SELIGMAN MUNICIPAL SERIES TRUST
NSAR-B, 1998-11-25
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<PAGE>      PAGE  1
000 B000000 09/30/98
000 C000000 750756
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 SELIGMAN MUNICIPAL SERIES TRUST
001 B000000 811-4250
001 C000000 2128501864
002 A000000 100 PARK AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10017
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  4
007 C010100  1
007 C020100 CALIFORNIA QUALITY SERIES
007 C030100 N
007 C010200  2
007 C020200 CALIFORNIA HIGH-YIELD SERIES
007 C030200 N
007 C010300  3
007 C010400  4
007 C020400 NORTH CAROLINA SERIES
007 C030400 N
007 C010500  5
007 C020500 FLORIDA SERIES
007 C030500 N
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 J. & W. SELIGMAN & CO., INCORPORATED
008 B00AA01 A
008 C00AA01 801-15798
008 D01AA01 NEW YORK
008 D02AA01 NY
008 D03AA01 10017
011 A00AA01 SELIGMAN ADVISORS, INC.
011 B00AA01 8-25845
011 C01AA01 NEW YORK
011 C02AA01 NY
011 C03AA01 10017
<PAGE>      PAGE  2
012 A00AA01 SELIGMAN DATA CORP.
012 B00AA01 85-1895
012 C01AA01 NEW YORK
012 C02AA01 NY
012 C03AA01 10017
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 NEW YORK
013 B02AA01 NY
013 B03AA01 10281
014 A00AA01 SELIGMAN SERVICES, INC.
014 B00AA01 8-47717
015 A00AA01 INVESTORS FIDUCIARY TRUST COMPANY
015 B00AA01 C
015 C01AA01 KANSAS CITY
015 C02AA01 MO
015 C03AA01 64105
015 C04AA01 1307
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   52
019 C00AA00 JWSELIGMAN
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020 C000006      0
020 C000007      0
020 C000008      0
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021  000000        0
022 A000001 LEHMAN BROTHERS, INC.
022 B000001 13-2518466
022 C000001     37343
022 D000001     41796
022 A000002 SMITH BARNEY INC.
022 B000002 13-1912900
022 C000002     10561
022 D000002      8787
022 A000003 GOLDMAN SACHS & CO.
022 B000003 13-5108880
022 C000003      7593
022 D000003      9333
022 A000004 A.F. BEST SECURITIES INC.
022 B000004 59-2325576
022 C000004      9458
022 D000004      6817
022 A000005 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
022 B000005 13-5674085
<PAGE>      PAGE  3
022 C000005      5269
022 D000005      4272
022 A000006 BEAR STEARNS & CO., INC.
022 B000006 13-3299429
022 C000006      2905
022 D000006      3557
022 A000007 FIRST CHICAGO CAPITAL MARKETS
022 B000007 36-3595942
022 C000007      3200
022 D000007      2500
022 A000008 MORGAN STANLEY DEAN WITTER
022 B000008 94-1671384
022 C000008      4430
022 D000008       865
022 A000009 BANCAMERICA SECURITIES, INC.
022 B000009 95-4035346
022 C000009      3975
022 D000009       527
022 A000010 PRUDENTIAL SECURITIES INCORPORATED
022 B000010 22-2347336
022 C000010         0
022 D000010      4287
023 C000000      97113
023 D000000      94577
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<PAGE>      PAGE  4
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054 E00AA00 N
054 F00AA00 N
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054 H00AA00 Y
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054 L00AA00 N
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<PAGE>      PAGE  5
068 B00AA00 N
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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070 F010100 N
070 F020100 N
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070 K010100 N
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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<PAGE>      PAGE  11
063 A000200   0
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070 F010200 N
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070 H010200 N
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070 I010200 N
070 I020200 N
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070 K010200 N
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070 L010200 N
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<PAGE>      PAGE  12
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<PAGE>      PAGE  13
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
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<PAGE>      PAGE  17
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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072 M000500        5
072 N000500        7
072 O000500        1
072 P000500        0
072 Q000500        0
072 R000500       19
072 S000500        7
072 T000500      118
072 U000500        0
072 V000500        0
072 W000500        1
072 X000500      458
072 Y000500        0
072 Z000500     1955
072AA000500      283
072BB000500        0
072CC010500     1624
072CC020500        0
072DD010500     1887
072DD020500       68
072EE000500      401
073 A010500   0.3510
073 A020500   0.2906
073 B000500   0.0720
073 C000500   0.0000
074 A000500      109
074 B000500        0
074 C000500      200
074 D000500    43321
<PAGE>      PAGE  20
074 E000500        0
074 F000500        0
074 G000500        0
074 H000500        0
074 I000500        0
074 J000500       56
074 K000500        5
074 L000500      881
074 M000500        1
074 N000500    44573
074 O000500        0
074 P000500       22
074 Q000500        0
074 R010500        0
074 R020500        0
074 R030500        0
074 R040500      147
074 S000500        0
074 T000500    44404
074 U010500     5265
074 U020500      240
074 V010500     8.07
074 V020500     8.08
074 W000500   0.0000
074 X000500      765
074 Y000500        0
075 A000500        0
075 B000500    44154
076  000500     0.00
SIGNATURE   THOMAS G. ROSE                               
TITLE       TREASURER           
 


<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
        <NUMBER>021          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-CALIFORNA HIGH-YIELD CL A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                            59275
<INVESTMENTS-AT-VALUE>                           64020
<RECEIVABLES>                                      971
<ASSETS-OTHER>                                      79
<OTHER-ITEMS-ASSETS>                                 1
<TOTAL-ASSETS>                                   65071
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          304
<TOTAL-LIABILITIES>                                304
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         59860
<SHARES-COMMON-STOCK>                             8590<F1>
<SHARES-COMMON-PRIOR>                             8005<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            162
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          4745
<NET-ASSETS>                                     58374<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 3127<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   (455)<F1>
<NET-INVESTMENT-INCOME>                           2672<F1>
<REALIZED-GAINS-CURRENT>                           316
<APPREC-INCREASE-CURRENT>                         1697
<NET-CHANGE-FROM-OPS>                             4882
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (2672)<F1>
<DISTRIBUTIONS-OF-GAINS>                         (255)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1690<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (1343)<F1>
<SHARES-REINVESTED>                                238<F1>
<NET-CHANGE-IN-ASSETS>                            8564   
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          118
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              278<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    455<F1>
<AVERAGE-NET-ASSETS>                             55547<F1>
<PER-SHARE-NAV-BEGIN>                             6.61<F1>
<PER-SHARE-NII>                                    .32<F1>
<PER-SHARE-GAIN-APPREC>                            .22<F1>
<PER-SHARE-DIVIDEND>                             (.32)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.03)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.80<F1>
<EXPENSE-RATIO>                                    .82<F1>
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
        



</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
        <NUMBER>024          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-CALIFORNA HIGH-YIELD CL D
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                            59275
<INVESTMENTS-AT-VALUE>                           64020
<RECEIVABLES>                                      971
<ASSETS-OTHER>                                      79
<OTHER-ITEMS-ASSETS>                                 1
<TOTAL-ASSETS>                                   65071
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          304
<TOTAL-LIABILITIES>                                304
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         59860
<SHARES-COMMON-STOCK>                              940<F1>
<SHARES-COMMON-PRIOR>                              502<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            162
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          4745
<NET-ASSETS>                                      6393<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                  284<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    (87)<F1>
<NET-INVESTMENT-INCOME>                            197<F1>
<REALIZED-GAINS-CURRENT>                           316
<APPREC-INCREASE-CURRENT>                         1697
<NET-CHANGE-FROM-OPS>                             4882
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (197)<F1>
<DISTRIBUTIONS-OF-GAINS>                          (17)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            582<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (168)<F1>
<SHARES-REINVESTED>                                 24<F1>
<NET-CHANGE-IN-ASSETS>                            8564   
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          118
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               25<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     87<F1>
<AVERAGE-NET-ASSETS>                              5062<F1>
<PER-SHARE-NAV-BEGIN>                             6.61<F1>
<PER-SHARE-NII>                                    .26<F1>
<PER-SHARE-GAIN-APPREC>                            .22<F1>
<PER-SHARE-DIVIDEND>                             (.26)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.03)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.80<F1>
<EXPENSE-RATIO>                                   1.73<F1>
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
        



</TABLE>

<TABLE> <S> <C>


<ARTICLE> 6
<SERIES>
        <NUMBER>011          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-CALIFORNA QUALITY CL A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                  12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                            82151
<INVESTMENTS-AT-VALUE>                           88733
<RECEIVABLES>                                     1404 
<ASSETS-OTHER>                                     148
<OTHER-ITEMS-ASSETS>                                 1
<TOTAL-ASSETS>                                   90286
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          462
<TOTAL-LIABILITIES>                                462
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         80762
<SHARES-COMMON-STOCK>                            12142<F1>
<SHARES-COMMON-PRIOR>                            12445<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           2480
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          6582
<NET-ASSETS>                                     87522<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 4781<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   (669)<F1>
<NET-INVESTMENT-INCOME>                           4112<F1>
<REALIZED-GAINS-CURRENT>                          2703
<APPREC-INCREASE-CURRENT>                          430
<NET-CHANGE-FROM-OPS>                             7321
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (4112)<F1>
<DISTRIBUTIONS-OF-GAINS>                         (411)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1748<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (2381)<F1>
<SHARES-REINVESTED>                                330<F1>
<NET-CHANGE-IN-ASSETS>                            1155
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          197
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              433<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    669<F1>
<AVERAGE-NET-ASSETS>                             86593<F1>
<PER-SHARE-NAV-BEGIN>                             6.99<F1>
<PER-SHARE-NII>                                    .33<F1>
<PER-SHARE-GAIN-APPREC>                            .25<F1>
<PER-SHARE-DIVIDEND>                             (.33)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.03)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.21<F1>
<EXPENSE-RATIO>                                    .77<F1>
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
        



</TABLE>

<TABLE> <S> <C>


<ARTICLE> 6
<SERIES>
        <NUMBER>014          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-CALIFORNA QUALITY CL D
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                  12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                            82151
<INVESTMENTS-AT-VALUE>                           88733
<RECEIVABLES>                                     1404 
<ASSETS-OTHER>                                     148
<OTHER-ITEMS-ASSETS>                                 1
<TOTAL-ASSETS>                                   90286
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          462
<TOTAL-LIABILITIES>                                462
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         80762
<SHARES-COMMON-STOCK>                              320<F1>
<SHARES-COMMON-PRIOR>                              240<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           2480
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          6582
<NET-ASSETS>                                      2302<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                  109<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    (33)<F1>
<NET-INVESTMENT-INCOME>                             76<F1>
<REALIZED-GAINS-CURRENT>                          2703
<APPREC-INCREASE-CURRENT>                          430
<NET-CHANGE-FROM-OPS>                             7321
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (76)<F1>
<DISTRIBUTIONS-OF-GAINS>                           (9)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            380<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (307)<F1>
<SHARES-REINVESTED>                                  7<F1>
<NET-CHANGE-IN-ASSETS>                            1155
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          197
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               10<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     33<F1>
<AVERAGE-NET-ASSETS>                              1966<F1>
<PER-SHARE-NAV-BEGIN>                             6.97<F1>
<PER-SHARE-NII>                                    .27<F1>
<PER-SHARE-GAIN-APPREC>                            .25<F1>
<PER-SHARE-DIVIDEND>                             (.27)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.03)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.19<F1>
<EXPENSE-RATIO>                                   1.68<F1>
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
        



</TABLE>

INDEPENDENT AUDITORS' REPORT

The Board of Trustees
Seligman Municipal Series Trust

In planning and  performing  our audit of the  financial  statements of Seligman
Municipal  Series Trust (the  "Company")  (including the California  High Yield,
California  Quality,  Florida  and North  Carolina  Series)  for the year  ended
September  30, 1998 (on which we have issued our report dated October 30, 1998),
we  considered  its  internal   control,   including   control   activities  for
safeguarding  securities,  in order to determine our auditing procedures for the
purpose of expressing our opinion on the financial statements and to comply with
the  requirements of Form N-SAR,  and not to provide  assurance on the Company's
internal control.  The management of the Company is responsible for establishing
and maintaining internal control. In fulfilling this  responsibility,  estimates
and  judgments by  management  are required to assess the expected  benefits and
related  costs of controls.  Generally,  controls  that are relevant to an audit
pertain to the entity's objective of preparing financial statements for external
purposes  that are  fairly  presented  in  conformity  with  generally  accepted
accounting principles. Those controls include the safeguarding of assets against
unauthorized acquisition,  use, or disposition.  Because of inherent limitations
in  internal  control,  errors or fraud may  occur  and not be  detected.  Also,
projection of any evaluation of internal control to future periods is subject to
the risk that it may be become  inadequate  because of changes in  conditions or
that  the  effectiveness  of the  design  and  operation  may  deteriorate.  Our
consideration of the Company's  internal control would not necessarily  disclose
all  matters  in  internal  control  that  might be  material  weaknesses  under
standards established by the American Institute of Certified Public Accountants.
A material  weakness is a condition  in which the design or  operation of one or
more of the internal  control  components  does not reduce to a  relatively  low
level the risk  that  errors  or fraud in  amounts  that  would be  material  in
relation to the financial statements being audited may occur and not be detected
within a timely  period by employees in the normal  course of  performing  their
assigned  functions.  However,  we  noted no  matters  involving  the  Company's
internal  control  and  its  operation,   including  controls  for  safeguarding
securities,  that we consider to be material  weaknesses  as defined above as of
September 30, 1998.  This report is intended  solely for the information and use
of management, the Board of Trustees of Seligman Municipal Series Trust, and the
Securities Exchange Commission.


October 30, 1998
/S/ DELOITTE & TOUCHE,  LLP
- ---------------------------

<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
        <NUMBER>051          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-FLORIDA CL A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                  12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                            40311
<INVESTMENTS-AT-VALUE>                           43521
<RECEIVABLES>                                      942 
<ASSETS-OTHER>                                     109
<OTHER-ITEMS-ASSETS>                                 1
<TOTAL-ASSETS>                                   44573
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          169
<TOTAL-LIABILITIES>                                169
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         40912
<SHARES-COMMON-STOCK>                             5265<F1>
<SHARES-COMMON-PRIOR>                             5390<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            282
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          3210
<NET-ASSETS>                                     42464<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 2313<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   (426)<F1>
<NET-INVESTMENT-INCOME>                           1887<F1>
<REALIZED-GAINS-CURRENT>                           283
<APPREC-INCREASE-CURRENT>                         1624
<NET-CHANGE-FROM-OPS>                             3862
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1887)<F1>
<DISTRIBUTIONS-OF-GAINS>                         (385)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            469<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (717)<F1>
<SHARES-REINVESTED>                                123<F1>
<NET-CHANGE-IN-ASSETS>                             701  
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          400
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              212<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    426<F1>
<AVERAGE-NET-ASSETS>                             42396<F1>
<PER-SHARE-NAV-BEGIN>                             7.80<F1>
<PER-SHARE-NII>                                    .35<F1>
<PER-SHARE-GAIN-APPREC>                            .34<F1>
<PER-SHARE-DIVIDEND>                             (.35)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.07)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               8.07<F1>
<EXPENSE-RATIO>                                   1.00<F1>
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
        





</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
        <NUMBER>054          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-FLORIDA CL D
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                  12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                            40311
<INVESTMENTS-AT-VALUE>                           43521
<RECEIVABLES>                                      942 
<ASSETS-OTHER>                                     109
<OTHER-ITEMS-ASSETS>                                 1
<TOTAL-ASSETS>                                   44573
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          169
<TOTAL-LIABILITIES>                                169
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         40912
<SHARES-COMMON-STOCK>                              240<F1>
<SHARES-COMMON-PRIOR>                              215<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            282
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          3210
<NET-ASSETS>                                      1940<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                  100<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    (32)<F1>
<NET-INVESTMENT-INCOME>                             68<F1>
<REALIZED-GAINS-CURRENT>                           283
<APPREC-INCREASE-CURRENT>                         1624
<NET-CHANGE-FROM-OPS>                             3862
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (68)<F1>
<DISTRIBUTIONS-OF-GAINS>                          (16)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            101<F1>
<NUMBER-OF-SHARES-REDEEMED>                       (83)<F1>
<SHARES-REINVESTED>                                  7<F1>
<NET-CHANGE-IN-ASSETS>                             701  
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          400
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                9<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     32<F1>
<AVERAGE-NET-ASSETS>                              1830<F1>
<PER-SHARE-NAV-BEGIN>                             7.81<F1>
<PER-SHARE-NII>                                    .29<F1>
<PER-SHARE-GAIN-APPREC>                            .34<F1>
<PER-SHARE-DIVIDEND>                             (.29)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.07)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               8.08<F1>
<EXPENSE-RATIO>                                   1.77<F1>
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
        





</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
        <NUMBER>041          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-NORTH CAROLINA CL A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                  12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                            30769
<INVESTMENTS-AT-VALUE>                           33219
<RECEIVABLES>                                      590
<ASSETS-OTHER>                                     124  
<OTHER-ITEMS-ASSETS>                                 1
<TOTAL-ASSETS>                                   33934
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          120
<TOTAL-LIABILITIES>                                120
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         30898
<SHARES-COMMON-STOCK>                             3898<F1>
<SHARES-COMMON-PRIOR>                             4061<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            466
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          2450
<NET-ASSETS>                                     32358<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 1771<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   (342)<F1>
<NET-INVESTMENT-INCOME>                           1429<F1>
<REALIZED-GAINS-CURRENT>                           472
<APPREC-INCREASE-CURRENT>                          829
<NET-CHANGE-FROM-OPS>                             2776
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1429)<F1>
<DISTRIBUTIONS-OF-GAINS>                         (259)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            269<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (548)<F1>
<SHARES-REINVESTED>                                116<F1>
<NET-CHANGE-IN-ASSETS>                            (87)  
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          263
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              162<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    342<F1>
<AVERAGE-NET-ASSETS>                             32411<F1>
<PER-SHARE-NAV-BEGIN>                             8.05<F1>
<PER-SHARE-NII>                                    .36<F1>
<PER-SHARE-GAIN-APPREC>                            .31<F1>
<PER-SHARE-DIVIDEND>                             (.36)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.06)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               8.30<F1>
<EXPENSE-RATIO>                                   1.05<F1>
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
        



</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
        <NUMBER>044          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-NORTH CAROLINA CL D
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                  12-MOS
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-END>                               SEP-30-1998
<INVESTMENTS-AT-COST>                            30769
<INVESTMENTS-AT-VALUE>                           33219
<RECEIVABLES>                                      590
<ASSETS-OTHER>                                     124  
<OTHER-ITEMS-ASSETS>                                 1
<TOTAL-ASSETS>                                   33934
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          120
<TOTAL-LIABILITIES>                                120
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         30898
<SHARES-COMMON-STOCK>                              176<F1>
<SHARES-COMMON-PRIOR>                              151<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            466
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          2450
<NET-ASSETS>                                      1456<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                   69<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    (23)<F1>
<NET-INVESTMENT-INCOME>                             46<F1>
<REALIZED-GAINS-CURRENT>                           472
<APPREC-INCREASE-CURRENT>                          829
<NET-CHANGE-FROM-OPS>                             2776
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (46)<F1>
<DISTRIBUTIONS-OF-GAINS>                          (10)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             52<F1>
<NUMBER-OF-SHARES-REDEEMED>                       (32)<F1>
<SHARES-REINVESTED>                                  5<F1>
<NET-CHANGE-IN-ASSETS>                            (87)  
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          263
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                6<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     23<F1>
<AVERAGE-NET-ASSETS>                              1266<F1>
<PER-SHARE-NAV-BEGIN>                             8.05<F1>
<PER-SHARE-NII>                                    .30<F1>
<PER-SHARE-GAIN-APPREC>                            .31<F1>
<PER-SHARE-DIVIDEND>                             (.30)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.06)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               8.30<F1>
<EXPENSE-RATIO>                                   1.82<F1>
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
        



</TABLE>


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