SELIGMAN MUNICIPAL SERIES TRUST
NSAR-A, 1997-05-20
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<PAGE>      PAGE  1
000 A000000 03/31/97
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 10& W SELIGMAN & CO. , INCORPORATED
008 B00AA01 A
008 C00AA01 801-15798
008 D01AA01 NEW YORK
008 D02AA01 NY
008 D03AA01 10017
011 A00AA01 SELIGMAN FINANCIAL SERVICES 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
014 B00AA05 8-`
015 A00AA01 INVESTORS FIDUCIARY TRUST COMPANY
015 B00AA01 C
015 C01AA01 KANSAS CITY
015 C02AA01 MO
015 C03AA01 64105
015 C04AA01 1716
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   48
019 C00AA00 JWSELIGMAN
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020 C000002      0
020 C000003      0
020 C000004      0
020 C000005      0
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000        0
022 A000001 LEHMAN BROTHERS, INC.
022 B000001 13-2518466
022 C000001     22633
022 D000001     26840
022 A000002 A.F. BEST SECURITIES INC.
022 B000002 59-2325576
022 C000002      7615
022 D000002      2366
022 A000003 SMITH BARNEY INC.
022 B000003 13-1912900
022 C000003      1900
022 D000003      6412
022 A000004 GOLDMAN SACHS & CO.
022 B000004 13-5108880
022 C000004      4421
022 D000004       800
022 A000005 MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
<PAGE>      PAGE  3
022 B000005 13-5674085
022 C000005      4764
022 D000005         0
022 A000006 BEAR STEARNS & CO., INC.
022 B000006 13-3299429
022 C000006      2865
022 D000006      1433
022 A000007 MORGAN (J.P.) SECURITIES INC.
022 B000007 13-3224016
022 C000007      1491
022 D000007      2346
022 A000008 DILLON READ & CO., INC.
022 B000008 13-1939216
022 C000008         0
022 D000008      3068
022 A000009 PRUDENTIAL SECURITIES INC.
022 B000009 22-2347336
022 C000009         0
022 D000009      2953
022 A000010 FIRST OF AMERICA SECURITIES, INC.
022 B000010 04-2785576
022 C000010         0
022 D000010      2362
023 C000000      47914
023 D000000      60618
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<PAGE>      PAGE  4
054 H00AA00 Y
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054 K00AA00 N
054 L00AA00 N
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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070 I020100 N
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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036 A000200 N
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037  000200 N
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039  000200 N
040  000200 Y
041  000200 Y
<PAGE>      PAGE  10
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050  000200 N
051  000200 N
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056  000200 Y
057  000200 N
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<PAGE>      PAGE  11
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070 A010200 Y
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070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
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070 I010200 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
051  000400 N
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<PAGE>      PAGE  17
070 L010400 N
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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030 B000500  4.75
030 B000500  0.00
030 B000500  4.75
030 C000500  0.00
030 C000500  0.00
030 C000500  0.00
031 A000500      7
031 B000500      0
032  000500     51
033  000500      1
034  000500 Y
035  000500      0
036 A000500 N
036 B000500      0
037  000500 N
038  000500      0
039  000500 N
040  000500 Y
041  000500 Y
042 A000500   0
042 B000500   0
042 C000500   0
042 D000500 100
042 E000500   0
042 F000500   0
042 G000500   0
042 H000500   0
043  000500     62
044  000500      0
045  000500 Y
046  000500 N
047  000500 Y
048  000500  0.500
048 A010500        0
<PAGE>      PAGE  20
048 A020500 0.000
048 B010500        0
048 B020500 0.000
048 C010500        0
048 C020500 0.000
048 D010500        0
048 D020500 0.000
048 E010500        0
048 E020500 0.000
048 F010500        0
048 F020500 0.000
048 G010500        0
048 G020500 0.000
048 H010500        0
048 H020500 0.000
048 I010500        0
048 I020500 0.000
048 J010500        0
048 J020500 0.000
048 K010500        0
048 K020500 0.000
049  000500 N
050  000500 N
051  000500 N
052  000500 N
053 A000500 N
055 A000500 Y
055 B000500 N
056  000500 Y
057  000500 N
062 A000500 Y
062 B000500   0.0
062 C000500   0.0
062 D000500   0.0
062 E000500   0.4
062 F000500   0.0
062 G000500   0.0
062 H000500   0.0
062 I000500   0.0
062 J000500   0.0
062 K000500   0.0
062 L000500   2.4
062 M000500   0.0
062 N000500   0.0
062 O000500  97.2
062 P000500   0.0
062 Q000500   0.0
062 R000500   0.0
063 A000500   0
063 B000500 23.1
064 A000500 Y
<PAGE>      PAGE  21
064 B000500 N
070 A010500 Y
070 A020500 N
070 B010500 N
070 B020500 N
070 C010500 N
070 C020500 N
070 D010500 N
070 D020500 N
070 E010500 N
070 E020500 N
070 F010500 N
070 F020500 N
070 G010500 N
070 G020500 N
070 H010500 N
070 H020500 N
070 I010500 N
070 I020500 N
070 J010500 Y
070 J020500 N
070 K010500 N
070 K020500 N
070 L010500 N
070 L020500 N
070 M010500 N
070 M020500 N
070 N010500 N
070 N020500 N
070 O010500 N
070 O020500 N
070 P010500 Y
070 P020500 Y
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
071 A000500      5879
071 B000500      6218
071 C000500     45509
071 D000500   13
072 A000500  6
072 B000500     1344
072 C000500        0
072 D000500        0
072 E000500        0
072 F000500      116
072 G000500        0
072 H000500        0
072 I000500       32
072 J000500        9
<PAGE>      PAGE  22
072 K000500        1
072 L000500        4
072 M000500        4
072 N000500        1
072 O000500        0
072 P000500        0
072 Q000500        0
072 R000500        8
072 S000500        4
072 T000500       62
072 U000500        0
072 V000500        3
072 W000500        1
072 X000500      245
072 Y000500        0
072 Z000500     1099
072AA000500      148
072BB000500        6
072CC010500        0
072CC020500      891
072DD010500     1067
072DD020500       32
072EE000500      632
073 A010500   0.1799
073 A020500   0.1510
073 B000500   0.1030
073 C000500   0.0000
074 A000500      240
074 B000500        0
074 C000500      200
074 D000500    43877
074 E000500        0
074 F000500        0
074 G000500        0
074 H000500        0
074 I000500        0
074 J000500        0
074 K000500        7
074 L000500     1007
074 M000500        7
074 N000500    45338
074 O000500        0
074 P000500       23
074 Q000500        0
074 R010500        0
074 R020500        0
074 R030500        0
074 R040500      171
074 S000500        0
074 T000500    45144
074 U010500     5833
<PAGE>      PAGE  23
074 U020500      231
074 V010500     7.44
074 V020500     7.46
074 W000500   0.0000
074 X000500      854
074 Y000500        0
075 A000500        0
075 B000500    46707
076  000500     0.00
SIGNATURE   THOMAS G. ROSE                               
TITLE       TREASUER            
 


<TABLE> <S> <C>

<ARTICLE> 6
<SERIES>
        <NUMBER>011          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-CALIFORNA QUALITY CL A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1997
<INVESTMENTS-AT-COST>                            85181
<INVESTMENTS-AT-VALUE>                           87856
<RECEIVABLES>                                     1451 
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   89307
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          649
<TOTAL-LIABILITIES>                                649
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         86012
<SHARES-COMMON-STOCK>                            13038<F1>
<SHARES-COMMON-PRIOR>                            14159<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (29)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          2675
<NET-ASSETS>                                     87463<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 2723<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   (378)<F1>
<NET-INVESTMENT-INCOME>                           2345<F1>
<REALIZED-GAINS-CURRENT>                           201
<APPREC-INCREASE-CURRENT>                        (642)
<NET-CHANGE-FROM-OPS>                             1935
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (2345)<F1>
<DISTRIBUTIONS-OF-GAINS>                          (28)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1609<F1>
<NUMBER-OF-SHARES-REDEEMED>                     (2900)<F1>
<SHARES-REINVESTED>                                170<F1>
<NET-CHANGE-IN-ASSETS>                          (8547)   
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        (202)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              232<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    378<F1>
<AVERAGE-NET-ASSETS>                             92967<F1>
<PER-SHARE-NAV-BEGIN>                             6.75<F1>
<PER-SHARE-NII>                                    .17<F1>
<PER-SHARE-GAIN-APPREC>                          (.04)<F1>
<PER-SHARE-DIVIDEND>                             (.17)<F1>
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.71<F1>
<EXPENSE-RATIO>                                    .81<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>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1997
<INVESTMENTS-AT-COST>                            85181
<INVESTMENTS-AT-VALUE>                           87856
<RECEIVABLES>                                     1451 
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   89307
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          649
<TOTAL-LIABILITIES>                                649
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         86012
<SHARES-COMMON-STOCK>                              178<F1>
<SHARES-COMMON-PRIOR>                              244<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (29)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          2675
<NET-ASSETS>                                      1195<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                   43<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    (12)<F1>
<NET-INVESTMENT-INCOME>                             31<F1>
<REALIZED-GAINS-CURRENT>                           201
<APPREC-INCREASE-CURRENT>                        (642)
<NET-CHANGE-FROM-OPS>                             1935
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (31)<F1>
<DISTRIBUTIONS-OF-GAINS>                             0<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            385<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (454)<F1>
<SHARES-REINVESTED>                                  3<F1>
<NET-CHANGE-IN-ASSETS>                          (8547)   
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        (202)
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                4<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     12<F1>
<AVERAGE-NET-ASSETS>                              1506<F1>
<PER-SHARE-NAV-BEGIN>                             6.74<F1>
<PER-SHARE-NII>                                    .14<F1>
<PER-SHARE-GAIN-APPREC>                          (.05)<F1>
<PER-SHARE-DIVIDEND>                             (.14)<F1>
<PER-SHARE-DISTRIBUTIONS>                            0<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.69<F1>
<EXPENSE-RATIO>                                   1.72<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>021          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-CALIFORNA HIGH-YIELD CL A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1997
<INVESTMENTS-AT-COST>                            50211
<INVESTMENTS-AT-VALUE>                           51371
<RECEIVABLES>                                     1080
<ASSETS-OTHER>                                     116
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   52567
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          228
<TOTAL-LIABILITIES>                                228
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         51242
<SHARES-COMMON-STOCK>                             7913<F1>
<SHARES-COMMON-PRIOR>                             7735<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (63) 
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          1160
<NET-ASSETS>                                     50311<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 1563<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   (217)<F1>
<NET-INVESTMENT-INCOME>                           1346<F1>
<REALIZED-GAINS-CURRENT>                            30
<APPREC-INCREASE-CURRENT>                        (411)
<NET-CHANGE-FROM-OPS>                             1008
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1346)<F1>
<DISTRIBUTIONS-OF-GAINS>                         (722)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            759<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (765)<F1>
<SHARES-REINVESTED>                                184<F1>
<NET-CHANGE-IN-ASSETS>                             155   
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          656
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              126<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    217<F1>
<AVERAGE-NET-ASSETS>                             50441<F1>
<PER-SHARE-NAV-BEGIN>                             6.50<F1>
<PER-SHARE-NII>                                    .17<F1>
<PER-SHARE-GAIN-APPREC>                          (.05)<F1>
<PER-SHARE-DIVIDEND>                             (.17)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.09)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.36<F1>
<EXPENSE-RATIO>                                    .86<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>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1997
<INVESTMENTS-AT-COST>                            50211
<INVESTMENTS-AT-VALUE>                           51371
<RECEIVABLES>                                     1080
<ASSETS-OTHER>                                     116
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   52567
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          228
<TOTAL-LIABILITIES>                                228
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         51242
<SHARES-COMMON-STOCK>                              318<F1>
<SHARES-COMMON-PRIOR>                              295<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (63) 
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          1160
<NET-ASSETS>                                      2028<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                   60<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    (17)<F1>
<NET-INVESTMENT-INCOME>                             43<F1>
<REALIZED-GAINS-CURRENT>                            30
<APPREC-INCREASE-CURRENT>                        (411)
<NET-CHANGE-FROM-OPS>                             1008
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (43)<F1>
<DISTRIBUTIONS-OF-GAINS>                          (27)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             98<F1>
<NUMBER-OF-SHARES-REDEEMED>                       (83)<F1>
<SHARES-REINVESTED>                                  8<F1>
<NET-CHANGE-IN-ASSETS>                             155   
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          656
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                4<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     17<F1>
<AVERAGE-NET-ASSETS>                              1961<F1>
<PER-SHARE-NAV-BEGIN>                             6.51<F1>
<PER-SHARE-NII>                                    .14<F1>
<PER-SHARE-GAIN-APPREC>                          (.05)<F1>
<PER-SHARE-DIVIDEND>                             (.14)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.09)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.37<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>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1997
<INVESTMENTS-AT-COST>                            33594
<INVESTMENTS-AT-VALUE>                           34261
<RECEIVABLES>                                      595
<ASSETS-OTHER>                                      88  
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   34944
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          300
<TOTAL-LIABILITIES>                                300
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         34003
<SHARES-COMMON-STOCK>                             4305<F1>
<SHARES-COMMON-PRIOR>                             4584<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (26)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                           667
<NET-ASSETS>                                     33416<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 1013<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   (186)<F1>
<NET-INVESTMENT-INCOME>                            827<F1>
<REALIZED-GAINS-CURRENT>                          (24)
<APPREC-INCREASE-CURRENT>                        (157)
<NET-CHANGE-FROM-OPS>                              669
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (827)<F1>
<DISTRIBUTIONS-OF-GAINS>                         (145)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            144<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (492)<F1>
<SHARES-REINVESTED>                                 69<F1>
<NET-CHANGE-IN-ASSETS>                          (2522)  
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          148
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               87<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    186<F1>
<AVERAGE-NET-ASSETS>                             35058<F1>
<PER-SHARE-NAV-BEGIN>                             7.84<F1>
<PER-SHARE-NII>                                    .19<F1>
<PER-SHARE-GAIN-APPREC>                          (.05)<F1>
<PER-SHARE-DIVIDEND>                             (.19)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.03)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.76<F1>
<EXPENSE-RATIO>                                   1.07<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>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1997
<INVESTMENTS-AT-COST>                            33594
<INVESTMENTS-AT-VALUE>                           34261
<RECEIVABLES>                                      595
<ASSETS-OTHER>                                      88  
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   34944
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          300
<TOTAL-LIABILITIES>                                300
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         34003
<SHARES-COMMON-STOCK>                              158<F1>
<SHARES-COMMON-PRIOR>                              157<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (26)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                           667
<NET-ASSETS>                                      1228<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                   34<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    (11)<F1>
<NET-INVESTMENT-INCOME>                             23<F1>
<REALIZED-GAINS-CURRENT>                          (24)
<APPREC-INCREASE-CURRENT>                        (157)
<NET-CHANGE-FROM-OPS>                              669
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (23)<F1>
<DISTRIBUTIONS-OF-GAINS>                           (5)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                              9<F1>
<NUMBER-OF-SHARES-REDEEMED>                       (11)<F1>
<SHARES-REINVESTED>                                  3<F1>
<NET-CHANGE-IN-ASSETS>                          (2522)  
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          148
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                3<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     11<F1>
<AVERAGE-NET-ASSETS>                              1191<F1>
<PER-SHARE-NAV-BEGIN>                             7.83<F1>
<PER-SHARE-NII>                                    .16<F1>
<PER-SHARE-GAIN-APPREC>                          (.04)<F1>
<PER-SHARE-DIVIDEND>                             (.16)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.03)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.76<F1>
<EXPENSE-RATIO>                                   1.83<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>051          
        <NAME> SELIGMAN MUNICIPAL SERIES TRUST-FLORIDA CL A
<MULTIPLIER> 1000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1997
<INVESTMENTS-AT-COST>                            44282
<INVESTMENTS-AT-VALUE>                           44077
<RECEIVABLES>                                     1021 
<ASSETS-OTHER>                                     240
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   45338
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          194
<TOTAL-LIABILITIES>                                194
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         45209
<SHARES-COMMON-STOCK>                             5833<F1>
<SHARES-COMMON-PRIOR>                             5894<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            140
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         (205)
<NET-ASSETS>                                     43423<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                 1298<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   (231)<F1>
<NET-INVESTMENT-INCOME>                           1067<F1>
<REALIZED-GAINS-CURRENT>                           142
<APPREC-INCREASE-CURRENT>                        (891)
<NET-CHANGE-FROM-OPS>                              350
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1067)<F1>
<DISTRIBUTIONS-OF-GAINS>                         (612)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            399<F1>
<NUMBER-OF-SHARES-REDEEMED>                      (560)<F1>
<SHARES-REINVESTED>                                100<F1>
<NET-CHANGE-IN-ASSETS>                          (1333)  
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          630
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              112<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    231<F1>
<AVERAGE-NET-ASSETS>                             45121<F1>
<PER-SHARE-NAV-BEGIN>                             7.67<F1>
<PER-SHARE-NII>                                    .18<F1>
<PER-SHARE-GAIN-APPREC>                          (.13)<F1>
<PER-SHARE-DIVIDEND>                             (.18)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.10)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.44<F1>
<EXPENSE-RATIO>                                   1.02<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>                   6-MOS
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               MAR-31-1997
<INVESTMENTS-AT-COST>                            44282
<INVESTMENTS-AT-VALUE>                           44077
<RECEIVABLES>                                     1021 
<ASSETS-OTHER>                                     240
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                   45338
<PAYABLE-FOR-SECURITIES>                             0   
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                          194
<TOTAL-LIABILITIES>                                194
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         45209
<SHARES-COMMON-STOCK>                              231<F1>
<SHARES-COMMON-PRIOR>                              166<F1>
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            140
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         (205)
<NET-ASSETS>                                      1721<F1>
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                   46<F1>
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    (14)<F1>
<NET-INVESTMENT-INCOME>                             32<F1>
<REALIZED-GAINS-CURRENT>                           142
<APPREC-INCREASE-CURRENT>                        (891)
<NET-CHANGE-FROM-OPS>                              350
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         (32)<F1>
<DISTRIBUTIONS-OF-GAINS>                          (20)<F1>
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                             72<F1>
<NUMBER-OF-SHARES-REDEEMED>                       (12)<F1>
<SHARES-REINVESTED>                                  5<F1>
<NET-CHANGE-IN-ASSETS>                          (1333)  
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          630
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                                4<F1>
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     14<F1>
<AVERAGE-NET-ASSETS>                              1586<F1>
<PER-SHARE-NAV-BEGIN>                             7.68<F1>
<PER-SHARE-NII>                                    .15<F1>
<PER-SHARE-GAIN-APPREC>                          (.12)<F1>
<PER-SHARE-DIVIDEND>                             (.15)<F1>
<PER-SHARE-DISTRIBUTIONS>                        (.10)<F1>
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.46<F1>
<EXPENSE-RATIO>                                   1.78<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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