         250     6th Series, 7.05% due 4/01/2017                                                      255

AA          Aa2         500   Maryland State Department of Transportation, Consolidated Transportation Revenue
                              Bonds, 5.75% due 12/15/2014                                                            501

NR*         NR*         440   Maryland State Economic Development Corporation Revenue Bonds (Health and Mental
                              Hygiene Program), Series A, 7.125% due 3/01/2006                                       440

A-          NR*       1,000   Maryland State Energy Financing Administration, Solid Waste Disposal Revenue Bonds,
                              Limited Obligation (Wheelabrator Water Projects), AMT, 6.45% due 12/01/2016            990

                              Maryland State Health and Higher Educational Facilities Authority Revenue Bonds:
AA          Aa2       1,915     (Hospital-Charity Obligation Group), Series A, 5% due 11/01/2029                   1,567
AAA         Aaa       1,000     (Johns Hopkins Medicine), 5% due 7/01/2029 (f)                                       825
AAA         Aaa         625     (University of Maryland Medical System), Series B, 7% due 7/01/2022 (a)              700

                              Maryland State Health and Higher Educational Facilities Authority, Revenue
                              Refunding Bonds:
AAA         Aaa       1,470     (Maryland General Hospital), 6.125% due 7/01/2019 (f)                              1,476
AA+         A2        1,200     (Memorial Hospital of Cumberland), 6.50% due 7/01/2004 (g)                         1,271
NR*         VMIG1++     900     (Pooled Loan Program), VRDN, Series A, 3.15% due 4/01/2035 (i)                       900
</TABLE>


PORTFOLIO ABBREVIATIONS

To simplify the listings of Merrill Lynch Maryland 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 at right.

AMT        Alternative Minimum Tax (subject to)
GO         General Obligation Bonds
PCR        Pollution Control Revenue Bonds
S/F        Single-Family
STRIPES    Short-Term Rate Inverse Payment Exempt Securities
VRDN       Variable Rate Demand Notes




Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


<TABLE>
SCHEDULE OF INVESTMENTS (concluded)                                                                   (in Thousands)
<CAPTION>
S&P       Moody's     Face
Ratings    Ratings   Amount                           Issue                                                     Value

Maryland (concluded)
<S>         <S>      <C>      <S>                                                                                <C>
AAA         Aaa      $  500   Maryland State Transportation Authority, Special Obligation Revenue Bonds
                              (Baltimore/Washington International Airport Project), AMT, Series A,
                              6.25% due 7/01/2014 (a)                                                            $   509

                              Maryland Water Quality Financing Administration, Revolving Loan Fund Revenue
                              Bonds, Series A:
AA          Aa2         300     6.375% due 9/01/2010                                                                 315
AA          Aa2         500     6.55% due 9/01/2014                                                                  522

AAA         Aaa         500   Montgomery County, Maryland, GO, Refunding (Consolidated Public Improvement),
                              Series A, 5.80% due 7/01/2007                                                          522

NR*         Baa       1,000   Montgomery County, Maryland, Revenue Authority, Golf Course System Revenue Bonds,
                              Series A, 6.125% due 10/01/2022                                                        912

NR*         Aa2         440   Montgomery County, Maryland, Housing Opportunities Commission, S/F Mortgage
                              Revenue Refunding Bonds, Series A, 5.75% due 7/01/2013                                 434

AAA         Aaa         500   Montgomery County, Maryland, Parking Authority, Revenue Refunding Bonds
                              (Silver Spring Parking Lot), Series A, 6.25% due 6/01/2009 (a)                         525

NR*         A2        1,000   Northeast Maryland, Waste Disposal Authority, Solid Waste Revenue Bonds
                              (Montgomery County Resource Recovery Project), AMT, Series A, 6.30% due
                              7/01/2016                                                                            1,008

AAA         NR*         500   Prince Georges County, Maryland, Housing Authority, Mortgage Revenue
                              Refunding Bonds (Parker Apartments Project), Series A, 7.25% due 11/20/2016 (e)        524

AAA         NR*         825   Prince Georges County, Maryland, Housing Authority, S/F Mortgage Revenue
                              Bonds, AMT, Series A, 6.60% due 12/01/2025 (c)                                         836

                              Prince Georges County, Maryland, PCR, Refunding (Potomac Electric Project):
A           A1        2,250     5.75% due 3/15/2010                                                                2,304
A           A1          250     6.375% due 1/15/2023                                                                 252

A1+         VMIG1++     200   University of Maryland, University Revenue Bonds (Revolving Equipment
                              Loan Program), VRDN, Series B, 3.15% due 7/01/2015 (i)                                 200

Puerto Rico--3.9%

A           Aaa         510   Puerto Rico Commonwealth, Highway and Transportation Authority, Highway Revenue
                              Bonds, Series T, 6.625% due 7/01/2002 (g)                                              541

AAA         Aaa         400   Puerto Rico Electric Power Authority, Power Revenue Bonds, STRIPES, Series T,
                              7.827% due 7/01/2005 (d)(h)                                                            431

Total Investments (Cost--$25,895)--101.0%                                                                         25,408

Liabilities in Excess of Other Assets--(1.0%)                                                                       (255)
                                                                                                                 -------
Net Assets--100.0%                                                                                               $25,153
                                                                                                                 =======



(a)FGIC Insured.
(b)FHA Insured.
(c)FNMA/GNMA Collateralized.
(d)FSA Insured.
(e)GNMA Collateralized.
(f)MBIA Insured.
(g)Prerefunded.
(h)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 January 31, 2000.
(i)The interest rate is subject to change periodically based upon
   prevailing market rates. The interest rate shown is the rate in
   effect at January 31, 2000.
  *Not Rated.
 ++Highest short-term rating by Moody's Investors Service, Inc.

   See Notes to Financial Statements.
</TABLE>


Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


FINANCIAL INFORMATION (continued)

<TABLE>
Statement of Assets and Liabilities as of January 31, 2000
<S>                 <S>                                                                    <C>              <C>
Assets:             Investments, at value (identified cost--$25,895,450)                                    $ 25,408,099
                    Cash                                                                                          41,001
                    Receivables:
                      Interest                                                             $    300,304
                      Beneficial interest sold                                                   34,009          334,313
                                                                                           ------------
                    Prepaid expenses and other assets                                                                427
                                                                                                            ------------
                    Total assets                                                                              25,783,840
                                                                                                            ------------

Liabilities:        Payables:
                      Securities purchased                                                      440,000
                      Beneficial interest redeemed                                               68,587
                      Dividends to shareholders                                                  21,865
                      Distributor                                                                 9,196
                      Investment adviser                                                          5,086          544,734
                                                                                           ------------
                    Accrued expenses and other liabilities                                                        85,845
                                                                                                            ------------
                    Total liabilities                                                                            630,579
                                                                                                            ------------

Net Assets:         Net assets                                                                              $ 25,153,261
                                                                                                            ============

Net Assets          Class A Shares of beneficial interest, $.10 par value,
Consist of:         unlimited number of shares authorized                                                   $     22,879
                    Class B Shares of beneficial interest, $.10 par value,
                    unlimited number of shares authorized                                                        220,583
                    Class C Shares of beneficial interest, $.10 par value,
                    unlimited number of shares authorized                                                         22,246
                    Class D Shares of beneficial interest, $.10 par value,
                    unlimited number of shares authorized                                                         11,244
                    Paid-in capital in excess of par                                                          26,732,738
                    Accumulated realized capital losses on investments--net                                   (1,369,078)
                    Unrealized depreciation on investments--net                                                 (487,351)
                                                                                                            ------------
                    Net assets                                                                              $ 25,153,261
                                                                                                            ============

Net Asset Value:    Class A--Based on net assets of $2,077,515 and 228,788 shares of
                    beneficial interest outstanding                                                         $       9.08
                                                                                                            ============
                    Class B--Based on net assets of $20,034,083 and 2,205,825 shares of
                    beneficial interest outstanding                                                         $       9.08
                                                                                                            ============
                    Class C--Based on net assets of $2,020,921 and 222,457 shares of
                    beneficial interest outstanding                                                         $       9.08
                                                                                                            ============
                    Class D--Based on net assets of $1,020,742 and 112,438 shares of
                    beneficial interest outstanding                                                         $       9.08
                                                                                                            ============

                    See Notes to Financial Statements.
</TABLE>


Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


FINANCIAL INFORMATION (continued)

<TABLE>
Statement of Operations
<CAPTION>
                                                                                                For the Six Months Ended
                                                                                                        January 31, 2000
<S>                 <S>                                                                    <C>              <C>
Investment Income:  Interest and amortization of premium and discount earned                                $    795,254

Expenses:           Investment advisory fees                                               $     77,853
                    Account maintenance and distribution fees--Class B                           56,165
                    Professional fees                                                            38,255
                    Accounting services                                                          33,250
                    Account maintenance and distribution fees--Class C                            7,908
                    Printing and shareholder reports                                              7,297
                    Transfer agent fees--Class B                                                  7,206
                    Registration fees                                                             4,902
                    Pricing fees                                                                  3,201
                    Custodian fees                                                                1,909
                    Trustees' fees and expenses                                                   1,096
                    Transfer agent fees--Class C                                                    879
                    Transfer agent fees--Class A                                                    582
                    Account maintenance fees--Class D                                               535
                    Transfer agent fees--Class D                                                    291
                    Other                                                                         1,021
                                                                                           ------------
                    Total expenses before reimbursement                                         242,350
                    Reimbursement of expenses                                                   (42,465)
                                                                                           ------------
                    Total expenses after reimbursement                                                           199,885
                                                                                                            ------------
                    Investment income--net                                                                       595,369
                                                                                                            ------------

Realized &          Realized loss on investments--net                                                            (49,354)
Unrealized          Change in unrealized appreciation/depreciation on investments--net                        (1,409,280)
Loss on                                                                                                     ------------
Investments--Net:   Net Decrease in Net Assets Resulting from Operations                                    $   (863,265)
                                                                                                            ============

                    See Notes to Financial Statements.
</TABLE>


Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


FINANCIAL INFORMATION (continued)

<TABLE>
Statements of Changes in Net Assets
<CAPTION>
                                                                                           For the Six         For the
                                                                                           Months Ended       Year Ended
                                                                                           January 31,         July 31,
Increase (Decrease) in Net Assets:                                                             2000              1999
<S>                 <S>                                                                    <C>              <C>
Operations:         Investment income--net                                                 $    595,369     $  1,232,721
                    Realized loss on investments--net                                           (49,354)          (1,243)
                    Change in unrealized appreciation/depreciation on
                    investments--net                                                         (1,409,280)        (845,175)
                                                                                           ------------     ------------
                    Net increase (decrease) in net assets resulting from
                    operations                                                                 (863,265)         386,303
                                                                                           ------------     ------------

Dividends to        Investment income--net:
Shareholders:         Class A                                                                   (50,013)        (101,565)
                      Class B                                                                  (467,457)        (969,356)
                      Class C                                                                   (53,428)        (107,774)
                      Class D                                                                   (24,471)         (54,026)
                                                                                           ------------     ------------
                    Net decrease in net assets resulting from
                    dividends to shareholders                                                  (595,369)      (1,232,721)
                                                                                           ------------     ------------

Beneficial          Net increase (decrease) in net assets derived from beneficial
Interest            interest transactions                                                    (4,324,807)       2,759,849
Transactions:                                                                              ------------     ------------

Net Assets:         Total increase (decrease) in net assets                                  (5,783,441)       1,913,431
                    Beginning of period                                                      30,936,702       29,023,271
                                                                                           ------------     ------------
                    End of period                                                          $ 25,153,261     $ 30,936,702
                                                                                           ============     ============

                    See Notes to Financial Statements.
</TABLE>



Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


FINANCIAL INFORMATION (continued)

<TABLE>
Financial Highlights
<CAPTION>
                                                                                            Class A

                                                                       For the
                                                                         Six
The following per share data and ratios have been derived               Months
from information provided in the financial statements.                  Ended
                                                                       Jan. 31,     For the Year Ended July 31,
Increase (Decrease) in Net Asset Value:                                  2000      1999       1998     1997      1996
<S>                 <S>                                               <C>        <C>       <C>       <C>        <C>
Per Share           Net asset value, beginning of period              $   9.56   $   9.80  $   9.66  $   9.21   $   9.15
Operating                                                             --------   --------  --------  --------   --------
Performance:        Investment income--net                                 .22        .43       .47       .48        .47
                    Realized and unrealized gain (loss) on
                    investments--net                                      (.48)      (.24)      .14       .45        .06
                                                                      --------   --------  --------  --------   --------
                    Total from investment operations                      (.26)       .19       .61       .93        .53
                                                                      --------   --------  --------  --------   --------
                    Less dividends from investment income--net            (.22)      (.43)     (.47)     (.48)      (.47)
                                                                      --------   --------  --------  --------   --------
                    Net asset value, end of period                    $   9.08   $   9.56  $   9.80  $   9.66   $   9.21
                                                                      ========   ========  ========  ========   ========

Total Investment    Based on net asset value per share                  (2.76%)++   1.87%     6.46%    10.35%      5.85%
Return:**                                                             ========   ========  ========  ========   ========

Ratios to Average   Expenses, net of reimbursement                        .94%*      .94%      .73%      .47%       .37%
Net Assets:                                                           ========   ========  ========  ========   ========
                    Expenses                                             1.24%*     1.26%     1.21%     1.32%      1.26%
                                                                      ========   ========  ========  ========   ========
                    Investment income--net                               4.64%*     4.35%     4.80%     5.11%      5.04%
                                                                      ========   ========  ========  ========   ========

Supplemental        Net assets, end of period (in thousands)          $  2,077   $  2,309  $  2,303  $  1,928   $  1,252
Data:                                                                 ========   ========  ========  ========   ========
                    Portfolio turnover                                  18.05%     30.98%    88.89%    94.90%     81.87%
                                                                      ========   ========  ========  ========   ========

<CAPTION>
                                                                                            Class B

                                                                       For the
                                                                         Six
The following per share data and ratios have been derived               Months
from information provided in the financial statements.                  Ended
                                                                       Jan. 31,     For the Year Ended July 31,
Increase (Decrease) in Net Asset Value:                                  2000      1999       1998     1997      1996
<S>                 <S>                                               <C>        <C>       <C>       <C>        <C>
Per Share           Net asset value, beginning of period              $   9.56   $   9.80  $   9.66  $   9.21   $   9.16
Operating                                                             --------   --------  --------  --------   --------
Performance:        Investment income--net                                 .19        .38       .42       .43        .42
                    Realized and unrealized gain (loss) on
                    investments--net                                      (.48)      (.24)      .14       .45        .05
                                                                      --------   --------  --------  --------   --------
                    Total from investment operations                      (.29)       .14       .56       .88        .47
                                                                      --------   --------  --------  --------   --------
                    Less dividends from investment income--net            (.19)      (.38)     (.42)     (.43)      (.42)
                                                                      --------   --------  --------  --------   --------
                    Net asset value, end of period                    $   9.08   $   9.56  $   9.80  $   9.66   $   9.21
                                                                      ========   ========  ========  ========   ========

Total Investment    Based on net asset value per share                  (3.01%)++   1.36%     5.92%     9.79%      5.19%
Return:**                                                             ========   ========  ========  ========   ========

Ratios to Average   Expenses, net of reimbursement                       1.45%*     1.45%     1.23%      .97%       .88%
Net Assets:                                                           ========   ========  ========  ========   ========
                    Expenses                                             1.74%*     1.77%     1.72%     1.82%      1.77%
                                                                      ========   ========  ========  ========   ========
                    Investment income--net                               4.13%*     3.84%     4.29%     4.59%      4.52%
                                                                      ========   ========  ========  ========   ========

Supplemental        Net assets, end of period (in thousands)          $ 20,034   $ 24,775  $ 23,306  $ 21,851   $ 22,053
Data:                                                                 ========   ========  ========  ========   ========
                    Portfolio turnover                                  18.05%     30.98%    88.89%    94.90%     81.87%
                                                                      ========   ========  ========  ========   ========


                   *Annualized.
                  **Total investment returns exclude the effects of sales charges.
                  ++Aggregate total investment return.

                    See Notes to Financial Statements.
</TABLE>


Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


FINANCIAL INFORMATION (concluded)

<TABLE>
Financial Highlights (concluded)
<CAPTION>
                                                                                            Class C

                                                                       For the
                                                                         Six
The following per share data and ratios have been derived               Months
from information provided in the financial statements.                  Ended
                                                                       Jan. 31,     For the Year Ended July 31,
Increase (Decrease) in Net Asset Value:                                  2000      1999       1998     1997      1996
<S>                 <S>                                               <C>        <C>       <C>       <C>        <C>
Per Share           Net asset value, beginning of period              $   9.56   $   9.80  $   9.67  $   9.22   $   9.16
Operating                                                             --------   --------  --------  --------   --------
Performance:        Investment income--net                                 .19        .37       .41       .42        .41
                    Realized and unrealized gain (loss) on
                    investments--net                                      (.48)      (.24)      .13       .45        .06
                                                                      --------   --------  --------  --------   --------
                    Total from investment operations                      (.29)       .13       .54       .87        .47
                                                                      --------   --------  --------  --------   --------
                    Less dividends from investment income--net            (.19)      (.37)     (.41)     (.42)      (.41)
                                                                      --------   --------  --------  --------   --------
                    Net asset value, end of period                    $   9.08   $   9.56  $   9.80  $   9.67   $   9.22
                                                                      ========   ========  ========  ========   ========

Total Investment    Based on net asset value per share                  (3.06%)++   1.26%     5.70%     9.67%      5.18%
Return:**                                                             ========   ========  ========  ========   ========

Ratios to Average   Expenses, net of reimbursement                       1.55%*     1.56%     1.34%     1.07%      1.00%
Net Assets:                                                           ========   ========  ========  ========   ========
                    Expenses                                             1.85%*     1.88%     1.82%     1.92%      1.88%
                                                                      ========   ========  ========  ========   ========
                    Investment income--net                               4.03%*     3.73%     4.19%     4.47%      4.39%
                                                                      ========   ========  ========  ========   ========

Supplemental        Net assets, end of period (in thousands)          $  2,021   $  2,762  $  2,307  $  2,038   $  2,229
Data:                                                                 ========   ========  ========  ========   ========
                    Portfolio turnover                                  18.05%     30.98%    88.89%    94.90%     81.87%
                                                                      ========   ========  ========  ========   ========


<CAPTION>
                                                                                            Class D

                                                                       For the
                                                                         Six
The following per share data and ratios have been derived               Months
from information provided in the financial statements.                  Ended
                                                                       Jan. 31,     For the Year Ended July 31,
Increase (Decrease) in Net Asset Value:                                  2000      1999       1998     1997      1996
<S>                 <S>                                               <C>        <C>       <C>       <C>        <C>
Per Share           Net asset value, beginning of period              $   9.55   $   9.80  $   9.66  $   9.21   $   9.16
Operating                                                             --------   --------  --------  --------   --------
Performance:        Investment income--net                                 .21        .42       .46       .47        .46
                    Realized and unrealized gain (loss) on
                    investments--net                                      (.47)      (.25)      .14       .45        .05
                                                                      --------   --------  --------  --------   --------
                    Total from investment operations                      (.26)       .17       .60       .92        .51
                                                                      --------   --------  --------  --------   --------
                    Less dividends from investment income--net            (.21)      (.42)     (.46)     (.47)      (.46)
                                                                      --------   --------  --------  --------   --------
                    Net asset value, end of period                    $   9.08   $   9.55  $   9.80  $   9.66   $   9.21
                                                                      ========   ========  ========  ========   ========

Total Investment    Based on net asset value per share                  (2.71%)++   1.67%     6.35%    10.24%      5.63%
Return:**                                                             ========   ========  ========  ========   ========

Ratios to Average   Expenses, net of reimbursement                       1.04%*     1.04%      .83%      .56%       .47%
Net Assets:                                                           ========   ========  ========  ========   ========
                    Expenses                                             1.34%*     1.36%     1.31%     1.41%      1.36%
                                                                      ========   ========  ========  ========   ========
                    Investment income--net                               4.54%*     4.25%     4.70%     5.00%      4.91%
                                                                      ========   ========  ========  ========   ========

Supplemental        Net assets, end of period (in thousands)          $  1,021   $  1,091  $  1,107  $    883   $    647
Data:                                                                 ========   ========  ========  ========   ========
                    Portfolio turnover                                  18.05%     30.98%    88.89%    94.90%     81.87%
                                                                      ========   ========  ========  ========   ========


                   *Annualized.
                  **Total investment returns exclude the effects of sales charges.
                  ++Aggregate total investment return.

                    See Notes to Financial Statements.
</TABLE>


Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


NOTES TO FINANCIAL STATEMENTS

1. Significant Accounting Policies:
Merrill Lynch Maryland 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 generally
accepted accounting principles, which may require the use of
management accruals and estimates. These unaudited financial
statements reflect all adjustments, which are, in the opinion of
management, necessary to a fair statement of the results for the
interim period presented. All such adjustments are of a normal
recurring nature. 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 strategies to seek to increase its return by hedging its
portfolio against adverse movements in the debt markets. Losses may
arise due to changes in the value of the contract or if the
counterparty does not perform under the contract.

* 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) 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.


Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


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 Merrill Lynch Funds
Distributor ("MLFD" or the "Distributor"), a division of Princeton
Funds Distributor, Inc. ("PFD"), 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.

For the six months ended January 31, 2000, FAM earned fees of
$77,853, of which $42,465 was voluntarily waived.

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
                      Maintenance    Distribution
                          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 six months ended January 31, 2000, MLFD earned underwriting
discounts and MLPF&S earned dealer concessions on sales of the
Fund's Class D Shares as follows:

                                MLFD      MLPF&S

Class D                         $ 4        $52

For the six months ended January 31, 2000, MLPF&S received
contingent deferred sales charges of $36,000 and $1,770 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, PFD, and/or ML & Co.


3. Investments:
Purchases and sales of investments, excluding short-term securities,
for the six months ended January 31, 2000 were $4,581,108 and
$4,781,070, respectively.

Net realized losses for the six months ended January 31, 2000 and
net unrealized losses as of January 31, 2000 were as follows:

                                     Realized    Unrealized
                                      Losses        Losses

Long-term investments               $ (20,839)     $(487,351)
Financial futures contracts           (28,515)            --
                                    ---------      ---------
Total                               $ (49,354)     $(487,351)
                                    =========      =========

As of January 31, 2000, net unrealized depreciation for Federal
income tax purposes aggregated $487,351, of which $397,081 was
related to appreciated securities and $884,432 was related to
depreciated securities. The aggregate cost of investments at January
31, 2000 for Federal income tax purposes was $25,895,450.


Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000


NOTES TO FINANCIAL STATEMENTS (concluded)



4. Beneficial Interest Transactions:
Net increase (decrease) in net assets derived from beneficial
interest transactions was $(4,324,807) and $2,759,849 for the six
months ended January 31, 2000 and for the year ended July 31, 1999,
respectively.

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

Class A Shares for the Six Months                   Dollar
Ended January 31, 2000                Shares        Amount

Shares sold                            14,100    $   129,758
Shares issued to shareholders
in reinvestment of dividends            3,986         36,872
                                   ----------    -----------
Total issued                           18,086        166,630
Shares redeemed                       (30,869)      (287,891)
                                   ----------    -----------
Net decrease                          (12,783)   $  (121,261)
                                   ==========    ===========

Class A Shares for the Year                         Dollar
Ended July 31, 1999                   Shares        Amount

Shares sold                            86,202    $   850,321
Shares issued to shareholders
in reinvestment of dividends            7,497         73,803
                                   ----------    -----------
Total issued                           93,699        924,124
Shares redeemed                       (87,187)      (858,231)
                                   ----------    -----------
Net increase                            6,512    $    65,893
                                   ==========    ===========

Class B Shares for the Six Months                   Dollar
Ended January 31, 2000                Shares        Amount

Shares sold                           103,041   $    960,174
Shares issued to shareholders
in reinvestment of dividends           23,351        216,097
                                   ----------    -----------
Total issued                          126,392      1,176,271
Automatic conversion of shares         (4,717)       (44,660)
Shares redeemed                      (507,635)    (4,713,427)
                                   ----------    -----------
Net decrease                         (385,960)   $(3,581,816)
                                   ==========    ===========

Class B Shares for the Year                         Dollar
Ended July 31, 1999                   Shares        Amount

Shares sold                           669,526    $ 6,623,529
Shares issued to shareholders
in reinvestment of dividends           47,928        472,323
                                   ----------    -----------
Total issued                          717,454      7,095,852
Automatic conversion of shares        (10,128)       (99,875)
Shares redeemed                      (493,512)    (4,864,156)
                                   ----------    -----------
Net increase                          213,814    $ 2,131,821
                                   ==========    ===========

Class C Shares for the Six Months                   Dollar
Ended January 31, 2000                Shares        Amount

Shares sold                            31,184     $  292,973
Shares issued to shareholders
in reinvestment of dividends            3,312         30,692
                                   ----------    -----------
Total issued                           34,496        323,665
Shares redeemed                      (100,839)      (930,261)
                                   ----------    -----------
Net decrease                          (66,343)   $  (606,596)
                                   ==========    ===========


Class C Shares for the Year                         Dollar
Ended July 31, 1999                   Shares        Amount

Shares sold                           134,939    $ 1,337,283
Shares issued to shareholders
in reinvestment of dividends            6,135         60,412
                                   ----------    -----------
Total issued                          141,074      1,397,695
Shares redeemed                       (87,531)      (854,386)
                                   ----------    -----------
Net increase                           53,543    $   543,309
                                   ==========    ===========

Class D Shares for the Six Months                   Dollar
Ended January 31, 2000                Shares        Amount

Shares sold                             5,707    $    52,823
Automatic conversion of shares          4,717         44,660
Shares issued to shareholders
in reinvestment of dividends            1,434         13,268
                                   ----------    -----------
Total issued                           11,858        110,751
Shares redeemed                       (13,592)      (125,885)
                                   ----------    -----------
Net decrease                           (1,734)   $   (15,134)
                                   ==========    ===========


Merrill Lynch Maryland Municipal Bond Fund
January 31, 2000

Class D Shares for the Year                         Dollar
Ended July 31, 1999                   Shares        Amount

Shares sold                            40,336     $  401,924
Automatic conversion of shares         10,138         99,875
Shares issued to shareholders
in reinvestment of dividends            2,986         29,407
                                   ----------    -----------
Total issued                           53,460        531,206
Shares redeemed                       (52,307)      (512,380)
                                   ----------    -----------
Net increase                            1,153    $    18,826
                                   ==========    ===========

5. Capital Loss Carryforward:
At July 31, 1999, the Fund had a net capital loss carryforward of
approximately $1,193,000, of which $415,000 expires in 2003 and
$778,000 expires in 2004. This amount will be available to offset
like amounts of any future taxable gains.


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
Kenneth A. Jacob, Vice President
Michael A. Kalinoski, Vice President
Donald C. Burke, Vice President and Treasurer
Alice A. Pellegrino, Secretary


Robert R. Martin, Trustee of Merrill Lynch Maryland Municipal Bond
Fund has recently retired. The Fund's Board of Trustees wishes Mr.
Martin well in his retirement.

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



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