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011 B000001 8-25845
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012 A000001 UNION DATA SERVICE CENTER, INC.
012 B000001 84-1895
012 C010001 NEW YORK
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012 C030001 10017
013 A000001 DELOITTE & TOUCHE
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013 B020001 NY
<PAGE> PAGE 2
013 B030001 10048
014 A000001 SELIGMAN SECURITIES, INC.
014 B000001 8-26115
015 A000001 INVESTORS FIDUCIARY TRUST COMPANY
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022 B000001 13-2518466
022 C000001 7600
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022 B000002 13-1912900
022 C000002 3285
022 D000002 1600
022 A000003 KIDDER PEABODY & CO., INC.
022 B000003 13-5650440
022 C000003 0
022 D000003 3680
022 A000004 SELIGMAN TAX-EXEMPT FUND-NATIONAL SERIES
022 B000004 13-3177004
022 C000004 0
022 D000004 3673
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022 B000005 13-5108880
022 C000005 3457
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022 B000006 43-0895447
022 C000006 3424
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022 A000007 PRAGER, MCCARTHY & LEWIS
022 B000007 13-3409771
<PAGE> PAGE 3
022 C000007 0
022 D000007 2322
022 A000008 DEAN WITTER REYNOLDS, INC.
022 B000008 94-1671384
022 C000008 0
022 D000008 1564
022 A000009 DONALDSON, LUFKIN & JENRETTE
022 B000009 13-2741729
022 C000009 1278
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022 B000010 13-3409771
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<PAGE> PAGE 4
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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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<PAGE> PAGE 9
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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-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 54679
<INVESTMENTS-AT-VALUE> 57726
<RECEIVABLES> 918
<ASSETS-OTHER> 201
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 58845
<PAYABLE-FOR-SECURITIES> 2451
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 191
<TOTAL-LIABILITIES> 2642
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53038
<SHARES-COMMON-STOCK> 8005<F1>
<SHARES-COMMON-PRIOR> 7735<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 118
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3047
<NET-ASSETS> 52883<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3124<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (441)<F1>
<NET-INVESTMENT-INCOME> 2683<F1>
<REALIZED-GAINS-CURRENT> 211
<APPREC-INCREASE-CURRENT> 1476
<NET-CHANGE-FROM-OPS> 4472
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2683)<F1>
<DISTRIBUTIONS-OF-GAINS> (722)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1410<F1>
<NUMBER-OF-SHARES-REDEEMED> (1433)<F1>
<SHARES-REINVESTED> 293<F1>
<NET-CHANGE-IN-ASSETS> 4020
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 656
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 255<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 441<F1>
<AVERAGE-NET-ASSETS> 50970<F1>
<PER-SHARE-NAV-BEGIN> 6.50<F1>
<PER-SHARE-NII> .34<F1>
<PER-SHARE-GAIN-APPREC> .20<F1>
<PER-SHARE-DIVIDEND> (.34)<F1>
<PER-SHARE-DISTRIBUTIONS> (.09)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 6.61<F1>
<EXPENSE-RATIO> .87<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-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 54679
<INVESTMENTS-AT-VALUE> 57726
<RECEIVABLES> 918
<ASSETS-OTHER> 201
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 58845
<PAYABLE-FOR-SECURITIES> 2451
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 191
<TOTAL-LIABILITIES> 2642
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53038
<SHARES-COMMON-STOCK> 502<F1>
<SHARES-COMMON-PRIOR> 295<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 118
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3047
<NET-ASSETS> 3320<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 144<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (42)<F1>
<NET-INVESTMENT-INCOME> 102<F1>
<REALIZED-GAINS-CURRENT> 211
<APPREC-INCREASE-CURRENT> 1476
<NET-CHANGE-FROM-OPS> 4472
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (102)<F1>
<DISTRIBUTIONS-OF-GAINS> (27)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 311<F1>
<NUMBER-OF-SHARES-REDEEMED> (118)<F1>
<SHARES-REINVESTED> 14<F1>
<NET-CHANGE-IN-ASSETS> 4020
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 656
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 12<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 42<F1>
<AVERAGE-NET-ASSETS> 2342<F1>
<PER-SHARE-NAV-BEGIN> 6.51<F1>
<PER-SHARE-NII> .28<F1>
<PER-SHARE-GAIN-APPREC> .19<F1>
<PER-SHARE-DIVIDEND> (.28)<F1>
<PER-SHARE-DISTRIBUTIONS> (.09)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 6.61<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>011
<NAME> SELIGMAN MUNICIPAL SERIES TRUST-CALIFORNA QUALITY CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 81265
<INVESTMENTS-AT-VALUE> 87417
<RECEIVABLES> 1351
<ASSETS-OTHER> 187
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 88955
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 286
<TOTAL-LIABILITIES> 286
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 82320
<SHARES-COMMON-STOCK> 12445<F1>
<SHARES-COMMON-PRIOR> 14159<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 197
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6152
<NET-ASSETS> 86992<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5276<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (743)<F1>
<NET-INVESTMENT-INCOME> 4533<F1>
<REALIZED-GAINS-CURRENT> 428
<APPREC-INCREASE-CURRENT> 2834
<NET-CHANGE-FROM-OPS> 7858
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4533)<F1>
<DISTRIBUTIONS-OF-GAINS> (28)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3053<F1>
<NUMBER-OF-SHARES-REDEEMED> (5099)<F1>
<SHARES-REINVESTED> 332<F1>
<NET-CHANGE-IN-ASSETS> (8537)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (202)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 454<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 743<F1>
<AVERAGE-NET-ASSETS> 90746<F1>
<PER-SHARE-NAV-BEGIN> 6.75<F1>
<PER-SHARE-NII> .34<F1>
<PER-SHARE-GAIN-APPREC> .24<F1>
<PER-SHARE-DIVIDEND> (.34)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 6.99<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>014
<NAME> SELIGMAN MUNICIPAL SERIES TRUST-CALIFORNA QUALITY CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 81265
<INVESTMENTS-AT-VALUE> 87417
<RECEIVABLES> 1351
<ASSETS-OTHER> 187
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 88955
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 286
<TOTAL-LIABILITIES> 286
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 82320
<SHARES-COMMON-STOCK> 240<F1>
<SHARES-COMMON-PRIOR> 244<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 197
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6152
<NET-ASSETS> 1677<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 90<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (27)<F1>
<NET-INVESTMENT-INCOME> 63<F1>
<REALIZED-GAINS-CURRENT> 428
<APPREC-INCREASE-CURRENT> 2834
<NET-CHANGE-FROM-OPS> 7858
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (63)<F1>
<DISTRIBUTIONS-OF-GAINS> (1)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 865<F1>
<NUMBER-OF-SHARES-REDEEMED> (874)<F1>
<SHARES-REINVESTED> 5<F1>
<NET-CHANGE-IN-ASSETS> (8537)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (202)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 7<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 27<F1>
<AVERAGE-NET-ASSETS> 1549<F1>
<PER-SHARE-NAV-BEGIN> 6.74<F1>
<PER-SHARE-NII> .28<F1>
<PER-SHARE-GAIN-APPREC> .23<F1>
<PER-SHARE-DIVIDEND> (.28)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 6.97<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>051
<NAME> SELIGMAN MUNICIPAL SERIES TRUST-FLORIDA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> SEP-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 41490
<INVESTMENTS-AT-VALUE> 43076
<RECEIVABLES> 854
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 43930
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 228
<TOTAL-LIABILITIES> 228
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 41716
<SHARES-COMMON-STOCK> 5390<F1>
<SHARES-COMMON-PRIOR> 5894<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 400
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1586
<NET-ASSETS> 42024<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2526<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (457)<F1>
<NET-INVESTMENT-INCOME> 2069<F1>
<REALIZED-GAINS-CURRENT> 402
<APPREC-INCREASE-CURRENT> 900
<NET-CHANGE-FROM-OPS> 3434
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2069)<F1>
<DISTRIBUTIONS-OF-GAINS> (612)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 535<F1>
<NUMBER-OF-SHARES-REDEEMED> (1189)<F1>
<SHARES-REINVESTED> 150<F1>
<NET-CHANGE-IN-ASSETS> (2775)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 630
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 220<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 457<F1>
<AVERAGE-NET-ASSETS> 43978<F1>
<PER-SHARE-NAV-BEGIN> 7.67<F1>
<PER-SHARE-NII> .36<F1>
<PER-SHARE-GAIN-APPREC> .23<F1>
<PER-SHARE-DIVIDEND> (.36)<F1>
<PER-SHARE-DISTRIBUTIONS> (.10)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.80<F1>
<EXPENSE-RATIO> 1.04<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-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 41490
<INVESTMENTS-AT-VALUE> 43076
<RECEIVABLES> 854
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 43930
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 228
<TOTAL-LIABILITIES> 228
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 41716
<SHARES-COMMON-STOCK> 215<F1>
<SHARES-COMMON-PRIOR> 166<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 400
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1586
<NET-ASSETS> 1678<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 92<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (29)<F1>
<NET-INVESTMENT-INCOME> 63<F1>
<REALIZED-GAINS-CURRENT> 402
<APPREC-INCREASE-CURRENT> 900
<NET-CHANGE-FROM-OPS> 3434
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (63)<F1>
<DISTRIBUTIONS-OF-GAINS> (20)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 84<F1>
<NUMBER-OF-SHARES-REDEEMED> (43)<F1>
<SHARES-REINVESTED> 8<F1>
<NET-CHANGE-IN-ASSETS> (2775)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 630
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 8<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 29<F1>
<AVERAGE-NET-ASSETS> 1603<F1>
<PER-SHARE-NAV-BEGIN> 7.68<F1>
<PER-SHARE-NII> .30<F1>
<PER-SHARE-GAIN-APPREC> .23<F1>
<PER-SHARE-DIVIDEND> (.30)<F1>
<PER-SHARE-DISTRIBUTIONS> (.10)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.81<F1>
<EXPENSE-RATIO> 1.81<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-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 31748
<INVESTMENTS-AT-VALUE> 33369
<RECEIVABLES> 579
<ASSETS-OTHER> 130
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 34078
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 177
<TOTAL-LIABILITIES> 177
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 32017
<SHARES-COMMON-STOCK> 4061<F1>
<SHARES-COMMON-PRIOR> 4584<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 263
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1621
<NET-ASSETS> 32684<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1962<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (371)<F1>
<NET-INVESTMENT-INCOME> 1591<F1>
<REALIZED-GAINS-CURRENT> 265
<APPREC-INCREASE-CURRENT> 797
<NET-CHANGE-FROM-OPS> 2701
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1591)<F1>
<DISTRIBUTIONS-OF-GAINS> (146)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 266<F1>
<NUMBER-OF-SHARES-REDEEMED> (908)<F1>
<SHARES-REINVESTED> 119<F1>
<NET-CHANGE-IN-ASSETS> (3265)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 148
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 171<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 371<F1>
<AVERAGE-NET-ASSETS> 34132<F1>
<PER-SHARE-NAV-BEGIN> 7.84<F1>
<PER-SHARE-NII> .37<F1>
<PER-SHARE-GAIN-APPREC> .24<F1>
<PER-SHARE-DIVIDEND> (.37)<F1>
<PER-SHARE-DISTRIBUTIONS> (.03)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.05<F1>
<EXPENSE-RATIO> 1.09<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-30-1997
<PERIOD-END> SEP-30-1997
<INVESTMENTS-AT-COST> 31748
<INVESTMENTS-AT-VALUE> 33369
<RECEIVABLES> 579
<ASSETS-OTHER> 130
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 34078
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 177
<TOTAL-LIABILITIES> 177
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 32017
<SHARES-COMMON-STOCK> 151<F1>
<SHARES-COMMON-PRIOR> 157<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 263
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1621
<NET-ASSETS> 1217<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 70<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (22)<F1>
<NET-INVESTMENT-INCOME> 48<F1>
<REALIZED-GAINS-CURRENT> 265
<APPREC-INCREASE-CURRENT> 797
<NET-CHANGE-FROM-OPS> 2701
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (48)<F1>
<DISTRIBUTIONS-OF-GAINS> (4)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 16<F1>
<NUMBER-OF-SHARES-REDEEMED> (27)<F1>
<SHARES-REINVESTED> 5<F1>
<NET-CHANGE-IN-ASSETS> (3265)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 148
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 22<F1>
<AVERAGE-NET-ASSETS> 1217<F1>
<PER-SHARE-NAV-BEGIN> 7.83<F1>
<PER-SHARE-NII> .31<F1>
<PER-SHARE-GAIN-APPREC> .25<F1>
<PER-SHARE-DIVIDEND> (.31)<F1>
<PER-SHARE-DISTRIBUTIONS> (.03)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.05<F1>
<EXPENSE-RATIO> 1.85<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 Directors
Seligman Municipal Series Trust
In planning and performing our audit of the financial statements of Seligman
Municipal Series Trust (the "Trust") for the year ended September 30, 1997, we
considered its internal control structure, including procedures for safeguarding
securities, in order to determine our auditing procedures for the purpose of
expressing an opinion on the financial statements and to comply with the
requirements of Form N-SAR, not to provide assurance on the internal control
structure.
The management of the Trust is responsible for establishing and maintaining an
internal control structure. In fulfilling this responsibility, estimates and
judgments by management are required to assess the expected benefits and related
costs of internal control structure policies and procedures. Two of the
objectives of an internal control structure are to provide management with
reasonable, but not absolute, assurance that assets are safeguarded against loss
from unauthorized use or disposition and that transactions are executed in
accordance with management's authorization and recorded properly to permit the
preparation of financial statements in conformity with generally accepted
accounting principles.
Because of the inherent limitations in any internal control structure, errors or
irregularities may occur and not be detected. Also, projection of any evaluation
of the structure to future periods is subject to the risk that it may be
inadequate because of changes in conditions or that the effectiveness of the
design and operation may deteriorate.
Our consideration of internal control structure would not necessarily disclose
all matters in the internal control structure 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 the specific internal control structure elements does not reduce to a
relatively low level the risk that errors or irregularities 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 internal control structure, including procedures for safeguarding
securities, that we consider to be material weaknesses as defined above as of
September 30, 1997.
This report is intended solely for the information and use of management and the
Securities and Exchange Commission.
October 31, 1997
