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<PAGE> PAGE 22
042 E000500 0
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070 H010500 N
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<PAGE> PAGE 23
070 J020500 N
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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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072 Q001000 0
072 R001000 19
072 S001000 5
072 T001000 52
072 U001000 0
072 V001000 0
072 W001000 2
072 X001000 429
072 Y001000 0
072 Z001000 2172
072AA001000 202
072BB001000 152
072CC011000 0
072CC021000 3922
072DD011000 2152
072DD021000 20
072EE001000 743
073 A011000 0.3485
073 A021000 0.2780
073 B001000 0.1180
073 C001000 0.0000
074 A001000 146
074 B001000 0
074 C001000 900
074 D001000 42440
074 E001000 0
074 F001000 0
074 G001000 0
074 H001000 0
074 I001000 0
074 J001000 0
074 K001000 6
074 L001000 874
074 M001000 0
074 N001000 44366
074 O001000 0
074 P001000 21
074 Q001000 0
074 R011000 0
074 R021000 0
074 R031000 0
074 R041000 270
074 S001000 0
074 T001000 44075
074 U011000 5960
074 U021000 85
074 V011000 7.29
074 V021000 7.29
<PAGE> PAGE 43
074 W001000 0.0000
074 X001000 1301
074 Y001000 0
075 A001000 0
075 B001000 44566
076 001000 0.00
028 A011100 367
028 A021100 152
028 A031100 0
028 A041100 623
028 B011100 319
028 B021100 137
028 B031100 0
028 B041100 719
028 C011100 420
028 C021100 147
028 C031100 0
028 C041100 366
028 D011100 351
028 D021100 146
028 D031100 0
028 D041100 528
028 E011100 428
028 E021100 138
028 E031100 0
028 E041100 582
028 F011100 331
028 F021100 151
028 F031100 0
028 F041100 973
028 G011100 2216
028 G021100 871
028 G031100 0
028 G041100 3791
028 H001100 1362
029 001100 Y
030 A001100 142
030 B001100 4.75
030 C001100 1.00
031 A001100 17
031 B001100 0
032 001100 122
033 001100 3
034 001100 Y
035 001100 3
036 A001100 N
036 B001100 0
042 A001100 0
042 B001100 0
042 C001100 0
042 D001100 100
<PAGE> PAGE 44
042 E001100 0
042 F001100 0
042 G001100 0
042 H001100 0
043 001100 84
044 001100 0
055 A001100 Y
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 0.9
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 1.7
062 M001100 0.0
062 N001100 0.0
062 O001100 97.4
062 P001100 0.0
062 Q001100 0.0
062 R001100 0.0
063 A001100 0
063 B001100 17.6
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
<PAGE> PAGE 45
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 8178
071 B001100 7169
071 C001100 58387
071 D001100 12
072 A001100 12
072 B001100 3216
072 C001100 0
072 D001100 0
072 E001100 0
072 F001100 299
072 G001100 0
072 H001100 0
072 I001100 82
072 J001100 12
072 K001100 6
072 L001100 7
072 M001100 7
072 N001100 5
072 O001100 1
072 P001100 0
072 Q001100 0
072 R001100 21
072 S001100 12
072 T001100 84
072 U001100 0
072 V001100 0
072 W001100 2
072 X001100 538
072 Y001100 0
072 Z001100 2678
072AA001100 407
072BB001100 23
072CC011100 0
072CC021100 4304
<PAGE> PAGE 46
072DD011100 2585
072DD021100 93
072EE001100 375
073 A011100 0.3555
073 A021100 0.2844
073 B001100 0.0500
073 C001100 0.0000
074 A001100 72
074 B001100 0
074 C001100 500
074 D001100 55208
074 E001100 0
074 F001100 0
074 G001100 0
074 H001100 0
074 I001100 0
074 J001100 140
074 K001100 8
074 L001100 1054
074 M001100 0
074 N001100 56982
074 O001100 0
074 P001100 29
074 Q001100 0
074 R011100 0
074 R021100 0
074 R031100 0
074 R041100 249
074 S001100 0
074 T001100 56704
074 U011100 7281
074 U021100 298
074 V011100 7.48
074 V021100 7.48
074 W001100 0.0000
074 X001100 1538
074 Y001100 0
075 A001100 0
075 B001100 55158
076 001100 0.00
028 A011300 553
028 A021300 131
028 A031300 0
028 A041300 499
028 B011300 173
028 B021300 121
028 B031300 0
028 B041300 263
028 C011300 416
028 C021300 128
028 C031300 0
<PAGE> PAGE 47
028 C041300 645
028 D011300 247
028 D021300 129
028 D031300 0
028 D041300 661
028 E011300 257
028 E021300 100
028 E031300 0
028 E041300 1260
028 F011300 161
028 F021300 109
028 F031300 0
028 F041300 844
028 G011300 1807
028 G021300 718
028 G031300 0
028 G041300 4172
028 H001300 1044
029 001300 Y
030 A001300 82
030 B001300 4.75
030 C001300 1.00
031 A001300 9
031 B001300 0
032 001300 71
033 001300 2
034 001300 Y
035 001300 2
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 75
044 001300 0
055 A001300 Y
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 0.0
062 F001300 0.0
062 G001300 0.0
<PAGE> PAGE 48
062 H001300 0.0
062 I001300 0.0
062 J001300 0.0
062 K001300 0.0
062 L001300 1.7
062 M001300 0.0
062 N001300 0.0
062 O001300 98.3
062 P001300 0.0
062 Q001300 0.0
062 R001300 0.0
063 A001300 0
063 B001300 20.7
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
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
<PAGE> PAGE 49
071 A001300 11587
071 B001300 13069
071 C001300 48415
071 D001300 24
072 A001300 12
072 B001300 2701
072 C001300 0
072 D001300 0
072 E001300 0
072 F001300 248
072 G001300 0
072 H001300 0
072 I001300 72
072 J001300 9
072 K001300 6
072 L001300 8
072 M001300 7
072 N001300 5
072 O001300 1
072 P001300 0
072 Q001300 0
072 R001300 19
072 S001300 2
072 T001300 75
072 U001300 0
072 V001300 0
072 W001300 2
072 X001300 454
072 Y001300 0
072 Z001300 2247
072AA001300 884
072BB001300 0
072CC011300 0
072CC021300 4442
072DD011300 2146
072DD021300 99
072EE001300 272
073 A011300 0.3757
073 A021300 0.3027
073 B001300 0.0450
073 C001300 0.0000
074 A001300 100
074 B001300 0
074 C001300 0
074 D001300 44420
074 E001300 0
074 F001300 0
074 G001300 0
074 H001300 0
074 I001300 0
074 J001300 0
<PAGE> PAGE 50
074 K001300 6
074 L001300 840
074 M001300 1
074 N001300 45367
074 O001300 0
074 P001300 21
074 Q001300 0
074 R011300 0
074 R021300 0
074 R031300 0
074 R041300 160
074 S001300 0
074 T001300 45186
074 U011300 5510
074 U021300 299
074 V011300 7.75
074 V021300 7.76
074 W001300 0.0000
074 X001300 1040
074 Y001300 0
075 A001300 0
075 B001300 45692
076 001300 0.00
028 A011500 -2201
028 A021500 259
028 A031500 0
028 A041500 -1581
028 B011500 747
028 B021500 235
028 B031500 0
028 B041500 1021
028 C011500 806
028 C021500 249
028 C031500 0
028 C041500 2743
028 D011500 923
028 D021500 254
028 D031500 0
028 D041500 1771
028 E011500 575
028 E021500 216
028 E031500 0
028 E041500 1524
028 F011500 164
028 F021500 235
028 F031500 0
028 F041500 2051
028 G011500 1014
028 G021500 1448
028 G031500 0
028 G041500 7529
<PAGE> PAGE 51
028 H001500 1014
029 001500 Y
030 A001500 158
030 B001500 4.75
030 C001500 1.00
031 A001500 19
031 B001500 0
032 001500 130
033 001500 9
034 001500 Y
035 001500 7
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 165
044 001500 0
055 A001500 Y
055 B001500 N
056 001500 Y
057 001500 N
062 A001500 Y
062 B001500 0.0
062 C001500 0.0
062 D001500 0.0
062 E001500 0.4
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 1.7
062 M001500 0.0
062 N001500 0.0
062 O001500 97.9
062 P001500 0.0
062 Q001500 0.0
062 R001500 0.0
063 A001500 0
063 B001500 21.6
064 A001500 Y
064 B001500 N
070 A011500 Y
070 A021500 N
<PAGE> PAGE 52
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
070 N021500 N
070 O011500 N
070 O021500 N
070 P011500 Y
070 P021500 Y
070 Q011500 N
070 Q021500 N
070 R011500 N
070 R021500 N
071 A001500 19018
071 B001500 22448
071 C001500 105285
071 D001500 18
072 A001500 12
072 B001500 5945
072 C001500 0
072 D001500 0
072 E001500 0
072 F001500 542
072 G001500 0
072 H001500 0
072 I001500 146
072 J001500 25
072 K001500 6
072 L001500 15
072 M001500 8
<PAGE> PAGE 53
072 N001500 6
072 O001500 1
072 P001500 0
072 Q001500 0
072 R001500 30
072 S001500 3
072 T001500 165
072 U001500 0
072 V001500 0
072 W001500 3
072 X001500 952
072 Y001500 0
072 Z001500 4993
072AA001500 999
072BB001500 30
072CC011500 0
072CC021500 9667
072DD011500 4762
072DD021500 231
072EE001500 880
073 A011500 0.3792
073 A021500 0.3051
073 B001500 0.0660
073 C001500 0.0000
074 A001500 144
074 B001500 0
074 C001500 400
074 D001500 96986
074 E001500 0
074 F001500 0
074 G001500 0
074 H001500 0
074 I001500 0
074 J001500 0
074 K001500 13
074 L001500 1834
074 M001500 1
074 N001500 99378
074 O001500 0
074 P001500 49
074 Q001500 0
074 R011500 0
074 R021500 0
074 R031500 0
074 R041500 265
074 S001500 0
074 T001500 99064
074 U011500 12104
074 U021500 775
074 V011500 7.67
074 V021500 7.66
<PAGE> PAGE 54
074 W001500 0.0000
074 X001500 2062
074 Y001500 0
075 A001500 0
075 B001500 100030
076 001500 0.00
SIGNATURE THOMAS G. ROSE
TITLE TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>011
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NATIONAL CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 98031
<INVESTMENTS-AT-VALUE> 97252
<RECEIVABLES> 1508
<ASSETS-OTHER> 78
<OTHER-ITEMS-ASSETS> 9
<TOTAL-ASSETS> 98847
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 357
<TOTAL-LIABILITIES> 357
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 100617
<SHARES-COMMON-STOCK> 11764<F1>
<SHARES-COMMON-PRIOR> 12255<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1347)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (779)
<NET-ASSETS> 90296<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5593<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (826)<F1>
<NET-INVESTMENT-INCOME> 4767<F1>
<REALIZED-GAINS-CURRENT> 212
<APPREC-INCREASE-CURRENT> (8530)
<NET-CHANGE-FROM-OPS> (3293)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4767)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2559<F1>
<NUMBER-OF-SHARES-REDEEMED> (3377)<F1>
<SHARES-REINVESTED> 327<F1>
<NET-CHANGE-IN-ASSETS> (10811)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (1559)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 494<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 826<F1>
<AVERAGE-NET-ASSETS> 98872<F1>
<PER-SHARE-NAV-BEGIN> 8.32<F1>
<PER-SHARE-NII> .39<F1>
<PER-SHARE-GAIN-APPREC> (.64)<F1>
<PER-SHARE-DIVIDEND> (.39)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.68<F1>
<EXPENSE-RATIO> .83<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>013
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NATIONAL CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 98031
<INVESTMENTS-AT-VALUE> 97252
<RECEIVABLES> 1508
<ASSETS-OTHER> 78
<OTHER-ITEMS-ASSETS> 9
<TOTAL-ASSETS> 98847
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 357
<TOTAL-LIABILITIES> 357
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 100617
<SHARES-COMMON-STOCK> 15<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1347)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (779)
<NET-ASSETS> 115<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 1<F1>
<REALIZED-GAINS-CURRENT> 212
<APPREC-INCREASE-CURRENT> (8530)
<NET-CHANGE-FROM-OPS> (3293)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 15<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (10811)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (1559)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 70<F1>
<PER-SHARE-NAV-BEGIN> 8.08<F1>
<PER-SHARE-NII> .11<F1>
<PER-SHARE-GAIN-APPREC> (.40)<F1>
<PER-SHARE-DIVIDEND> (.11)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.68<F1>
<EXPENSE-RATIO> 1.74<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>014
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NATIONAL CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 98031
<INVESTMENTS-AT-VALUE> 97252
<RECEIVABLES> 1508
<ASSETS-OTHER> 78
<OTHER-ITEMS-ASSETS> 9
<TOTAL-ASSETS> 98847
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 357
<TOTAL-LIABILITIES> 357
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 100617
<SHARES-COMMON-STOCK> 1053<F1>
<SHARES-COMMON-PRIOR> 889<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (1347)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (779)
<NET-ASSETS> 8079<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 370<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (113)<F1>
<NET-INVESTMENT-INCOME> 257<F1>
<REALIZED-GAINS-CURRENT> 212
<APPREC-INCREASE-CURRENT> (8530)
<NET-CHANGE-FROM-OPS> (3293)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (257)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 821<F1>
<NUMBER-OF-SHARES-REDEEMED> (679)<F1>
<SHARES-REINVESTED> 22<F1>
<NET-CHANGE-IN-ASSETS> (10811)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (1559)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 33<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 113<F1>
<AVERAGE-NET-ASSETS> 6527<F1>
<PER-SHARE-NAV-BEGIN> 8.31<F1>
<PER-SHARE-NII> .32<F1>
<PER-SHARE-GAIN-APPREC> (.63)<F1>
<PER-SHARE-DIVIDEND> (.32)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.68<F1>
<EXPENSE-RATIO> 1.73<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>091
<NAME> SELIGMAN MUNICIPAL FUND SERIES - COLORADO CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 45464
<INVESTMENTS-AT-VALUE> 44805
<RECEIVABLES> 878
<ASSETS-OTHER> 78
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 45762
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 136
<TOTAL-LIABILITIES> 1356
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 45971
<SHARES-COMMON-STOCK> 6292<F1>
<SHARES-COMMON-PRIOR> 5968<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 315
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (659)
<NET-ASSETS> 44649<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2549<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (408)<F1>
<NET-INVESTMENT-INCOME> 2141<F1>
<REALIZED-GAINS-CURRENT> 431
<APPREC-INCREASE-CURRENT> (3920)
<NET-CHANGE-FROM-OPS> (1318)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2141)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1357<F1>
<NUMBER-OF-SHARES-REDEEMED> (1198)<F1>
<SHARES-REINVESTED> 165<F1>
<NET-CHANGE-IN-ASSETS> (301)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (116)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 233<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 408<F1>
<AVERAGE-NET-ASSETS> 46578<F1>
<PER-SHARE-NAV-BEGIN> 7.64<F1>
<PER-SHARE-NII> .34<F1>
<PER-SHARE-GAIN-APPREC> (.54)<F1>
<PER-SHARE-DIVIDEND> (.34)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.10<F1>
<EXPENSE-RATIO> .87<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>093
<NAME> SELIGMAN MUNICIPAL FUND SERIES - COLORADO CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 45464
<INVESTMENTS-AT-VALUE> 44805
<RECEIVABLES> 878
<ASSETS-OTHER> 78
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 45762
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 136
<TOTAL-LIABILITIES> 1356
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 45971
<SHARES-COMMON-STOCK> 8<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 315
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (659)
<NET-ASSETS> 60<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 1<F1>
<REALIZED-GAINS-CURRENT> 431
<APPREC-INCREASE-CURRENT> (3920)
<NET-CHANGE-FROM-OPS> (1318)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 29<F1>
<NUMBER-OF-SHARES-REDEEMED> (21)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (301)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (116)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 48<F1>
<PER-SHARE-NAV-BEGIN> 7.47<F1>
<PER-SHARE-NII> .10<F1>
<PER-SHARE-GAIN-APPREC> (.38)<F1>
<PER-SHARE-DIVIDEND> (.10)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.09<F1>
<EXPENSE-RATIO> 1.73<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>094
<NAME> SELIGMAN MUNICIPAL FUND SERIES - COLORADO CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 45464
<INVESTMENTS-AT-VALUE> 44805
<RECEIVABLES> 878
<ASSETS-OTHER> 78
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 45762
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 136
<TOTAL-LIABILITIES> 136
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 45971
<SHARES-COMMON-STOCK> 129<F1>
<SHARES-COMMON-PRIOR> 45<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 315
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (659)
<NET-ASSETS> 917<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 44<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (14)<F1>
<NET-INVESTMENT-INCOME> 30<F1>
<REALIZED-GAINS-CURRENT> 431
<APPREC-INCREASE-CURRENT> (3920)
<NET-CHANGE-FROM-OPS> (1318)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (30)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 96<F1>
<NUMBER-OF-SHARES-REDEEMED> (14)<F1>
<SHARES-REINVESTED> 2<F1>
<NET-CHANGE-IN-ASSETS> (301)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (116)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 14<F1>
<AVERAGE-NET-ASSETS> 800<F1>
<PER-SHARE-NAV-BEGIN> 7.63<F1>
<PER-SHARE-NII> .28<F1>
<PER-SHARE-GAIN-APPREC> (.54)<F1>
<PER-SHARE-DIVIDEND> (.28)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.09<F1>
<EXPENSE-RATIO> 1.77<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>131
<NAME> SELIGMAN MUNICIPAL FUND SERIES-GEORGIA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 44262
<INVESTMENTS-AT-VALUE> 44420
<RECEIVABLES> 846
<ASSETS-OTHER> 99
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 45366
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 181
<TOTAL-LIABILITIES> 181
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 44148
<SHARES-COMMON-STOCK> 5510<F1>
<SHARES-COMMON-PRIOR> 5777<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 879
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 158
<NET-ASSETS> 42692<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2551<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (405)<F1>
<NET-INVESTMENT-INCOME> 2146<F1>
<REALIZED-GAINS-CURRENT> 884
<APPREC-INCREASE-CURRENT> (4442)
<NET-CHANGE-FROM-OPS> (1311)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2146)<F1>
<DISTRIBUTIONS-OF-GAINS> (257)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 424<F1>
<NUMBER-OF-SHARES-REDEEMED> (884)<F1>
<SHARES-REINVESTED> 193<F1>
<NET-CHANGE-IN-ASSETS> (6047)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 267
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 234<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 405<F1>
<AVERAGE-NET-ASSETS> 46783<F1>
<PER-SHARE-NAV-BEGIN> 8.38<F1>
<PER-SHARE-NII> .37<F1>
<PER-SHARE-GAIN-APPREC> (.58)<F1>
<PER-SHARE-DIVIDEND> (.37)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.75<F1>
<EXPENSE-RATIO> .87<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>133
<NAME> SELIGMAN MUNICIPAL FUND SERIES-GEORGIA CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 44262
<INVESTMENTS-AT-VALUE> 44420
<RECEIVABLES> 846
<ASSETS-OTHER> 99
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 45366
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 181
<TOTAL-LIABILITIES> 181
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 44148
<SHARES-COMMON-STOCK> 23<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 879
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 158
<NET-ASSETS> 176<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1)<F1>
<NET-INVESTMENT-INCOME> 2<F1>
<REALIZED-GAINS-CURRENT> 884
<APPREC-INCREASE-CURRENT> (4442)
<NET-CHANGE-FROM-OPS> (1311)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 23<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (6047)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 267
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1<F1>
<AVERAGE-NET-ASSETS> 140<F1>
<PER-SHARE-NAV-BEGIN> 8.17<F1>
<PER-SHARE-NII> .11<F1>
<PER-SHARE-GAIN-APPREC> (.41)<F1>
<PER-SHARE-DIVIDEND> (.11)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.76<F1>
<EXPENSE-RATIO> 1.74<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>134
<NAME> SELIGMAN MUNICIPAL FUND SERIES-GEORGIA CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 44262
<INVESTMENTS-AT-VALUE> 44420
<RECEIVABLES> 846
<ASSETS-OTHER> 99
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 45366
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 181
<TOTAL-LIABILITIES> 181
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 44148
<SHARES-COMMON-STOCK> 299<F1>
<SHARES-COMMON-PRIOR> 334<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 879
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 158
<NET-ASSETS> 2318<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 147<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (48)<F1>
<NET-INVESTMENT-INCOME> 99<F1>
<REALIZED-GAINS-CURRENT> 884
<APPREC-INCREASE-CURRENT> (4442)
<NET-CHANGE-FROM-OPS> (1311)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (99)<F1>
<DISTRIBUTIONS-OF-GAINS> (15)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 68<F1>
<NUMBER-OF-SHARES-REDEEMED> (114)<F1>
<SHARES-REINVESTED> 11<F1>
<NET-CHANGE-IN-ASSETS> (6047)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 267
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 13<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 48<F1>
<AVERAGE-NET-ASSETS> 2693<F1>
<PER-SHARE-NAV-BEGIN> 8.40<F1>
<PER-SHARE-NII> .30<F1>
<PER-SHARE-GAIN-APPREC> (.59)<F1>
<PER-SHARE-DIVIDEND> (.30)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.76<F1>
<EXPENSE-RATIO> 1.77<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>071
<NAME> SELIGMAN MUNICIPAL FUND SERIES-LOUISIANA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 51554
<INVESTMENTS-AT-VALUE> 51568
<RECEIVABLES> 1055
<ASSETS-OTHER> 59
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 52683
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 232
<TOTAL-LIABILITIES> 232
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 52138
<SHARES-COMMON-STOCK> 6603<F1>
<SHARES-COMMON-PRIOR> 6619<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 298
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 14
<NET-ASSETS> 51543<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3053<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (460)<F1>
<NET-INVESTMENT-INCOME> 2593<F1>
<REALIZED-GAINS-CURRENT> 303
<APPREC-INCREASE-CURRENT> (4254)
<NET-CHANGE-FROM-OPS> (1326)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2593)<F1>
<DISTRIBUTIONS-OF-GAINS> (742)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 295<F1>
<NUMBER-OF-SHARES-REDEEMED> (524)<F1>
<SHARES-REINVESTED> 213<F1>
<NET-CHANGE-IN-ASSETS> (4694)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 748
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 273<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 460<F1>
<AVERAGE-NET-ASSETS> 54478<F1>
<PER-SHARE-NAV-BEGIN> 8.51<F1>
<PER-SHARE-NII> .39<F1>
<PER-SHARE-GAIN-APPREC> (.59)<F1>
<PER-SHARE-DIVIDEND> (.39)<F1>
<PER-SHARE-DISTRIBUTIONS> (.11)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.81<F1>
<EXPENSE-RATIO> .84<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>073
<NAME> SELIGMAN MUNICIPAL FUND SERIES-LOUISIANA CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 51554
<INVESTMENTS-AT-VALUE> 51568
<RECEIVABLES> 1055
<ASSETS-OTHER> 59
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 52683
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 232
<TOTAL-LIABILITIES> 232
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 52138
<SHARES-COMMON-STOCK> 0<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 298
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 14
<NET-ASSETS> 0<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 0<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 0<F1>
<REALIZED-GAINS-CURRENT> 303
<APPREC-INCREASE-CURRENT> (4254)
<NET-CHANGE-FROM-OPS> (1326)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (4694)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 748
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 0<F1>
<PER-SHARE-NAV-BEGIN> 8.19<F1>
<PER-SHARE-NII> .11<F1>
<PER-SHARE-GAIN-APPREC> (.39)<F1>
<PER-SHARE-DIVIDEND> (.11)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.80<F1>
<EXPENSE-RATIO> 1.71<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>074
<NAME> SELIGMAN MUNICIPAL FUND SERIES-LOUISIANA CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 51554
<INVESTMENTS-AT-VALUE> 51568
<RECEIVABLES> 1055
<ASSETS-OTHER> 59
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 52683
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 232
<TOTAL-LIABILITIES> 232
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 52138
<SHARES-COMMON-STOCK> 116<F1>
<SHARES-COMMON-PRIOR> 99<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 298
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 14
<NET-ASSETS> 908<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 46<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (14)<F1>
<NET-INVESTMENT-INCOME> 32<F1>
<REALIZED-GAINS-CURRENT> 303
<APPREC-INCREASE-CURRENT> (4254)
<NET-CHANGE-FROM-OPS> (1326)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (32)<F1>
<DISTRIBUTIONS-OF-GAINS> (11)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 38<F1>
<NUMBER-OF-SHARES-REDEEMED> (24)<F1>
<SHARES-REINVESTED> 3<F1>
<NET-CHANGE-IN-ASSETS> (4694)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 748
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 14<F1>
<AVERAGE-NET-ASSETS> 833<F1>
<PER-SHARE-NAV-BEGIN> 8.50<F1>
<PER-SHARE-NII> .32<F1>
<PER-SHARE-GAIN-APPREC> (.59)<F1>
<PER-SHARE-DIVIDEND> (.32)<F1>
<PER-SHARE-DISTRIBUTIONS> (.11)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.80<F1>
<EXPENSE-RATIO> 1.74<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>081
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MARYLAND CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 50529
<INVESTMENTS-AT-VALUE> 51512
<RECEIVABLES> 926
<ASSETS-OTHER> 106
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 52545
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 172
<TOTAL-LIABILITIES> 172
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 51369
<SHARES-COMMON-STOCK> 6355<F1>
<SHARES-COMMON-PRIOR> 6598<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 20
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 983
<NET-ASSETS> 49523<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2994<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (464)<F1>
<NET-INVESTMENT-INCOME> 2530<F1>
<REALIZED-GAINS-CURRENT> 31
<APPREC-INCREASE-CURRENT> (3440)
<NET-CHANGE-FROM-OPS> 760
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2530)<F1>
<DISTRIBUTIONS-OF-GAINS> (185)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 251<F1>
<NUMBER-OF-SHARES-REDEEMED> (696)<F1>
<SHARES-REINVESTED> 202<F1>
<NET-CHANGE-IN-ASSETS> (5646)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 185
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 266<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 464<F1>
<AVERAGE-NET-ASSETS> 53067<F1>
<PER-SHARE-NAV-BEGIN> 8.32<F1>
<PER-SHARE-NII> .39<F1>
<PER-SHARE-GAIN-APPREC> (.50)<F1>
<PER-SHARE-DIVIDEND> (.39)<F1>
<PER-SHARE-DISTRIBUTIONS> (.03)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.79<F1>
<EXPENSE-RATIO> .87<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>083
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MARYLAND CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 50529
<INVESTMENTS-AT-VALUE> 51512
<RECEIVABLES> 926
<ASSETS-OTHER> 106
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 52545
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 172
<TOTAL-LIABILITIES> 172
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 51369
<SHARES-COMMON-STOCK> 10<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 20
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 983
<NET-ASSETS> 75<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1)<F1>
<NET-INVESTMENT-INCOME> 0<F1>
<REALIZED-GAINS-CURRENT> 31
<APPREC-INCREASE-CURRENT> (3440)
<NET-CHANGE-FROM-OPS> 760
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 10<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (5646)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 185
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 35<F1>
<PER-SHARE-NAV-BEGIN> 8.13<F1>
<PER-SHARE-NII> .11<F1>
<PER-SHARE-GAIN-APPREC> (.33)<F1>
<PER-SHARE-DIVIDEND> (.11)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.80<F1>
<EXPENSE-RATIO> 1.75<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>084
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MARYLAND CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 50529
<INVESTMENTS-AT-VALUE> 51512
<RECEIVABLES> 926
<ASSETS-OTHER> 106
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 52545
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 172
<TOTAL-LIABILITIES> 172
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 51369
<SHARES-COMMON-STOCK> 356<F1>
<SHARES-COMMON-PRIOR> 375<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 20
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 983
<NET-ASSETS> 2775<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 173<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (54)<F1>
<NET-INVESTMENT-INCOME> 119<F1>
<REALIZED-GAINS-CURRENT> 31
<APPREC-INCREASE-CURRENT> (3440)
<NET-CHANGE-FROM-OPS> 760
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (119)<F1>
<DISTRIBUTIONS-OF-GAINS> (11)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 66<F1>
<NUMBER-OF-SHARES-REDEEMED> (98)<F1>
<SHARES-REINVESTED> 13<F1>
<NET-CHANGE-IN-ASSETS> (5646)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 185
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 15<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 54<F1>
<AVERAGE-NET-ASSETS> 3072<F1>
<PER-SHARE-NAV-BEGIN> 8.33<F1>
<PER-SHARE-NII> .31<F1>
<PER-SHARE-GAIN-APPREC> (.50)<F1>
<PER-SHARE-DIVIDEND> (.31)<F1>
<PER-SHARE-DISTRIBUTIONS> (.03)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.80<F1>
<EXPENSE-RATIO> 1.77<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>021
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MASSACHUSETTS CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 100952
<INVESTMENTS-AT-VALUE> 99513
<RECEIVABLES> 1626
<ASSETS-OTHER> 138
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 101278
<PAYABLE-FOR-SECURITIES> 4840
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 347
<TOTAL-LIABILITIES> 5187
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 96988
<SHARES-COMMON-STOCK> 12444<F1>
<SHARES-COMMON-PRIOR> 13227<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 541
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1439)
<NET-ASSETS> 92929<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5547<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (855)<F1>
<NET-INVESTMENT-INCOME> 4692<F1>
<REALIZED-GAINS-CURRENT> 836
<APPREC-INCREASE-CURRENT> (10688)
<NET-CHANGE-FROM-OPS> (5067)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4692)<F1>
<DISTRIBUTIONS-OF-GAINS> (643)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3073<F1>
<NUMBER-OF-SHARES-REDEEMED> (4259)<F1>
<SHARES-REINVESTED> 403<F1>
<NET-CHANGE-IN-ASSETS> (14706)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 357
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 515<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 855<F1>
<AVERAGE-NET-ASSETS> 102825<F1>
<PER-SHARE-NAV-BEGIN> 8.27<F1>
<PER-SHARE-NII> .36<F1>
<PER-SHARE-GAIN-APPREC> (.75)<F1>
<PER-SHARE-DIVIDEND> (.36)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.47<F1>
<EXPENSE-RATIO> .83<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>023
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MASSACHUSETTS CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 100952
<INVESTMENTS-AT-VALUE> 99513
<RECEIVABLES> 1626
<ASSETS-OTHER> 138
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 101278
<PAYABLE-FOR-SECURITIES> 4840
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 347
<TOTAL-LIABILITIES> 5187
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 96988
<SHARES-COMMON-STOCK> 31<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 541
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1439)
<NET-ASSETS> 228<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1)<F1>
<NET-INVESTMENT-INCOME> 1<F1>
<REALIZED-GAINS-CURRENT> 836
<APPREC-INCREASE-CURRENT> (10688)
<NET-CHANGE-FROM-OPS> (5067)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 31<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (14706)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 357
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1<F1>
<AVERAGE-NET-ASSETS> 85<F1>
<PER-SHARE-NAV-BEGIN> 7.96<F1>
<PER-SHARE-NII> .10<F1>
<PER-SHARE-GAIN-APPREC> (.49)<F1>
<PER-SHARE-DIVIDEND> (.10)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.47<F1>
<EXPENSE-RATIO> 1.73<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>024
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MASSACHUSETTS CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 100952
<INVESTMENTS-AT-VALUE> 99513
<RECEIVABLES> 1626
<ASSETS-OTHER> 138
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 101278
<PAYABLE-FOR-SECURITIES> 4840
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 347
<TOTAL-LIABILITIES> 5187
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 96988
<SHARES-COMMON-STOCK> 393<F1>
<SHARES-COMMON-PRIOR> 178<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 541
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1439)
<NET-ASSETS> 2934<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 133<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (42)<F1>
<NET-INVESTMENT-INCOME> 91<F1>
<REALIZED-GAINS-CURRENT> 836
<APPREC-INCREASE-CURRENT> (10688)
<NET-CHANGE-FROM-OPS> (5067)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (91)<F1>
<DISTRIBUTIONS-OF-GAINS> (9)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 311<F1>
<NUMBER-OF-SHARES-REDEEMED> (103)<F1>
<SHARES-REINVESTED> 7<F1>
<NET-CHANGE-IN-ASSETS> (14706)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 357
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 12<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 42<F1>
<AVERAGE-NET-ASSETS> 2472<F1>
<PER-SHARE-NAV-BEGIN> 8.26<F1>
<PER-SHARE-NII> .29<F1>
<PER-SHARE-GAIN-APPREC> (.74)<F1>
<PER-SHARE-DIVIDEND> (.29)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.47<F1>
<EXPENSE-RATIO> 1.73<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>031
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MICHIGAN CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 126495
<INVESTMENTS-AT-VALUE> 126531
<RECEIVABLES> 2415
<ASSETS-OTHER> 129
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 129077
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1329
<TOTAL-LIABILITIES> 1329
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 127231
<SHARES-COMMON-STOCK> 15613<F1>
<SHARES-COMMON-PRIOR> 16333<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 482
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 36
<NET-ASSETS> 125560<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 7592<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1125)<F1>
<NET-INVESTMENT-INCOME> 6467<F1>
<REALIZED-GAINS-CURRENT> 617
<APPREC-INCREASE-CURRENT> (10841)
<NET-CHANGE-FROM-OPS> (3666)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6467)<F1>
<DISTRIBUTIONS-OF-GAINS> (2565)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 629<F1>
<NUMBER-OF-SHARES-REDEEMED> (2031)<F1>
<SHARES-REINVESTED> 682<F1>
<NET-CHANGE-IN-ASSETS> (18254)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2468
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 685<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1125<F1>
<AVERAGE-NET-ASSETS> 136852<F1>
<PER-SHARE-NAV-BEGIN> 8.83<F1>
<PER-SHARE-NII> .40<F1>
<PER-SHARE-GAIN-APPREC> (.63)<F1>
<PER-SHARE-DIVIDEND> (.40)<F1>
<PER-SHARE-DISTRIBUTIONS> (.16)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.04<F1>
<EXPENSE-RATIO> .82<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>033
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MICHIGAN CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 126495
<INVESTMENTS-AT-VALUE> 126531
<RECEIVABLES> 2415
<ASSETS-OTHER> 129
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 129077
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1329
<TOTAL-LIABILITIES> 1329
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 127231
<SHARES-COMMON-STOCK> 14<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 482
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 36
<NET-ASSETS> 114<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 1<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 1<F1>
<REALIZED-GAINS-CURRENT> 617
<APPREC-INCREASE-CURRENT> (10841)
<NET-CHANGE-FROM-OPS> (3666)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 14<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (18254)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2468
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 49<F1>
<PER-SHARE-NAV-BEGIN> 8.43<F1>
<PER-SHARE-NII> .11<F1>
<PER-SHARE-GAIN-APPREC> (.40)<F1>
<PER-SHARE-DIVIDEND> (.11)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.03<F1>
<EXPENSE-RATIO> 1.73<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>034
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MICHIGAN CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 126495
<INVESTMENTS-AT-VALUE> 126531
<RECEIVABLES> 2415
<ASSETS-OTHER> 129
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 129077
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1329
<TOTAL-LIABILITIES> 1329
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 127231
<SHARES-COMMON-STOCK> 258<F1>
<SHARES-COMMON-PRIOR> 209<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 482
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 36
<NET-ASSETS> 2074<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 132<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (41)<F1>
<NET-INVESTMENT-INCOME> 91<F1>
<REALIZED-GAINS-CURRENT> 617
<APPREC-INCREASE-CURRENT> (10841)
<NET-CHANGE-FROM-OPS> (3666)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (91)<F1>
<DISTRIBUTIONS-OF-GAINS> (38)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 125<F1>
<NUMBER-OF-SHARES-REDEEMED> (87)<F1>
<SHARES-REINVESTED> 11<F1>
<NET-CHANGE-IN-ASSETS> (18254)
<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> 12<F1>
<AVERAGE-NET-ASSETS> 2383<F1>
<PER-SHARE-NAV-BEGIN> 8.82<F1>
<PER-SHARE-NII> .32<F1>
<PER-SHARE-GAIN-APPREC> (.63)<F1>
<PER-SHARE-DIVIDEND> (.32)<F1>
<PER-SHARE-DISTRIBUTIONS> (.16)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.03<F1>
<EXPENSE-RATIO> 1.72<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>041
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MINNESOTA SERIES CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 110101
<INVESTMENTS-AT-VALUE> 109371
<RECEIVABLES> 1934
<ASSETS-OTHER> 88
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 111394
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 373
<TOTAL-LIABILITIES> 373
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 111156
<SHARES-COMMON-STOCK> 14826<F1>
<SHARES-COMMON-PRIOR> 15217<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 595
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (730)
<NET-ASSETS> 109165<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6512<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (986)<F1>
<NET-INVESTMENT-INCOME> 5526<F1>
<REALIZED-GAINS-CURRENT> 607
<APPREC-INCREASE-CURRENT> (8516)
<NET-CHANGE-FROM-OPS> (2304)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (5526)<F1>
<DISTRIBUTIONS-OF-GAINS> (1489)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 527<F1>
<NUMBER-OF-SHARES-REDEEMED> (1547)<F1>
<SHARES-REINVESTED> 629<F1>
<NET-CHANGE-IN-ASSETS> (12455)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1504
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 587<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 986<F1>
<AVERAGE-NET-ASSETS> 117287<F1>
<PER-SHARE-NAV-BEGIN> 7.98<F1>
<PER-SHARE-NII> .36<F1>
<PER-SHARE-GAIN-APPREC> (.52)<F1>
<PER-SHARE-DIVIDEND> (.36)<F1>
<PER-SHARE-DISTRIBUTIONS> (.10)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.36<F1>
<EXPENSE-RATIO> .84<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>043
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MINNESOTA SERIES CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 110101
<INVESTMENTS-AT-VALUE> 109371
<RECEIVABLES> 1934
<ASSETS-OTHER> 88
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 111394
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 373
<TOTAL-LIABILITIES> 373
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 111156
<SHARES-COMMON-STOCK> 0<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 595
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (730)
<NET-ASSETS> 0<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 0<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 0<F1>
<REALIZED-GAINS-CURRENT> 607
<APPREC-INCREASE-CURRENT> (8516)
<NET-CHANGE-FROM-OPS> (2304)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (12455)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1504
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 0<F1>
<PER-SHARE-NAV-BEGIN> 7.72<F1>
<PER-SHARE-NII> .10<F1>
<PER-SHARE-GAIN-APPREC> (.36)<F1>
<PER-SHARE-DIVIDEND> (.10)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.36<F1>
<EXPENSE-RATIO> 1.74<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>044
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MINNESOTA SERIES CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 110101
<INVESTMENTS-AT-VALUE> 109371
<RECEIVABLES> 1934
<ASSETS-OTHER> 88
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 111394
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 373
<TOTAL-LIABILITIES> 373
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 111156
<SHARES-COMMON-STOCK> 252<F1>
<SHARES-COMMON-PRIOR> 263<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 595
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (730)
<NET-ASSETS> 1856<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 115<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (36)<F1>
<NET-INVESTMENT-INCOME> 79<F1>
<REALIZED-GAINS-CURRENT> 607
<APPREC-INCREASE-CURRENT> (8516)
<NET-CHANGE-FROM-OPS> (2304)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (79)<F1>
<DISTRIBUTIONS-OF-GAINS> (27)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 63<F1>
<NUMBER-OF-SHARES-REDEEMED> (83)<F1>
<SHARES-REINVESTED> 9<F1>
<NET-CHANGE-IN-ASSETS> (12455)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1504
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 10<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 36<F1>
<AVERAGE-NET-ASSETS> 2060<F1>
<PER-SHARE-NAV-BEGIN> 7.98<F1>
<PER-SHARE-NII> .30<F1>
<PER-SHARE-GAIN-APPREC> (.52)<F1>
<PER-SHARE-DIVIDEND> (.30)<F1>
<PER-SHARE-DISTRIBUTIONS> (.10)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.36<F1>
<EXPENSE-RATIO> 1.74<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>101
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MISSOURI CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 43757
<INVESTMENTS-AT-VALUE> 43340
<RECEIVABLES> 879
<ASSETS-OTHER> 146
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 44450
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 291
<TOTAL-LIABILITIES> 291
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 43437
<SHARES-COMMON-STOCK> 5960<F1>
<SHARES-COMMON-PRIOR> 6223<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 42
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (417)
<NET-ASSETS> 43437<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2572<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (419)<F1>
<NET-INVESTMENT-INCOME> 2153<F1>
<REALIZED-GAINS-CURRENT> 50
<APPREC-INCREASE-CURRENT> (3922)
<NET-CHANGE-FROM-OPS> (1700)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2153)<F1>
<DISTRIBUTIONS-OF-GAINS> (737)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 207<F1>
<NUMBER-OF-SHARES-REDEEMED> (674)<F1>
<SHARES-REINVESTED> 204<F1>
<NET-CHANGE-IN-ASSETS> (6292)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 736
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 239<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 419<F1>
<AVERAGE-NET-ASSETS> 47833<F1>
<PER-SHARE-NAV-BEGIN> 8.03<F1>
<PER-SHARE-NII> .35<F1>
<PER-SHARE-GAIN-APPREC> (.62)<F1>
<PER-SHARE-DIVIDEND> (.35)<F1>
<PER-SHARE-DISTRIBUTIONS> (.12)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.29<F1>
<EXPENSE-RATIO> .87<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>103
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MISSOURI CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 43757
<INVESTMENTS-AT-VALUE> 43340
<RECEIVABLES> 879
<ASSETS-OTHER> 146
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 44366
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 291
<TOTAL-LIABILITIES> 291
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 44450
<SHARES-COMMON-STOCK> 3<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 42
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (417)
<NET-ASSETS> 21<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 0<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 0<F1>
<REALIZED-GAINS-CURRENT> 50
<APPREC-INCREASE-CURRENT> (3922)
<NET-CHANGE-FROM-OPS> (1700)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (6292)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 736
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 19<F1>
<PER-SHARE-NAV-BEGIN> 7.68<F1>
<PER-SHARE-NII> .10<F1>
<PER-SHARE-GAIN-APPREC> (.39)<F1>
<PER-SHARE-DIVIDEND> (.10)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.29<F1>
<EXPENSE-RATIO> 1.74<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>104
<NAME> SELIGMAN MUNICIPAL FUND SERIES-MISSOURI CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 43757
<INVESTMENTS-AT-VALUE> 43340
<RECEIVABLES> 879
<ASSETS-OTHER> 146
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 44366
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 291
<TOTAL-LIABILITIES> 291
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 44450
<SHARES-COMMON-STOCK> 85<F1>
<SHARES-COMMON-PRIOR> 52<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 42
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (417)
<NET-ASSETS> 617<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 29<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (10)<F1>
<NET-INVESTMENT-INCOME> 19<F1>
<REALIZED-GAINS-CURRENT> 50
<APPREC-INCREASE-CURRENT> (3922)
<NET-CHANGE-FROM-OPS> (1700)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (19)<F1>
<DISTRIBUTIONS-OF-GAINS> (7)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 47<F1>
<NUMBER-OF-SHARES-REDEEMED> (17)<F1>
<SHARES-REINVESTED> 3<F1>
<NET-CHANGE-IN-ASSETS> (6292)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 736
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 10<F1>
<AVERAGE-NET-ASSETS> 545<F1>
<PER-SHARE-NAV-BEGIN> 8.03<F1>
<PER-SHARE-NII> .28<F1>
<PER-SHARE-GAIN-APPREC> (.62)<F1>
<PER-SHARE-DIVIDEND> (.28)<F1>
<PER-SHARE-DISTRIBUTIONS> (.12)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.29<F1>
<EXPENSE-RATIO> 1.77<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>051
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NEW YORK CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 78911
<INVESTMENTS-AT-VALUE> 78681
<RECEIVABLES> 1388
<ASSETS-OTHER> 131
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 80201
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 335
<TOTAL-LIABILITIES> 335
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 80134
<SHARES-COMMON-STOCK> 9984<F1>
<SHARES-COMMON-PRIOR> 9867<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (38)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (230)
<NET-ASSETS> 76833<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 4507<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (674)<F1>
<NET-INVESTMENT-INCOME> 3833<F1>
<REALIZED-GAINS-CURRENT> (30)
<APPREC-INCREASE-CURRENT> (7250)
<NET-CHANGE-FROM-OPS> (3338)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3833)<F1>
<DISTRIBUTIONS-OF-GAINS> (2032)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1393<F1>
<NUMBER-OF-SHARES-REDEEMED> (1757)<F1>
<SHARES-REINVESTED> 481<F1>
<NET-CHANGE-IN-ASSETS> (7138)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2079
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 414<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 674<F1>
<AVERAGE-NET-ASSETS> 82802<F1>
<PER-SHARE-NAV-BEGIN> 8.60<F1>
<PER-SHARE-NII> .38<F1>
<PER-SHARE-GAIN-APPREC> (.69)<F1>
<PER-SHARE-DIVIDEND> (.38)<F1>
<PER-SHARE-DISTRIBUTIONS> (.21)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.70<F1>
<EXPENSE-RATIO> .81<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>053
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NEW YORK CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 78911
<INVESTMENTS-AT-VALUE> 78681
<RECEIVABLES> 1388
<ASSETS-OTHER> 131
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 80201
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 335
<TOTAL-LIABILITIES> 335
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 80134
<SHARES-COMMON-STOCK> 25<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (38)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (230)
<NET-ASSETS> 189<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1)<F1>
<NET-INVESTMENT-INCOME> 2<F1>
<REALIZED-GAINS-CURRENT> (30)
<APPREC-INCREASE-CURRENT> (7250)
<NET-CHANGE-FROM-OPS> (3338)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 35<F1>
<NUMBER-OF-SHARES-REDEEMED> (10)<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (7138)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2079
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1<F1>
<AVERAGE-NET-ASSETS> 132<F1>
<PER-SHARE-NAV-BEGIN> 8.14<F1>
<PER-SHARE-NII> .11<F1>
<PER-SHARE-GAIN-APPREC> (.44)<F1>
<PER-SHARE-DIVIDEND> (.11)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.70<F1>
<EXPENSE-RATIO> 1.69<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>054
<NAME> SELIGMAN MUNICIPAL FUND SERIES-NEW YORK CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 78911
<INVESTMENTS-AT-VALUE> 78681
<RECEIVABLES> 1388
<ASSETS-OTHER> 131
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 80201
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 335
<TOTAL-LIABILITIES> 335
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 80134
<SHARES-COMMON-STOCK> 369<F1>
<SHARES-COMMON-PRIOR> 253<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (38)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (230)
<NET-ASSETS> 2844<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 156<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (49)<F1>
<NET-INVESTMENT-INCOME> 107<F1>
<REALIZED-GAINS-CURRENT> (30)
<APPREC-INCREASE-CURRENT> (7250)
<NET-CHANGE-FROM-OPS> (3338)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (107)<F1>
<DISTRIBUTIONS-OF-GAINS> (55)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 167<F1>
<NUMBER-OF-SHARES-REDEEMED> (66)<F1>
<SHARES-REINVESTED> 15<F1>
<NET-CHANGE-IN-ASSETS> (7138)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2079
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 49<F1>
<AVERAGE-NET-ASSETS> 2874<F1>
<PER-SHARE-NAV-BEGIN> 8.60<F1>
<PER-SHARE-NII> .30<F1>
<PER-SHARE-GAIN-APPREC> (.69)<F1>
<PER-SHARE-DIVIDEND> (.30)<F1>
<PER-SHARE-DISTRIBUTIONS> (.21)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.70<F1>
<EXPENSE-RATIO> 1.71<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>061
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OHIO CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 134231
<INVESTMENTS-AT-VALUE> 134238
<RECEIVABLES> 2477
<ASSETS-OTHER> 89
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 136806
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 427
<TOTAL-LIABILITIES> 427
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 136098
<SHARES-COMMON-STOCK> 17681<F1>
<SHARES-COMMON-PRIOR> 18304<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 274
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7
<NET-ASSETS> 135034<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 8191<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (1184)<F1>
<NET-INVESTMENT-INCOME> 7007<F1>
<REALIZED-GAINS-CURRENT> 298
<APPREC-INCREASE-CURRENT> (11188)
<NET-CHANGE-FROM-OPS> (3828)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (7007)<F1>
<DISTRIBUTIONS-OF-GAINS> (2413)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 496<F1>
<NUMBER-OF-SHARES-REDEEMED> (1873)<F1>
<SHARES-REINVESTED> 754<F1>
<NET-CHANGE-IN-ASSETS> (17851)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2407
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 734<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1184<F1>
<AVERAGE-NET-ASSETS> 146669<F1>
<PER-SHARE-NAV-BEGIN> 8.37<F1>
<PER-SHARE-NII> .38<F1>
<PER-SHARE-GAIN-APPREC> (.60)<F1>
<PER-SHARE-DIVIDEND> (.38)<F1>
<PER-SHARE-DISTRIBUTIONS> (.13)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.64<F1>
<EXPENSE-RATIO> .81<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>063
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OHIO CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 134231
<INVESTMENTS-AT-VALUE> 134238
<RECEIVABLES> 2477
<ASSETS-OTHER> 89
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 136806
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 427
<TOTAL-LIABILITIES> 427
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 136098
<SHARES-COMMON-STOCK> 2<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 274
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7
<NET-ASSETS> 18<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 0<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 0<F1>
<REALIZED-GAINS-CURRENT> 298
<APPREC-INCREASE-CURRENT> (11188)
<NET-CHANGE-FROM-OPS> (3828)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (17851)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2407
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 8<F1>
<PER-SHARE-NAV-BEGIN> 8.06<F1>
<PER-SHARE-NII> .11<F1>
<PER-SHARE-GAIN-APPREC> (.38)<F1>
<PER-SHARE-DIVIDEND> (.11)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.68<F1>
<EXPENSE-RATIO> 1.71<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>064
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OHIO CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 134231
<INVESTMENTS-AT-VALUE> 134238
<RECEIVABLES> 2477
<ASSETS-OTHER> 89
<OTHER-ITEMS-ASSETS> 2
<TOTAL-ASSETS> 136806
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 427
<TOTAL-LIABILITIES> 427
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 136098
<SHARES-COMMON-STOCK> 173<F1>
<SHARES-COMMON-PRIOR> 131<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 274
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 7
<NET-ASSETS> 1327<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 79<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (24)<F1>
<NET-INVESTMENT-INCOME> 55<F1>
<REALIZED-GAINS-CURRENT> 298
<APPREC-INCREASE-CURRENT> (11188)
<NET-CHANGE-FROM-OPS> (3828)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (55)<F1>
<DISTRIBUTIONS-OF-GAINS> (18)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 106<F1>
<NUMBER-OF-SHARES-REDEEMED> (71)<F1>
<SHARES-REINVESTED> 7<F1>
<NET-CHANGE-IN-ASSETS> (17851)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 2407
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 7<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 24<F1>
<AVERAGE-NET-ASSETS> 1413<F1>
<PER-SHARE-NAV-BEGIN> 8.41<F1>
<PER-SHARE-NII> .31<F1>
<PER-SHARE-GAIN-APPREC> (.60)<F1>
<PER-SHARE-DIVIDEND> (.31)<F1>
<PER-SHARE-DISTRIBUTIONS> (.13)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.68<F1>
<EXPENSE-RATIO> 1.71<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>111
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OREGON CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 55657
<INVESTMENTS-AT-VALUE> 55708
<RECEIVABLES> 1201
<ASSETS-OTHER> 71
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 56981
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 278
<TOTAL-LIABILITIES> 278
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 56274
<SHARES-COMMON-STOCK> 7280<F1>
<SHARES-COMMON-PRIOR> 7159<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 380
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 51
<NET-ASSETS> 54473<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3078<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (493)<F1>
<NET-INVESTMENT-INCOME> 2585<F1>
<REALIZED-GAINS-CURRENT> 384
<APPREC-INCREASE-CURRENT> (4304)
<NET-CHANGE-FROM-OPS> (1242)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2585)<F1>
<DISTRIBUTIONS-OF-GAINS> (359)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 810<F1>
<NUMBER-OF-SHARES-REDEEMED> (933)<F1>
<SHARES-REINVESTED> 244<F1>
<NET-CHANGE-IN-ASSETS> (3548)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 371
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 286<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 493<F1>
<AVERAGE-NET-ASSETS> 57278<F1>
<PER-SHARE-NAV-BEGIN> 8.05<F1>
<PER-SHARE-NII> .35<F1>
<PER-SHARE-GAIN-APPREC> (.52)<F1>
<PER-SHARE-DIVIDEND> (.35)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.48<F1>
<EXPENSE-RATIO> .86<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>113
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OREGON CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 55657
<INVESTMENTS-AT-VALUE> 55708
<RECEIVABLES> 1201
<ASSETS-OTHER> 71
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 56981
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 278
<TOTAL-LIABILITIES> 278
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 56274
<SHARES-COMMON-STOCK> 0<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 380
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 51
<NET-ASSETS> 0<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 0<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 0<F1>
<REALIZED-GAINS-CURRENT> 384
<APPREC-INCREASE-CURRENT> (4304)
<NET-CHANGE-FROM-OPS> (1242)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (3548)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 371
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 0<F1>
<PER-SHARE-NAV-BEGIN> 7.83<F1>
<PER-SHARE-NII> .10<F1>
<PER-SHARE-GAIN-APPREC> (.35)<F1>
<PER-SHARE-DIVIDEND> (.10)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.48<F1>
<EXPENSE-RATIO> 1.73<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>114
<NAME> SELIGMAN MUNICIPAL FUND SERIES-OREGON CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 55657
<INVESTMENTS-AT-VALUE> 55708
<RECEIVABLES> 1201
<ASSETS-OTHER> 71
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 56981
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 278
<TOTAL-LIABILITIES> 278
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 56274
<SHARES-COMMON-STOCK> 298<F1>
<SHARES-COMMON-PRIOR> 329<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 380
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 51
<NET-ASSETS> 2231<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 138<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (45)<F1>
<NET-INVESTMENT-INCOME> 93<F1>
<REALIZED-GAINS-CURRENT> 384
<APPREC-INCREASE-CURRENT> (4304)
<NET-CHANGE-FROM-OPS> (1242)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (93)<F1>
<DISTRIBUTIONS-OF-GAINS> (16)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 49<F1>
<NUMBER-OF-SHARES-REDEEMED> (90)<F1>
<SHARES-REINVESTED> 10<F1>
<NET-CHANGE-IN-ASSETS> (3548)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 371
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 13<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 45<F1>
<AVERAGE-NET-ASSETS> 2579<F1>
<PER-SHARE-NAV-BEGIN> 8.04<F1>
<PER-SHARE-NII> .28<F1>
<PER-SHARE-GAIN-APPREC> (.51)<F1>
<PER-SHARE-DIVIDEND> (.28)<F1>
<PER-SHARE-DISTRIBUTIONS> (.05)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.48<F1>
<EXPENSE-RATIO> 1.76<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>151
<NAME> SELIGMAN MUNICIPAL FUND SERIES-SOUTH CAROLINA CL A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 98532
<INVESTMENTS-AT-VALUE> 97386
<RECEIVABLES> 1847
<ASSETS-OTHER> 144
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 99378
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 313
<TOTAL-LIABILITIES> 313
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 99397
<SHARES-COMMON-STOCK> 12104<F1>
<SHARES-COMMON-PRIOR> 12682<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 814
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1146)
<NET-ASSETS> 92793<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5608<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (846)<F1>
<NET-INVESTMENT-INCOME> 4762<F1>
<REALIZED-GAINS-CURRENT> 969
<APPREC-INCREASE-CURRENT> (9667)
<NET-CHANGE-FROM-OPS> (3706)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4762)<F1>
<DISTRIBUTIONS-OF-GAINS> (835)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 535<F1>
<NUMBER-OF-SHARES-REDEEMED> (1527)<F1>
<SHARES-REINVESTED> 414<F1>
<NET-CHANGE-IN-ASSETS> (12858)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 724
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 512<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 846<F1>
<AVERAGE-NET-ASSETS> 102245<F1>
<PER-SHARE-NAV-BEGIN> 8.38<F1>
<PER-SHARE-NII> .38<F1>
<PER-SHARE-GAIN-APPREC> (.64)<F1>
<PER-SHARE-DIVIDEND> (.38)<F1>
<PER-SHARE-DISTRIBUTIONS> (.07)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.67<F1>
<EXPENSE-RATIO> .83<F1>
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>153
<NAME> SELIGMAN MUNICIPAL FUND SERIES-SOUTH CAROLINA CL C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 98532
<INVESTMENTS-AT-VALUE> 97386
<RECEIVABLES> 1847
<ASSETS-OTHER> 144
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 99378
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 313
<TOTAL-LIABILITIES> 313
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 99397
<SHARES-COMMON-STOCK> 44<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 814
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1146)
<NET-ASSETS> 335<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 5<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (2)<F1>
<NET-INVESTMENT-INCOME> 3<F1>
<REALIZED-GAINS-CURRENT> 969
<APPREC-INCREASE-CURRENT> (9667)
<NET-CHANGE-FROM-OPS> (3706)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (3)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 44<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (12858)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 724
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2<F1>
<AVERAGE-NET-ASSETS> 260<F1>
<PER-SHARE-NAV-BEGIN> 8.08<F1>
<PER-SHARE-NII> .11<F1>
<PER-SHARE-GAIN-APPREC> (.42)<F1>
<PER-SHARE-DIVIDEND> (.11)<F1>
<PER-SHARE-DISTRIBUTIONS> 0<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.66<F1>
<EXPENSE-RATIO> 1.72<F1>
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER>154
<NAME> SELIGMAN MUNICIPAL FUND SERIES-SOUTH CAROLINA CL D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 12-mos
<FISCAL-YEAR-END> SEP-30-1999
<PERIOD-END> SEP-30-1999
<INVESTMENTS-AT-COST> 98532
<INVESTMENTS-AT-VALUE> 97386
<RECEIVABLES> 1847
<ASSETS-OTHER> 144
<OTHER-ITEMS-ASSETS> 1
<TOTAL-ASSETS> 99378
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 313
<TOTAL-LIABILITIES> 313
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 99397
<SHARES-COMMON-STOCK> 775<F1>
<SHARES-COMMON-PRIOR> 668<F1>
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 814
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1146)
<NET-ASSETS> 5936<F1>
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 331<F1>
<OTHER-INCOME> 0
<EXPENSES-NET> (104)<F1>
<NET-INVESTMENT-INCOME> 227<F1>
<REALIZED-GAINS-CURRENT> 969
<APPREC-INCREASE-CURRENT> (9667)
<NET-CHANGE-FROM-OPS> (3706)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (227)<F1>
<DISTRIBUTIONS-OF-GAINS> (44)<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 207<F1>
<NUMBER-OF-SHARES-REDEEMED> (124)<F1>
<SHARES-REINVESTED> 24<F1>
<NET-CHANGE-IN-ASSETS> (12858)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 724
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 30<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 104<F1>
<AVERAGE-NET-ASSETS> 6053<F1>
<PER-SHARE-NAV-BEGIN> 8.38<F1>
<PER-SHARE-NII> .30<F1>
<PER-SHARE-GAIN-APPREC> (.65)<F1>
<PER-SHARE-DIVIDEND> (.30)<F1>
<PER-SHARE-DISTRIBUTIONS> (.07)<F1>
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.66<F1>
<EXPENSE-RATIO> 1.73<F1>
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
INDEPENDENT AUDITORS' REPORT
The Board of Directors
Seligman Municipal Fund Series, Inc.
In planning and performing our audit of the financial statements of Seligman
Municipal Fund Series, Inc. (the "Company") (including the National, Colorado,
Georgia, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New
York, Ohio, Oregon and South Carolina Series) for the year ended September 30,
1999 (on which we have issued our report dated November 5, 1999), we considered
its internal control, including control activities for safeguarding securities,
in order to determine our auditing procedures for the purpose of expressing our
opinion on the financial statements and to comply with the requirements of Form
N-SAR, and not to provide assurance on the Company's internal control.
The management of the Company is responsible for establishing and maintaining
internal control. In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and related costs of
controls. Generally, controls that are relevant to an audit pertain to the
entity's objective of preparing financial statements for external purposes that
are fairly presented in conformity with generally accepted accounting
principles. Those controls include the safeguarding of assets against
unauthorized acquisition, use, or disposition.
Because of inherent limitations in any internal control, misstatements due to
error or fraud may occur and not be detected. Also projections of any evaluation
of internal control to future periods are subject to the risk that the internal
control may be become inadequate because of changes in conditions or that the
degree of compliance with policies and procedures may deteriorate.
Our consideration of the Company's internal control would not necessarily
disclose all matters in the internal control that might be material weaknesses
under standards established by the American Institute of Certified Public
Accountants. A material weakness is a condition in which the design or operation
of one or more of the internal control components does not reduce to a
relatively low level the risk that misstatement caused by error or fraud in
amounts that would be material in relation to the financial statements being
audited may occur and not be detected within a timely period by employees in the
normal course of performing their assigned functions. However, we noted no
matters involving the Company's internal control and its operation, including
controls for safeguarding securities, that we consider to be material weaknesses
as defined above as of September 30, 1999.
This report is intended solely for the information and use of management, and
the Board of Directors of Seligman Municipal Fund Series, Inc., and the
Securities and Exchange Commission and is not intended to be and should not be
used by anyone other than these specified parties.
/s/ DELOITTE & TOUCHE LLP
- -------------------------
DELOITTE & TOUCHE LLP
New York, New York
November 5, 1999
