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<PAGE> PAGE 10
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 17
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<PAGE> PAGE 19
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<PAGE> PAGE 20
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<PAGE> PAGE 22
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<PAGE> PAGE 23
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<PAGE> PAGE 24
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<PAGE> PAGE 25
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<PAGE> PAGE 26
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<PAGE> PAGE 27
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<PAGE> PAGE 28
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<PAGE> PAGE 29
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<PAGE> PAGE 30
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<PAGE> PAGE 31
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<PAGE> PAGE 32
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<PAGE> PAGE 33
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<PAGE> PAGE 34
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<PAGE> PAGE 35
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<PAGE> PAGE 36
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<PAGE> PAGE 37
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<PAGE> PAGE 38
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<PAGE> PAGE 39
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<PAGE> PAGE 40
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<PAGE> PAGE 41
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<PAGE> PAGE 42
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074 C001000 500
074 D001000 48210
074 E001000 0
074 F001000 0
074 G001000 0
074 H001000 0
074 I001000 0
074 J001000 41
074 K001000 6
074 L001000 892
074 M001000 0
074 N001000 49739
074 O001000 0
074 P001000 24
074 Q001000 0
074 R011000 0
074 R021000 0
074 R031000 0
074 R041000 145
074 S001000 0
074 T001000 49570
074 U011000 6297
074 U021000 81
074 V011000 7.77
074 V021000 7.77
074 W001000 0.0000
074 X001000 1298
074 Y001000 0
075 A001000 0
075 B001000 49916
076 001000 0.00
028 A011100 457
028 A021100 139
028 A031100 0
028 A041100 437
028 B011100 327
028 B021100 430
028 B031100 0
028 B041100 321
028 C011100 1777
028 C021100 137
028 C031100 0
028 C041100 270
028 D011100 376
028 D021100 149
028 D031100 0
028 D041100 604
028 E011100 282
028 E021100 139
028 E031100 0
<PAGE> PAGE 43
028 E041100 1309
028 F011100 1323
028 F021100 128
028 F031100 0
028 F041100 1271
028 G011100 4542
028 G021100 1122
028 G031100 0
028 G041100 4212
028 H001100 2197
029 001100 Y
030 A001100 86
030 B001100 4.75
030 C001100 0.00
031 A001100 10
031 B001100 0
032 001100 76
033 001100 0
034 001100 Y
035 001100 0
036 A001100 N
036 B001100 0
042 A001100 0
042 B001100 0
042 C001100 0
042 D001100 100
042 E001100 0
042 F001100 0
042 G001100 0
042 H001100 0
043 001100 43
044 001100 0
055 A001100 N
055 B001100 N
056 001100 Y
057 001100 N
062 A001100 Y
062 B001100 0.0
062 C001100 0.0
062 D001100 0.0
062 E001100 0.5
062 F001100 0.0
062 G001100 0.0
062 H001100 0.0
062 I001100 0.0
062 J001100 0.0
062 K001100 0.0
062 L001100 1.2
062 M001100 0.0
062 N001100 0.0
062 O001100 98.3
<PAGE> PAGE 44
062 P001100 0.0
062 Q001100 0.0
062 R001100 0.0
063 A001100 0
063 B001100 17.9
064 A001100 Y
064 B001100 N
070 A011100 Y
070 A021100 N
070 B011100 N
070 B021100 N
070 C011100 N
070 C021100 N
070 D011100 N
070 D021100 N
070 E011100 N
070 E021100 N
070 F011100 N
070 F021100 N
070 G011100 N
070 G021100 N
070 H011100 N
070 H021100 N
070 I011100 N
070 I021100 N
070 J011100 Y
070 J021100 N
070 K011100 N
070 K021100 N
070 L011100 N
070 L021100 N
070 M011100 N
070 M021100 N
070 N011100 N
070 N021100 N
070 O011100 N
070 O021100 N
070 P011100 Y
070 P021100 N
070 Q011100 N
070 Q021100 N
070 R011100 N
070 R021100 N
071 A001100 6192
071 B001100 3999
071 C001100 59153
071 D001100 7
072 A001100 6
072 B001100 1602
072 C001100 0
072 D001100 0
<PAGE> PAGE 45
072 E001100 0
072 F001100 151
072 G001100 0
072 H001100 0
072 I001100 43
072 J001100 8
072 K001100 3
072 L001100 5
072 M001100 3
072 N001100 7
072 O001100 0
072 P001100 0
072 Q001100 0
072 R001100 11
072 S001100 4
072 T001100 43
072 U001100 0
072 V001100 0
072 W001100 2
072 X001100 280
072 Y001100 0
072 Z001100 1322
072AA001100 232
072BB001100 0
072CC011100 0
072CC021100 825
072DD011100 1275
072DD021100 47
072EE001100 375
073 A011100 0.1734
073 A021100 0.1378
073 B001100 0.0500
073 C001100 0.0000
074 A001100 0
074 B001100 0
074 C001100 300
074 D001100 59725
074 E001100 0
074 F001100 0
074 G001100 0
074 H001100 0
074 I001100 0
074 J001100 0
074 K001100 8
074 L001100 1069
074 M001100 4
074 N001100 61106
074 O001100 0
074 P001100 28
074 Q001100 0
074 R011100 0
<PAGE> PAGE 46
074 R021100 0
074 R031100 0
074 R041100 343
074 S001100 0
074 T001100 60735
074 U011100 7320
074 U021100 351
074 V011100 7.92
074 V021100 7.91
074 W001100 0.0000
074 X001100 1536
074 Y001100 0
075 A001100 0
075 B001100 60694
076 001100 0.00
028 A011300 166
028 A021300 127
028 A031300 0
028 A041300 888
028 B011300 276
028 B021300 334
028 B031300 0
028 B041300 182
028 C011300 1023
028 C021300 121
028 C031300 0
028 C041300 271
028 D011300 586
028 D021300 130
028 D031300 0
028 D041300 579
028 E011300 252
028 E021300 123
028 E031300 0
028 E041300 668
028 F011300 101
028 F021300 115
028 F031300 0
028 F041300 1337
028 G011300 2404
028 G021300 950
028 G031300 0
028 G041300 3925
028 H001300 1077
029 001300 Y
030 A001300 47
030 B001300 4.75
030 C001300 0.00
031 A001300 5
031 B001300 0
032 001300 42
<PAGE> PAGE 47
033 001300 0
034 001300 Y
035 001300 1
036 A001300 N
036 B001300 0
042 A001300 0
042 B001300 0
042 C001300 0
042 D001300 100
042 E001300 0
042 F001300 0
042 G001300 0
042 H001300 0
043 001300 39
044 001300 0
055 A001300 N
055 B001300 N
056 001300 Y
057 001300 N
062 A001300 Y
062 B001300 0.0
062 C001300 0.0
062 D001300 0.0
062 E001300 2.0
062 F001300 0.0
062 G001300 0.0
062 H001300 0.0
062 I001300 0.0
062 J001300 0.0
062 K001300 0.0
062 L001300 -0.1
062 M001300 0.0
062 N001300 0.0
062 O001300 98.1
062 P001300 0.0
062 Q001300 0.0
062 R001300 0.0
063 A001300 0
063 B001300 17.7
064 A001300 Y
064 B001300 N
070 A011300 Y
070 A021300 N
070 B011300 N
070 B021300 N
070 C011300 N
070 C021300 N
070 D011300 N
070 D021300 N
070 E011300 N
070 E021300 N
<PAGE> PAGE 48
070 F011300 N
070 F021300 N
070 G011300 N
070 G021300 N
070 H011300 N
070 H021300 N
070 I011300 N
070 I021300 N
070 J011300 Y
070 J021300 N
070 K011300 N
070 K021300 N
070 L011300 N
070 L021300 N
070 M011300 N
070 M021300 N
070 N011300 N
070 N021300 N
070 O011300 N
070 O021300 N
070 P011300 Y
070 P021300 N
070 Q011300 N
070 Q021300 N
070 R011300 N
070 R021300 N
071 A001300 0
071 B001300 0
071 C001300 49146
071 D001300 0
072 A001300 6
072 B001300 1355
072 C001300 0
072 D001300 0
072 E001300 0
072 F001300 127
072 G001300 0
072 H001300 0
072 I001300 39
072 J001300 3
072 K001300 3
072 L001300 8
072 M001300 4
072 N001300 4
072 O001300 0
072 P001300 0
072 Q001300 0
072 R001300 10
072 S001300 1
072 T001300 39
072 U001300 0
<PAGE> PAGE 49
072 V001300 0
072 W001300 1
072 X001300 239
072 Y001300 0
072 Z001300 1116
072AA001300 0
072BB001300 0
072CC011300 0
072CC021300 669
072DD011300 1066
072DD021300 50
072EE001300 272
073 A011300 0.1826
073 A021300 0.1462
073 B001300 0.0450
073 C001300 0.0000
074 A001300 102
074 B001300 0
074 C001300 1000
074 D001300 48798
074 E001300 0
074 F001300 0
074 G001300 0
074 H001300 0
074 I001300 0
074 J001300 0
074 K001300 6
074 L001300 783
074 M001300 1
074 N001300 50690
074 O001300 0
074 P001300 25
074 Q001300 0
074 R011300 0
074 R021300 0
074 R031300 0
074 R041300 944
074 S001300 0
074 T001300 49721
074 U011300 5718
074 U021300 324
074 V011300 8.23
074 V021300 8.25
074 W001300 0.0000
074 X001300 1061
074 Y001300 0
075 A001300 0
075 B001300 50830
076 001300 0.00
028 A011500 634
028 A021500 243
<PAGE> PAGE 50
028 A031500 0
028 A041500 824
028 B011500 540
028 B021500 933
028 B031500 0
028 B041500 691
028 C011500 850
028 C021500 230
028 C031500 0
028 C041500 1357
028 D011500 1016
028 D021500 248
028 D031500 0
028 D041500 1079
028 E011500 813
028 E021500 236
028 E031500 0
028 E041500 649
028 F011500 1495
028 F021500 222
028 F031500 0
028 F041500 1073
028 G011500 5348
028 G021500 2112
028 G031500 0
028 G041500 5673
028 H001500 2869
029 001500 Y
030 A001500 98
030 B001500 4.75
030 C001500 0.00
031 A001500 12
031 B001500 0
032 001500 84
033 001500 2
034 001500 Y
035 001500 0
036 A001500 N
036 B001500 0
042 A001500 0
042 B001500 0
042 C001500 0
042 D001500 100
042 E001500 0
042 F001500 0
042 G001500 0
042 H001500 0
043 001500 83
044 001500 0
055 A001500 N
055 B001500 N
<PAGE> PAGE 51
056 001500 Y
057 001500 N
062 A001500 Y
062 B001500 0.0
062 C001500 0.0
062 D001500 0.0
062 E001500 2.1
062 F001500 0.0
062 G001500 0.0
062 H001500 0.0
062 I001500 0.0
062 J001500 0.0
062 K001500 0.0
062 L001500 1.4
062 M001500 0.0
062 N001500 0.0
062 O001500 96.5
062 P001500 0.0
062 Q001500 0.0
062 R001500 0.0
063 A001500 0
063 B001500 20.3
064 A001500 Y
064 B001500 N
070 A011500 Y
070 A021500 N
070 B011500 N
070 B021500 N
070 C011500 N
070 C021500 N
070 D011500 N
070 D021500 N
070 E011500 N
070 E021500 N
070 F011500 N
070 F021500 N
070 G011500 N
070 G021500 N
070 H011500 N
070 H021500 N
070 I011500 N
070 I021500 N
070 J011500 Y
070 J021500 N
070 K011500 N
070 K021500 N
070 L011500 N
070 L021500 N
070 M011500 N
070 M021500 N
070 N011500 N
<PAGE> PAGE 52
070 N021500 N
070 O011500 N
070 O021500 N
070 P011500 Y
070 P021500 N
070 Q011500 N
070 Q021500 N
070 R011500 N
070 R021500 N
071 A001500 1598
071 B001500 1788
071 C001500 106889
071 D001500 2
072 A001500 6
072 B001500 2968
072 C001500 0
072 D001500 0
072 E001500 0
072 F001500 277
072 G001500 0
072 H001500 0
072 I001500 77
072 J001500 13
072 K001500 3
072 L001500 5
072 M001500 5
072 N001500 6
072 O001500 0
072 P001500 0
072 Q001500 0
072 R001500 15
072 S001500 3
072 T001500 83
072 U001500 0
072 V001500 0
072 W001500 2
072 X001500 489
072 Y001500 0
072 Z001500 2479
072AA001500 146
072BB001500 0
072CC011500 0
072CC021500 1951
072DD011500 2375
072DD021500 104
072EE001500 880
073 A011500 0.1856
073 A021500 0.1485
073 B001500 0.0660
073 C001500 0.0000
074 A001500 127
<PAGE> PAGE 53
074 B001500 0
074 C001500 2300
074 D001500 107120
074 E001500 0
074 F001500 0
074 G001500 0
074 H001500 0
074 I001500 0
074 J001500 0
074 K001500 14
074 L001500 1927
074 M001500 1
074 N001500 111489
074 O001500 0
074 P001500 52
074 Q001500 0
074 R011500 0
074 R021500 0
074 R031500 0
074 R041500 413
074 S001500 0
074 T001500 111024
074 U011500 12774
074 U021500 793
074 V011500 8.18
074 V021500 8.18
074 W001500 0.0000
074 X001500 2088
074 Y001500 0
075 A001500 0
075 B001500 111082
076 001500 0.00
SIGNATURE THOMAS G. ROSE
TITLE TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>011
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NATIONAL CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 101660
<INVESTMENTS-AT-VALUE> 107302
<RECEIVABLES> 1567
<ASSETS-OTHER> 123
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 108993
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 468
<TOTAL-LIABILITIES> 468
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 104332
<SHARES-COMMON-STOCK> 12313<F1>
<SHARES-COMMON-PRIOR> 12255<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1449)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5642
<NET-ASSETS> 100557<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2820<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (423)<F1>
<NET-INVESTMENT-INCOME> 2397<F1>
<REALIZED-GAINS-CURRENT> 110
<APPREC-INCREASE-CURRENT> (2109)
<NET-CHANGE-FROM-OPS> 506
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2397)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1222<F1>
<NUMBER-OF-SHARES-REDEEMED> (1325)<F1>
<SHARES-REINVESTED> 161<F1>
<NET-CHANGE-IN-ASSETS> (776)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (1559)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 255<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 423<F1>
<AVERAGE-NET-ASSETS> 102122<F1>
<PER-SHARE-NAV-BEGIN> 8.32<F1>
<PER-SHARE-NII> .19<F1>
<PER-SHARE-GAIN-APPREC> (.15)<F1>
<PER-SHARE-DIVIDEND> (.19)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.17<F1>
<EXPENSE-RATIO> .83<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>014
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NATIONAL CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 101660
<INVESTMENTS-AT-VALUE> 107302
<RECEIVABLES> 1567
<ASSETS-OTHER> 123
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 108993
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 468
<TOTAL-LIABILITIES> 468
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 104332
<SHARES-COMMON-STOCK> 976<F1>
<SHARES-COMMON-PRIOR> 889<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1449)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5642
<NET-ASSETS> 7968<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 156<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (48)<F1>
<NET-INVESTMENT-INCOME> 108<F1>
<REALIZED-GAINS-CURRENT> 110
<APPREC-INCREASE-CURRENT> (2109)
<NET-CHANGE-FROM-OPS> 506
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (108)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 607<F1>
<NUMBER-OF-SHARES-REDEEMED> (528)<F1>
<SHARES-REINVESTED> 8<F1>
<NET-CHANGE-IN-ASSETS> (776)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (1559)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 14<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 48<F1>
<AVERAGE-NET-ASSETS> 5645<F1>
<PER-SHARE-NAV-BEGIN> 8.31<F1>
<PER-SHARE-NII> .16<F1>
<PER-SHARE-GAIN-APPREC> (.15)<F1>
<PER-SHARE-DIVIDEND> (.16)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.16<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>091
<NAME> SELIGMAN MUNICIPAL FUND SERIES - COLORADO CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 44521
<INVESTMENTS-AT-VALUE> 46964
<RECEIVABLES> 892
<ASSETS-OTHER> 126
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 47983
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 203
<TOTAL-LIABILITIES> 203
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 45356
<SHARES-COMMON-STOCK> 6234<F1>
<SHARES-COMMON-PRIOR> 5968<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (20)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2443
<NET-ASSETS> 46896<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1263<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (210)<F1>
<NET-INVESTMENT-INCOME> 1053<F1>
<REALIZED-GAINS-CURRENT> 96
<APPREC-INCREASE-CURRENT> (817)
<NET-CHANGE-FROM-OPS> 344
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1053)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 662<F1>
<NUMBER-OF-SHARES-REDEEMED> (474)<F1>
<SHARES-REINVESTED> 78<F1>
<NET-CHANGE-IN-ASSETS> 1853
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (116)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 116<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 210<F1>
<AVERAGE-NET-ASSETS> 46725<F1>
<PER-SHARE-NAV-BEGIN> 7.64<F1>
<PER-SHARE-NII> .17<F1>
<PER-SHARE-GAIN-APPREC> (.12)<F1>
<PER-SHARE-DIVIDEND> (.17)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.52<F1>
<EXPENSE-RATIO> .90<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>094
<NAME> SELIGMAN MUNICIPAL FUND SERIES - COLORADO CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 44521
<INVESTMENTS-AT-VALUE> 46964
<RECEIVABLES> 892
<ASSETS-OTHER> 126
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 47983
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 203
<TOTAL-LIABILITIES> 203
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 45356
<SHARES-COMMON-STOCK> 117<F1>
<SHARES-COMMON-PRIOR> 45<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (20)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2443
<NET-ASSETS> 884<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 18<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (6)<F1>
<NET-INVESTMENT-INCOME> 12<F1>
<REALIZED-GAINS-CURRENT> 96
<APPREC-INCREASE-CURRENT> (817)
<NET-CHANGE-FROM-OPS> 344
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (12)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 83<F1>
<NUMBER-OF-SHARES-REDEEMED> (12)<F1>
<SHARES-REINVESTED> 1<F1>
<NET-CHANGE-IN-ASSETS> 1853
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (116)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6<F1>
<AVERAGE-NET-ASSETS> 679<F1>
<PER-SHARE-NAV-BEGIN> 7.63<F1>
<PER-SHARE-NII> .14<F1>
<PER-SHARE-GAIN-APPREC> (.11)<F1>
<PER-SHARE-DIVIDEND> (.14)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.52<F1>
<EXPENSE-RATIO> 1.80<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>131
<NAME> SELIGMAN MUNICIPAL FUND SERIES-GEORGIA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 45867
<INVESTMENTS-AT-VALUE> 49798
<RECEIVABLES> 789
<ASSETS-OTHER> 102
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 50690
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 969
<TOTAL-LIABILITIES> 969
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 45795
<SHARES-COMMON-STOCK> 5718<F1>
<SHARES-COMMON-PRIOR> 5777<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (5)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3931
<NET-ASSETS> 47043<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1280<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (214)<F1>
<NET-INVESTMENT-INCOME> 1066<F1>
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> (669)
<NET-CHANGE-FROM-OPS> 447
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1066)<F1>
<DISTRIBUTIONS-OF-GAINS> (257)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 234<F1>
<NUMBER-OF-SHARES-REDEEMED> (402)<F1>
<SHARES-REINVESTED> 109<F1>
<NET-CHANGE-IN-ASSETS> (1512)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 267
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 120<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 214<F1>
<AVERAGE-NET-ASSETS> 48050<F1>
<PER-SHARE-NAV-BEGIN> 8.38<F1>
<PER-SHARE-NII> .18<F1>
<PER-SHARE-GAIN-APPREC> (.10)<F1>
<PER-SHARE-DIVIDEND> (.18)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.23<F1>
<EXPENSE-RATIO> .89<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>134
<NAME> SELIGMAN MUNICIPAL FUND SERIES-GEORGIA CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 45867
<INVESTMENTS-AT-VALUE> 49798
<RECEIVABLES> 789
<ASSETS-OTHER> 102
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 50690
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 969
<TOTAL-LIABILITIES> 969
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 45795
<SHARES-COMMON-STOCK> 324<F1>
<SHARES-COMMON-PRIOR> 334<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (5)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3931
<NET-ASSETS> 2678<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 75<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (25)<F1>
<NET-INVESTMENT-INCOME> 50<F1>
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> (669)
<NET-CHANGE-FROM-OPS> 447
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (50)<F1>
<DISTRIBUTIONS-OF-GAINS> (15)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 56<F1>
<NUMBER-OF-SHARES-REDEEMED> (72)<F1>
<SHARES-REINVESTED> 6<F1>
<NET-CHANGE-IN-ASSETS> (1512)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 267
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 7<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 25<F1>
<AVERAGE-NET-ASSETS> 2812<F1>
<PER-SHARE-NAV-BEGIN> 8.40<F1>
<PER-SHARE-NII> .15<F1>
<PER-SHARE-GAIN-APPREC> (.10)<F1>
<PER-SHARE-DIVIDEND> (.15)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.25<F1>
<EXPENSE-RATIO> 1.79<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>071
<NAME> SELIGMAN MUNICIPAL FUND SERIES-LOUISIANA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 53841
<INVESTMENTS-AT-VALUE> 57204
<RECEIVABLES> 1310
<ASSETS-OTHER> 123
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 58638
<PAYABLE-FOR-SECURITIES> 2748
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 541
<TOTAL-LIABILITIES> 3289
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 51854
<SHARES-COMMON-STOCK> 6592<F1>
<SHARES-COMMON-PRIOR> 6619<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 133
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3363
<NET-ASSETS> 54587<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1540<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (242)<F1>
<NET-INVESTMENT-INCOME> 1298<F1>
<REALIZED-GAINS-CURRENT> 138
<APPREC-INCREASE-CURRENT> (906)
<NET-CHANGE-FROM-OPS> 545
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1298)<F1>
<DISTRIBUTIONS-OF-GAINS> (742)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 98<F1>
<NUMBER-OF-SHARES-REDEEMED> (261)<F1>
<SHARES-REINVESTED> 136<F1>
<NET-CHANGE-IN-ASSETS> (1795)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 748
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 139<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 242<F1>
<AVERAGE-NET-ASSETS> 55788<F1>
<PER-SHARE-NAV-BEGIN> 8.51<F1>
<PER-SHARE-NII> .19<F1>
<PER-SHARE-GAIN-APPREC> (.12)<F1>
<PER-SHARE-DIVIDEND> (.19)<F1>
<PER-SHARE-DISTRIBUTIONS> (.11)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.28<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>074
<NAME> SELIGMAN MUNICIPAL FUND SERIES-LOUISIANA CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 53841
<INVESTMENTS-AT-VALUE> 57204
<RECEIVABLES> 1310
<ASSETS-OTHER> 123
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 58638
<PAYABLE-FOR-SECURITIES> 2748
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 541
<TOTAL-LIABILITIES> 3289
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 51854
<SHARES-COMMON-STOCK> 92<F1>
<SHARES-COMMON-PRIOR> 99<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 133
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3363
<NET-ASSETS> 762<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 22<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (7)<F1>
<NET-INVESTMENT-INCOME> 15<F1>
<REALIZED-GAINS-CURRENT> 138
<APPREC-INCREASE-CURRENT> (906)
<NET-CHANGE-FROM-OPS> 545
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (15)<F1>
<DISTRIBUTIONS-OF-GAINS> (11)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 7<F1>
<NUMBER-OF-SHARES-REDEEMED> (16)<F1>
<SHARES-REINVESTED> 2<F1>
<NET-CHANGE-IN-ASSETS> (1795)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 748
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 15<F1>
<AVERAGE-NET-ASSETS> 785<F1>
<PER-SHARE-NAV-BEGIN> 8.50<F1>
<PER-SHARE-NII> .16<F1>
<PER-SHARE-GAIN-APPREC> (.11)<F1>
<PER-SHARE-DIVIDEND> (.16)<F1>
<PER-SHARE-DISTRIBUTIONS> (.11)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.28<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>081
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MARYLAND CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 52012
<INVESTMENTS-AT-VALUE> 55863
<RECEIVABLES> 970
<ASSETS-OTHER> 67
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 56901
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 359
<TOTAL-LIABILITIES> 359
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 52701
<SHARES-COMMON-STOCK> 6516<F1>
<SHARES-COMMON-PRIOR> 6598<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3851
<NET-ASSETS> 53490<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1502<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (241)<F1>
<NET-INVESTMENT-INCOME> 1261<F1>
<REALIZED-GAINS-CURRENT> 1
<APPREC-INCREASE-CURRENT> (572)
<NET-CHANGE-FROM-OPS> 750
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1261)<F1>
<DISTRIBUTIONS-OF-GAINS> (185)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 141<F1>
<NUMBER-OF-SHARES-REDEEMED> (331)<F1>
<SHARES-REINVESTED> 108<F1>
<NET-CHANGE-IN-ASSETS> (1477)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 185
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 136<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 241<F1>
<AVERAGE-NET-ASSETS> 54429<F1>
<PER-SHARE-NAV-BEGIN> 8.32<F1>
<PER-SHARE-NII> .19<F1>
<PER-SHARE-GAIN-APPREC> (.08)<F1>
<PER-SHARE-DIVIDEND> (.19)<F1>
<PER-SHARE-DISTRIBUTIONS> (.03)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.21<F1>
<EXPENSE-RATIO> .89<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>084
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MARYLAND CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 52012
<INVESTMENTS-AT-VALUE> 55863
<RECEIVABLES> 970
<ASSETS-OTHER> 67
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 56901
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 359
<TOTAL-LIABILITIES> 359
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 52701
<SHARES-COMMON-STOCK> 371<F1>
<SHARES-COMMON-PRIOR> 375<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3851
<NET-ASSETS> 3052<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 89<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (29)<F1>
<NET-INVESTMENT-INCOME> 60<F1>
<REALIZED-GAINS-CURRENT> 1
<APPREC-INCREASE-CURRENT> (572)
<NET-CHANGE-FROM-OPS> 750
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (60)<F1>
<DISTRIBUTIONS-OF-GAINS> (11)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 43<F1>
<NUMBER-OF-SHARES-REDEEMED> (55)<F1>
<SHARES-REINVESTED> 8<F1>
<NET-CHANGE-IN-ASSETS> (1477)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 185
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 8<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 29<F1>
<AVERAGE-NET-ASSETS> 3221<F1>
<PER-SHARE-NAV-BEGIN> 8.33<F1>
<PER-SHARE-NII> .15<F1>
<PER-SHARE-GAIN-APPREC> (.08)<F1>
<PER-SHARE-DIVIDEND> (.15)<F1>
<PER-SHARE-DISTRIBUTIONS> (.03)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.22<F1>
<EXPENSE-RATIO> 1.79<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>021
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MASSACHUSETTS CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 98050
<INVESTMENTS-AT-VALUE> 104955
<RECEIVABLES> 1529
<ASSETS-OTHER> 142
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 106627
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 853
<TOTAL-LIABILITIES> 853
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 98624
<SHARES-COMMON-STOCK> 12794<F1>
<SHARES-COMMON-PRIOR> 13227<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 245
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6905
<NET-ASSETS> 103400<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2820<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (441)<F1>
<NET-INVESTMENT-INCOME> 2379<F1>
<REALIZED-GAINS-CURRENT> 540
<APPREC-INCREASE-CURRENT> (2345)
<NET-CHANGE-FROM-OPS> 606
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2379)<F1>
<DISTRIBUTIONS-OF-GAINS> (643)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1428<F1>
<NUMBER-OF-SHARES-REDEEMED> (2088)<F1>
<SHARES-REINVESTED> 227<F1>
<NET-CHANGE-IN-ASSETS> (5021)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 357
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 266<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 441<F1>
<AVERAGE-NET-ASSETS> 106655<F1>
<PER-SHARE-NAV-BEGIN> 8.27<F1>
<PER-SHARE-NII> .18<F1>
<PER-SHARE-GAIN-APPREC> (.14)<F1>
<PER-SHARE-DIVIDEND> (.18)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.08<F1>
<EXPENSE-RATIO> .83<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>024
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MASSACHUSETTS CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 98050
<INVESTMENTS-AT-VALUE> 104955
<RECEIVABLES> 1529
<ASSETS-OTHER> 142
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 106627
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 853
<TOTAL-LIABILITIES> 853
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 98624
<SHARES-COMMON-STOCK> 294<F1>
<SHARES-COMMON-PRIOR> 178<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 245
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6905
<NET-ASSETS> 2374<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 47<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (15)<F1>
<NET-INVESTMENT-INCOME> 32<F1>
<REALIZED-GAINS-CURRENT> 540
<APPREC-INCREASE-CURRENT> (2345)
<NET-CHANGE-FROM-OPS> 606
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (32)<F1>
<DISTRIBUTIONS-OF-GAINS> (9)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 143<F1>
<NUMBER-OF-SHARES-REDEEMED> (29)<F1>
<SHARES-REINVESTED> 2<F1>
<NET-CHANGE-IN-ASSETS> (5021)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 357
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 15<F1>
<AVERAGE-NET-ASSETS> 1786<F1>
<PER-SHARE-NAV-BEGIN> 8.26<F1>
<PER-SHARE-NII> .14<F1>
<PER-SHARE-GAIN-APPREC> (.13)<F1>
<PER-SHARE-DIVIDEND> (.14)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.08<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>031
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MICHIGAN CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 130618
<INVESTMENTS-AT-VALUE> 139056
<RECEIVABLES> 2567
<ASSETS-OTHER> 63
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 141688
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 488
<TOTAL-LIABILITIES> 488
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 132487
<SHARES-COMMON-STOCK> 16215<F1>
<SHARES-COMMON-PRIOR> 16333<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 275
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8438
<NET-ASSETS> 138558<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3835<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (571)<F1>
<NET-INVESTMENT-INCOME> 3264<F1>
<REALIZED-GAINS-CURRENT> 410
<APPREC-INCREASE-CURRENT> (2439)
<NET-CHANGE-FROM-OPS> 1277
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3264)<F1>
<DISTRIBUTIONS-OF-GAINS> (2565)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 401<F1>
<NUMBER-OF-SHARES-REDEEMED> (967)<F1>
<SHARES-REINVESTED> 448<F1>
<NET-CHANGE-IN-ASSETS> (4802)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2468
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 351<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 571<F1>
<AVERAGE-NET-ASSETS> 140809<F1>
<PER-SHARE-NAV-BEGIN> 8.83<F1>
<PER-SHARE-NII> .20<F1>
<PER-SHARE-GAIN-APPREC> (.12)<F1>
<PER-SHARE-DIVIDEND> (.20)<F1>
<PER-SHARE-DISTRIBUTIONS> (.16)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.55<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>034
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MICHIGAN CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 130618
<INVESTMENTS-AT-VALUE> 139056
<RECEIVABLES> 2567
<ASSETS-OTHER> 63
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 141688
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 488
<TOTAL-LIABILITIES> 488
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 132487
<SHARES-COMMON-STOCK> 310<F1>
<SHARES-COMMON-PRIOR> 209<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 275
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8438
<NET-ASSETS> 2642<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 62<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (20)<F1>
<NET-INVESTMENT-INCOME> 42<F1>
<REALIZED-GAINS-CURRENT> 410
<APPREC-INCREASE-CURRENT> (2439)
<NET-CHANGE-FROM-OPS> 1277
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (42)<F1>
<DISTRIBUTIONS-OF-GAINS> (38)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 113<F1>
<NUMBER-OF-SHARES-REDEEMED> (19)<F1>
<SHARES-REINVESTED> 7<F1>
<NET-CHANGE-IN-ASSETS> (4802)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2468
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 20<F1>
<AVERAGE-NET-ASSETS> 2278<F1>
<PER-SHARE-NAV-BEGIN> 8.82<F1>
<PER-SHARE-NII> .16<F1>
<PER-SHARE-GAIN-APPREC> (.12)<F1>
<PER-SHARE-DIVIDEND> (.16)<F1>
<PER-SHARE-DISTRIBUTIONS> (.16)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.54<F1>
<EXPENSE-RATIO> 1.71<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>041
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MINNESOTA SERIES CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 113178
<INVESTMENTS-AT-VALUE> 119242
<RECEIVABLES> 1961
<ASSETS-OTHER> 81
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 121285
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 429
<TOTAL-LIABILITIES> 429
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 114345
<SHARES-COMMON-STOCK> 15230<F1>
<SHARES-COMMON-PRIOR> 15217<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 447
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6064
<NET-ASSETS> 118743<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3276<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (504)<F1>
<NET-INVESTMENT-INCOME> 2772<F1>
<REALIZED-GAINS-CURRENT> 459
<APPREC-INCREASE-CURRENT> (1722)
<NET-CHANGE-FROM-OPS> 1550
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2772)<F1>
<DISTRIBUTIONS-OF-GAINS> (1489)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 306<F1>
<NUMBER-OF-SHARES-REDEEMED> (679)<F1>
<SHARES-REINVESTED> 386<F1>
<NET-CHANGE-IN-ASSETS> (2621)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1504
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 299<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 504<F1>
<AVERAGE-NET-ASSETS> 119933<F1>
<PER-SHARE-NAV-BEGIN> 7.98<F1>
<PER-SHARE-NII> .18<F1>
<PER-SHARE-GAIN-APPREC> (.08)<F1>
<PER-SHARE-DIVIDEND> (.18)<F1>
<PER-SHARE-DISTRIBUTIONS> (.10)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.80<F1>
<EXPENSE-RATIO> .84<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>044
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MINNESOTA SERIES CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 113178
<INVESTMENTS-AT-VALUE> 119242
<RECEIVABLES> 1961
<ASSETS-OTHER> 81
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 121285
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 429
<TOTAL-LIABILITIES> 429
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 114345
<SHARES-COMMON-STOCK> 271<F1>
<SHARES-COMMON-PRIOR> 263<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 447
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6064
<NET-ASSETS> 2113<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 60<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (19)<F1>
<NET-INVESTMENT-INCOME> 41<F1>
<REALIZED-GAINS-CURRENT> 459
<APPREC-INCREASE-CURRENT> (1722)
<NET-CHANGE-FROM-OPS> 1550
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (41)<F1>
<DISTRIBUTIONS-OF-GAINS> (27)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 54<F1>
<NUMBER-OF-SHARES-REDEEMED> (52)<F1>
<SHARES-REINVESTED> 6<F1>
<NET-CHANGE-IN-ASSETS> (2621)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1504
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 19<F1>
<AVERAGE-NET-ASSETS> 2173<F1>
<PER-SHARE-NAV-BEGIN> 7.98<F1>
<PER-SHARE-NII> .15<F1>
<PER-SHARE-GAIN-APPREC> (.08)<F1>
<PER-SHARE-DIVIDEND> (.15)<F1>
<PER-SHARE-DISTRIBUTIONS> (.10)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.80<F1>
<EXPENSE-RATIO> 1.74<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>101
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MISSOURI CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 46071
<INVESTMENTS-AT-VALUE> 48710
<RECEIVABLES> 939
<ASSETS-OTHER> 89
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 49739
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 169
<TOTAL-LIABILITIES> 169
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 46929
<SHARES-COMMON-STOCK> 6297<F1>
<SHARES-COMMON-PRIOR> 6223<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2639
<NET-ASSETS> 48944<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1304<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (223)<F1>
<NET-INVESTMENT-INCOME> 1081<F1>
<REALIZED-GAINS-CURRENT> 9
<APPREC-INCREASE-CURRENT> (866)
<NET-CHANGE-FROM-OPS> 232
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1081)<F1>
<DISTRIBUTIONS-OF-GAINS> (737)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 139<F1>
<NUMBER-OF-SHARES-REDEEMED> (197)<F1>
<SHARES-REINVESTED> 132<F1>
<NET-CHANGE-IN-ASSETS> (797)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 736
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 123<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 223<F1>
<AVERAGE-NET-ASSETS> 49368<F1>
<PER-SHARE-NAV-BEGIN> 8.03<F1>
<PER-SHARE-NII> .17<F1>
<PER-SHARE-GAIN-APPREC> (.14)<F1>
<PER-SHARE-DIVIDEND> (.17)<F1>
<PER-SHARE-DISTRIBUTIONS> (.12)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.77<F1>
<EXPENSE-RATIO> .90<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>104
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MISSOURI CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 46071
<INVESTMENTS-AT-VALUE> 48710
<RECEIVABLES> 939
<ASSETS-OTHER> 89
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 49739
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 169
<TOTAL-LIABILITIES> 169
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 46929
<SHARES-COMMON-STOCK> 81<F1>
<SHARES-COMMON-PRIOR> 52<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 2
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2639
<NET-ASSETS> 626<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 12<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (4)<F1>
<NET-INVESTMENT-INCOME> 8<F1>
<REALIZED-GAINS-CURRENT> 9
<APPREC-INCREASE-CURRENT> (866)
<NET-CHANGE-FROM-OPS> 232
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (8)<F1>
<DISTRIBUTIONS-OF-GAINS> (6)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 29<F1>
<NUMBER-OF-SHARES-REDEEMED> (2)<F1>
<SHARES-REINVESTED> 2<F1>
<NET-CHANGE-IN-ASSETS> (797)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 736
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4<F1>
<AVERAGE-NET-ASSETS> 471<F1>
<PER-SHARE-NAV-BEGIN> 8.03<F1>
<PER-SHARE-NII> .14<F1>
<PER-SHARE-GAIN-APPREC> (.14)<F1>
<PER-SHARE-DIVIDEND> (.14)<F1>
<PER-SHARE-DISTRIBUTIONS> (.12)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.77<F1>
<EXPENSE-RATIO> 1.80<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>051
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NEW YORK CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 80314
<INVESTMENTS-AT-VALUE> 85736
<RECEIVABLES> 2662
<ASSETS-OTHER> 150
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 88549
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 281
<TOTAL-LIABILITIES> 281
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 82799
<SHARES-COMMON-STOCK> 10311<F1>
<SHARES-COMMON-PRIOR> 9867<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 47
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5422
<NET-ASSETS> 84971<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2251<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (350)<F1>
<NET-INVESTMENT-INCOME> 1901<F1>
<REALIZED-GAINS-CURRENT> 55
<APPREC-INCREASE-CURRENT> (1598)
<NET-CHANGE-FROM-OPS> 404
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1901)<F1>
<DISTRIBUTIONS-OF-GAINS> (2032)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 866<F1>
<NUMBER-OF-SHARES-REDEEMED> (755)<F1>
<SHARES-REINVESTED> 333<F1>
<NET-CHANGE-IN-ASSETS> 1264
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2079
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 211<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 350<F1>
<AVERAGE-NET-ASSETS> 84622<F1>
<PER-SHARE-NAV-BEGIN> 8.60<F1>
<PER-SHARE-NII> .19<F1>
<PER-SHARE-GAIN-APPREC> (.15)<F1>
<PER-SHARE-DIVIDEND> (.19)<F1>
<PER-SHARE-DISTRIBUTIONS> (.21)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.24<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>054
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NEW YORK CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 80314
<INVESTMENTS-AT-VALUE> 85736
<RECEIVABLES> 2662
<ASSETS-OTHER> 150
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 88549
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 281
<TOTAL-LIABILITIES> 281
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 82799
<SHARES-COMMON-STOCK> 400<F1>
<SHARES-COMMON-PRIOR> 253<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 47
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 5422
<NET-ASSETS> 3297<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 69<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (22)<F1>
<NET-INVESTMENT-INCOME> 47<F1>
<REALIZED-GAINS-CURRENT> 55
<APPREC-INCREASE-CURRENT> (1598)
<NET-CHANGE-FROM-OPS> 404
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (47)<F1>
<DISTRIBUTIONS-OF-GAINS> (55)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 144<F1>
<NUMBER-OF-SHARES-REDEEMED> (7)<F1>
<SHARES-REINVESTED> 10<F1>
<NET-CHANGE-IN-ASSETS> 1264
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2079
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 7<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 22<F1>
<AVERAGE-NET-ASSETS> 2614<F1>
<PER-SHARE-NAV-BEGIN> 8.60<F1>
<PER-SHARE-NII> .15<F1>
<PER-SHARE-GAIN-APPREC> (.14)<F1>
<PER-SHARE-DIVIDEND> (.15)<F1>
<PER-SHARE-DISTRIBUTIONS> (.21)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.25<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>061
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OHIO CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 140109
<INVESTMENTS-AT-VALUE> 149025
<RECEIVABLES> 2531
<ASSETS-OTHER> 152
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 151710
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 864
<TOTAL-LIABILITIES> 864
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 141885
<SHARES-COMMON-STOCK> 18387<F1>
<SHARES-COMMON-PRIOR> 18304<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 44
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8916
<NET-ASSETS> 149197<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4175<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (609)<F1>
<NET-INVESTMENT-INCOME> 3566<F1>
<REALIZED-GAINS-CURRENT> 68
<APPREC-INCREASE-CURRENT> (2279)
<NET-CHANGE-FROM-OPS> 1380
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3566)<F1>
<DISTRIBUTIONS-OF-GAINS> (2413)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 271<F1>
<NUMBER-OF-SHARES-REDEEMED> (677)<F1>
<SHARES-REINVESTED> 489<F1>
<NET-CHANGE-IN-ASSETS> (3383)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2407
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 377<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 609<F1>
<AVERAGE-NET-ASSETS> 150940<F1>
<PER-SHARE-NAV-BEGIN> 8.37<F1>
<PER-SHARE-NII> .19<F1>
<PER-SHARE-GAIN-APPREC> (.13)<F1>
<PER-SHARE-DIVIDEND> (.19)<F1>
<PER-SHARE-DISTRIBUTIONS> (.13)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.11<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>064
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OHIO CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 140109
<INVESTMENTS-AT-VALUE> 149025
<RECEIVABLES> 2531
<ASSETS-OTHER> 152
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 151710
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 864
<TOTAL-LIABILITIES> 864
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 141885
<SHARES-COMMON-STOCK> 202<F1>
<SHARES-COMMON-PRIOR> 131<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 44
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8916
<NET-ASSETS> 1649<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 36<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (11)<F1>
<NET-INVESTMENT-INCOME> 25<F1>
<REALIZED-GAINS-CURRENT> 68
<APPREC-INCREASE-CURRENT> (2279)
<NET-CHANGE-FROM-OPS> 1380
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (25)<F1>
<DISTRIBUTIONS-OF-GAINS> (18)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 100<F1>
<NUMBER-OF-SHARES-REDEEMED> (34)<F1>
<SHARES-REINVESTED> 5<F1>
<NET-CHANGE-IN-ASSETS> (3383)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2407
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11<F1>
<AVERAGE-NET-ASSETS> 1296<F1>
<PER-SHARE-NAV-BEGIN> 8.41<F1>
<PER-SHARE-NII> .16<F1>
<PER-SHARE-GAIN-APPREC> (.13)<F1>
<PER-SHARE-DIVIDEND> (.16)<F1>
<PER-SHARE-DISTRIBUTIONS> (.13)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.15<F1>
<EXPENSE-RATIO> 1.71<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>114
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OREGON CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 56495
<INVESTMENTS-AT-VALUE> 60025
<RECEIVABLES> 1077
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 4
<TOTAL-ASSETS> 61106
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 371
<TOTAL-LIABILITIES> 371
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 56977
<SHARES-COMMON-STOCK> 351<F1>
<SHARES-COMMON-PRIOR> 329<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 228
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3530
<NET-ASSETS> 2778<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 71<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (24)<F1>
<NET-INVESTMENT-INCOME> 47<F1>
<REALIZED-GAINS-CURRENT> 232
<APPREC-INCREASE-CURRENT> (825)
<NET-CHANGE-FROM-OPS> 729
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (47)<F1>
<DISTRIBUTIONS-OF-GAINS> (16)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 40<F1>
<NUMBER-OF-SHARES-REDEEMED> (23)<F1>
<SHARES-REINVESTED> 5<F1>
<NET-CHANGE-IN-ASSETS> 484
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 371
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 24<F1>
<AVERAGE-NET-ASSETS> 2675F1>
<PER-SHARE-NAV-BEGIN> 8.04<F1>
<PER-SHARE-NII> .14<F1>
<PER-SHARE-GAIN-APPREC> (.08)<F1>
<PER-SHARE-DIVIDEND> (.14)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.91<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>151
<NAME> SELIGMAN MUNICIPAL FUND SERIES-SOUTH CAROLINA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 102849
<INVESTMENTS-AT-VALUE> 109420
<RECEIVABLES> 1941
<ASSETS-OTHER> 127
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 111489
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 465
<TOTAL-LIABILITIES> 465
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 104463
<SHARES-COMMON-STOCK> 12774<F1>
<SHARES-COMMON-PRIOR> 12682<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6571
<NET-ASSETS> 104543<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2814<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (439)<F1>
<NET-INVESTMENT-INCOME> 2375<F1>
<REALIZED-GAINS-CURRENT> 146
<APPREC-INCREASE-CURRENT> (1951)
<NET-CHANGE-FROM-OPS> 674
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2375)<F1>
<DISTRIBUTIONS-OF-GAINS> (835)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 496<F1>
<NUMBER-OF-SHARES-REDEEMED> (646)<F1>
<SHARES-REINVESTED> 242<F1>
<NET-CHANGE-IN-ASSETS> (898)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 724
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 262<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 439<F1>
<AVERAGE-NET-ASSETS> 105182<F1>
<PER-SHARE-NAV-BEGIN> 8.38<F1>
<PER-SHARE-NII> .19<F1>
<PER-SHARE-GAIN-APPREC> (.13)<F1>
<PER-SHARE-DIVIDEND> (.19)<F1>
<PER-SHARE-DISTRIBUTIONS> (.07)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.18<F1>
<EXPENSE-RATIO> .83<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>154
<NAME> SELIGMAN MUNICIPAL FUND SERIES-SOUTH CAROLINA CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 102849
<INVESTMENTS-AT-VALUE> 109420
<RECEIVABLES> 1941
<ASSETS-OTHER> 127
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 111489
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 465
<TOTAL-LIABILITIES> 465
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 104463
<SHARES-COMMON-STOCK> 793<F1>
<SHARES-COMMON-PRIOR> 668<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 6571
<NET-ASSETS> 6481<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 154<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (50)<F1>
<NET-INVESTMENT-INCOME> 104<F1>
<REALIZED-GAINS-CURRENT> 146
<APPREC-INCREASE-CURRENT> (1951)
<NET-CHANGE-FROM-OPS> 674
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (104)<F1>
<DISTRIBUTIONS-OF-GAINS> (45)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 153<F1>
<NUMBER-OF-SHARES-REDEEMED> (42)<F1>
<SHARES-REINVESTED> 14<F1>
<NET-CHANGE-IN-ASSETS> (898)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 724
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 15<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 50<F1>
<AVERAGE-NET-ASSETS> 5766<F1>
<PER-SHARE-NAV-BEGIN> 8.38<F1>
<PER-SHARE-NII> .15<F1>
<PER-SHARE-GAIN-APPREC> (.13)<F1>
<PER-SHARE-DIVIDEND> (.15)<F1>
<PER-SHARE-DISTRIBUTIONS> (.07)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.18<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>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>111
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OREGON CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> MAR-31-1999
<INVESTMENTS-AT-COST> 56495
<INVESTMENTS-AT-VALUE> 60025
<RECEIVABLES> 1077
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 4
<TOTAL-ASSETS> 61106
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 371
<TOTAL-LIABILITIES> 371
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 56977
<SHARES-COMMON-STOCK> 7320<F1>
<SHARES-COMMON-PRIOR> 7159<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 228
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3530
<NET-ASSETS> 57957<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1531<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (256)<F1>
<NET-INVESTMENT-INCOME> 1275<F1>
<REALIZED-GAINS-CURRENT> 232
<APPREC-INCREASE-CURRENT> (825)
<NET-CHANGE-FROM-OPS> 729
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1275)<F1>
<DISTRIBUTIONS-OF-GAINS> (359)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 532<F1>
<NUMBER-OF-SHARES-REDEEMED> (507)<F1>
<SHARES-REINVESTED> 136<F1>
<NET-CHANGE-IN-ASSETS> 484
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 371
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 145<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 256<F1>
<AVERAGE-NET-ASSETS> 58047<F1>
<PER-SHARE-NAV-BEGIN> 8.05<F1>
<PER-SHARE-NII> .17<F1>
<PER-SHARE-GAIN-APPREC> (.08)<F1>
<PER-SHARE-DIVIDEND> (.17)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.92<F1>
<EXPENSE-RATIO> .88<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
