OPPENHEIMER MUNICIPAL FUND
NSAR-A, 1998-05-29
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<PAGE>      PAGE  1
000 A000000 03/31/98
000 C000000 799102
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 OPPENHEIMER MUNICIPAL FUND
001 B000000 811-4803
001 C000000 3037683200
002 A000000 6803 SOUTH TUCSON WAY
002 B000000 ENGLEWOOD
002 C000000 CO
002 D010000 80112
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  2
007 C010100  1
007 C020100 OPPENHEIMER INTERMEDIATE MUNICIPAL FUND
007 C030100 N
007 C010200  2
007 C020200 OPPENHEIMER INSURED MUNICIPAL FUND
007 C030200 N
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
008 A00AA01 OPPENHEIMERFUNDS, INC.
008 B00AA01 A
008 C00AA01 801-8253
008 D01AA01 NEW YORK
008 D02AA01 NY
008 D03AA01 10048
008 D04AA01 0203
011 A00AA01 OPPENHEIMERFUNDS DISTRIBUTOR, INC.
011 B00AA01 8-22992
011 C01AA01 NEW YORK
011 C02AA01 NY
011 C03AA01 10048
011 C04AA01 0203
012 A00AA01 OPPENHEIMERFUNDS SERVICES
012 B00AA01 84-1562
<PAGE>      PAGE  2
012 C01AA01 ENGLEWOOD
012 C02AA01 CO
012 C03AA01 80112
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 DENVER
013 B02AA01 CO
013 B03AA01 80202
015 A00AA01 CITIBANK, N.A.
015 B00AA01 C
015 C01AA01 NEW YORK
015 C02AA01 NY
015 C03AA01 10154
015 E01AA01 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   49
019 C00AA00 OPPENHEIMR
020 A000001 FIRST BOSTON CORP. (THE)
020 B000001 13-5659485
020 C000001     31
020 A000002 SMITH BARNEY, HARRIS UPHAM & CO., INC.
020 B000002 13-3371860
020 C000002     26
020 A000003 R.J. OBRIEN SECURITIES
020 B000003 36-3233364
020 C000003      3
020 A000004 MERRILL LYNCH, PIERCE, FENNER, & SMITH, INC.
020 B000004 13-5674085
020 C000004      1
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020 C000006      0
020 C000007      0
020 C000008      0
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020 C000010      0
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022 B000001 13-3371860
022 C000001     29146
022 D000001     14263
022 A000002 CITIBANK, N.A.
022 B000002 13-5266470
022 C000002      9100
022 D000002     10104
022 A000003 BEAR STEAMS SECURITIES CORP.
022 B000003 13-3299429
022 C000003     11795
022 D000003      4200
022 A000004 MORGAN GUARANTY TRUST CO.
022 B000004 13-5123346
022 C000004      7100
<PAGE>      PAGE  3
022 D000004      8000
022 A000005 MORGAN STANLEY & CO., INC.
022 B000005 13-2655998
022 C000005      7496
022 D000005      5002
022 A000006 LEHMAN BROTHERS, INC.
022 B000006 13-2518466
022 C000006      5703
022 D000006      5110
022 A000007 PAINEWEBBER, INC.
022 B000007 13-2638166
022 C000007      1747
022 D000007      5883
022 A000008 GOLDMAN, SACHS & CO.
022 B000008 13-5108880
022 C000008      2968
022 D000008      2000
022 A000009 MERRILL LYNCH, PIERCE, FENNER, & SMITH, INC.
022 B000009 13-5674085
022 C000009      1789
022 D000009      2927
022 A000010 MORGAN KEEGAN & CO., INC.
022 B000010 64-0474907
022 C000010      3202
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023 C000000      97620
023 D000000      83515
077 A000000 Y
077 B000000 N
077 C000000 N
077 D000000 N
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077 F000000 N
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077 H000000 N
077 I000000 N
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077 L000000 N
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<PAGE>      PAGE  4
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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048 I010200        0
048 I020200 0.000
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048 K010200   500000
048 K020200 0.350
055 A000200 Y
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057  000200 N
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062 B000200   0.0
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062 D000200   0.0
062 E000200   0.0
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062 I000200   1.5
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062 P000200   0.0
<PAGE>      PAGE  10
062 Q000200   0.0
062 R000200   0.0
063 A000200   0
063 B000200 19.2
064 A000200 Y
064 B000200 N
070 A010200 Y
070 A020200 N
070 B010200 N
070 B020200 N
070 C010200 Y
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 Y
070 E020200 Y
070 F010200 N
070 F020200 N
070 G010200 Y
070 G020200 Y
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 N
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 Y
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 Y
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
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071 B000200     29063
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<PAGE>      PAGE  11
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074 C000200     1800
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074 O000200     7889
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<PAGE>      PAGE  12
074 R030200        0
074 R040200      529
074 S000200        0
074 T000200   125652
074 U010200     5455
074 U020200     1357
074 V010200    17.91
074 V020200    17.92
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074 X000200     4298
074 Y000200     5445
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075 B000200   119707
076  000200     0.00
SIGNATURE   GEORGE C. BOWEN                              
TITLE       TREASURER           
 

WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6                        
<CIK>                799102
<NAME>               Oppenheimer Intermediate Municipal Fund- A
<SERIES>                                                                 
   <NUMBER>          1
   <NAME>            Oppenheimer Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            MAR-31-1998
<INVESTMENTS-AT-COST>                                                                 116,999,659
<INVESTMENTS-AT-VALUE>                                                                123,701,271
<RECEIVABLES>                                                                           4,248,583
<ASSETS-OTHER>                                                                             21,314
<OTHER-ITEMS-ASSETS>                                                                      105,226
<TOTAL-ASSETS>                                                                        128,076,394
<PAYABLE-FOR-SECURITIES>                                                                2,008,940
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 902,264
<TOTAL-LIABILITIES>                                                                     2,911,204
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              118,111,860
<SHARES-COMMON-STOCK>                                                                   6,340,533
<SHARES-COMMON-PRIOR>                                                                   5,745,793
<ACCUMULATED-NII-CURRENT>                                                                 748,411
<OVERDISTRIBUTION-NII>                                                                          0
<ACCUMULATED-NET-GAINS>                                                                  (402,943)
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                6,707,862
<NET-ASSETS>                                                                           97,466,813
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       3,310,584
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                            669,222
<NET-INVESTMENT-INCOME>                                                                 2,641,362
<REALIZED-GAINS-CURRENT>                                                                  339,037
<APPREC-INCREASE-CURRENT>                                                               1,175,635
<NET-CHANGE-FROM-OPS>                                                                   4,156,034
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                               2,198,888
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                 1,200,192
<NUMBER-OF-SHARES-REDEEMED>                                                               704,889
<SHARES-REINVESTED>                                                                        99,437
<NET-CHANGE-IN-ASSETS>                                                                 16,424,616
<ACCUMULATED-NII-PRIOR>                                                                   616,172
<ACCUMULATED-GAINS-PRIOR>                                                                (741,980)
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     290,775
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                           669,222
<AVERAGE-NET-ASSETS>                                                                   93,663,426
<PER-SHARE-NAV-BEGIN>                                                                          15.16
<PER-SHARE-NII>                                                                                 0.34
<PER-SHARE-GAIN-APPREC>                                                                         0.23
<PER-SHARE-DIVIDEND>                                                                            0.36
<PER-SHARE-DISTRIBUTIONS>                                                                       0.00
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            15.37
<EXPENSE-RATIO>                                                                                 0.97
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6                        
<CIK>                799102
<NAME>               Oppenheimer Intermediate Municipal Fund- B
<SERIES>                                                                 
   <NUMBER>          1
   <NAME>            Oppenheimer Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            MAR-31-1998
<INVESTMENTS-AT-COST>                                                                 116,999,659
<INVESTMENTS-AT-VALUE>                                                                123,701,271
<RECEIVABLES>                                                                           4,248,583
<ASSETS-OTHER>                                                                             21,314
<OTHER-ITEMS-ASSETS>                                                                      105,226
<TOTAL-ASSETS>                                                                        128,076,394
<PAYABLE-FOR-SECURITIES>                                                                2,008,940
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 902,264
<TOTAL-LIABILITIES>                                                                     2,911,204
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              118,111,860
<SHARES-COMMON-STOCK>                                                                     699,038
<SHARES-COMMON-PRIOR>                                                                     507,362
<ACCUMULATED-NII-CURRENT>                                                                 748,411
<OVERDISTRIBUTION-NII>                                                                          0
<ACCUMULATED-NET-GAINS>                                                                  (402,943)
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                6,707,862
<NET-ASSETS>                                                                           10,742,700
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       3,310,584
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                            669,222
<NET-INVESTMENT-INCOME>                                                                 2,641,362
<REALIZED-GAINS-CURRENT>                                                                  339,037
<APPREC-INCREASE-CURRENT>                                                               1,175,635
<NET-CHANGE-FROM-OPS>                                                                   4,156,034
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                 185,508
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   217,055
<NUMBER-OF-SHARES-REDEEMED>                                                                33,431
<SHARES-REINVESTED>                                                                         8,052
<NET-CHANGE-IN-ASSETS>                                                                 16,424,616
<ACCUMULATED-NII-PRIOR>                                                                   616,172
<ACCUMULATED-GAINS-PRIOR>                                                                (741,980)
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     290,775
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                           669,222
<AVERAGE-NET-ASSETS>                                                                    9,486,833
<PER-SHARE-NAV-BEGIN>                                                                          15.16
<PER-SHARE-NII>                                                                                 0.31
<PER-SHARE-GAIN-APPREC>                                                                         0.21
<PER-SHARE-DIVIDEND>                                                                            0.31
<PER-SHARE-DISTRIBUTIONS>                                                                       0.00
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            15.37
<EXPENSE-RATIO>                                                                                 1.73
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6                        
<CIK>                799102
<NAME>               Oppenheimer Intermediate Municipal Fund-C
<SERIES>                                                                 
   <NUMBER>          1
   <NAME>            Oppenheimer Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            MAR-30-1998
<INVESTMENTS-AT-COST>                                                                 116,999,659
<INVESTMENTS-AT-VALUE>                                                                123,701,271
<RECEIVABLES>                                                                           4,248,583
<ASSETS-OTHER>                                                                             21,314
<OTHER-ITEMS-ASSETS>                                                                      105,226
<TOTAL-ASSETS>                                                                        128,076,394
<PAYABLE-FOR-SECURITIES>                                                                2,008,940
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 902,264
<TOTAL-LIABILITIES>                                                                     2,911,204
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              118,111,860
<SHARES-COMMON-STOCK>                                                                   1,104,991
<SHARES-COMMON-PRIOR>                                                                     921,116
<ACCUMULATED-NII-CURRENT>                                                                 748,411
<OVERDISTRIBUTION-NII>                                                                          0
<ACCUMULATED-NET-GAINS>                                                                  (402,943)
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                6,707,862
<NET-ASSETS>                                                                           16,955,677
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       3,310,584
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                            669,222
<NET-INVESTMENT-INCOME>                                                                 2,641,362
<REALIZED-GAINS-CURRENT>                                                                  339,037
<APPREC-INCREASE-CURRENT>                                                               1,175,635
<NET-CHANGE-FROM-OPS>                                                                   4,156,034
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                 303,010
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   313,636
<NUMBER-OF-SHARES-REDEEMED>                                                               145,216
<SHARES-REINVESTED>                                                                        15,455
<NET-CHANGE-IN-ASSETS>                                                                 16,424,616
<ACCUMULATED-NII-PRIOR>                                                                   616,172
<ACCUMULATED-GAINS-PRIOR>                                                                (741,980)
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     290,775
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                           669,222
<AVERAGE-NET-ASSETS>                                                                   15,416,796
<PER-SHARE-NAV-BEGIN>                                                                          15.13
<PER-SHARE-NII>                                                                                 0.30
<PER-SHARE-GAIN-APPREC>                                                                         0.22
<PER-SHARE-DIVIDEND>                                                                            0.31
<PER-SHARE-DISTRIBUTIONS>                                                                       0.00
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            15.34
<EXPENSE-RATIO>                                                                                 1.73
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6                        
<CIK>                799102
<NAME>               Oppenheimer Insured Municipal Fund - A
<SERIES>                                                                 
   <NUMBER>          2
   <NAME>            Oppenheimer Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            MAR-31-1998
<INVESTMENTS-AT-COST>                                                                 121,882,395
<INVESTMENTS-AT-VALUE>                                                                129,626,510
<RECEIVABLES>                                                                           4,065,611
<ASSETS-OTHER>                                                                             20,080
<OTHER-ITEMS-ASSETS>                                                                      357,970
<TOTAL-ASSETS>                                                                        134,070,171
<PAYABLE-FOR-SECURITIES>                                                                7,888,781
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 529,498
<TOTAL-LIABILITIES>                                                                     8,418,279
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              117,162,752
<SHARES-COMMON-STOCK>                                                                   5,454,783
<SHARES-COMMON-PRIOR>                                                                   5,138,201
<ACCUMULATED-NII-CURRENT>                                                                 157,131
<OVERDISTRIBUTION-NII>                                                                          0
<ACCUMULATED-NET-GAINS>                                                                   558,207
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                7,773,802
<NET-ASSETS>                                                                           97,715,504
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       3,189,643
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                            623,105
<NET-INVESTMENT-INCOME>                                                                 2,566,538
<REALIZED-GAINS-CURRENT>                                                                  602,810
<APPREC-INCREASE-CURRENT>                                                               1,618,378
<NET-CHANGE-FROM-OPS>                                                                   4,787,726
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                               2,241,710
<DISTRIBUTIONS-OF-GAINS>                                                                  646,115
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   508,759
<NUMBER-OF-SHARES-REDEEMED>                                                               311,610
<SHARES-REINVESTED>                                                                       119,433
<NET-CHANGE-IN-ASSETS>                                                                 12,072,683
<ACCUMULATED-NII-PRIOR>                                                                   310,788
<ACCUMULATED-GAINS-PRIOR>                                                                 770,265
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     263,557
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                           623,105
<AVERAGE-NET-ASSETS>                                                                   94,595,529
<PER-SHARE-NAV-BEGIN>                                                                          17.72
<PER-SHARE-NII>                                                                                 0.40
<PER-SHARE-GAIN-APPREC>                                                                         0.34
<PER-SHARE-DIVIDEND>                                                                            0.43
<PER-SHARE-DISTRIBUTIONS>                                                                       0.12
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            17.91
<EXPENSE-RATIO>                                                                                 0.89
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6                        
<CIK>                799102
<NAME>               Oppenheimer Insured Municipal Fund - B
<SERIES>                                                                 
   <NUMBER>          2
   <NAME>            Oppenheimer Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            MAR-31-1998
<INVESTMENTS-AT-COST>                                                                 121,882,395
<INVESTMENTS-AT-VALUE>                                                                129,626,510
<RECEIVABLES>                                                                           4,065,611
<ASSETS-OTHER>                                                                             20,080
<OTHER-ITEMS-ASSETS>                                                                      357,970
<TOTAL-ASSETS>                                                                        134,070,171
<PAYABLE-FOR-SECURITIES>                                                                7,888,781
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 529,498
<TOTAL-LIABILITIES>                                                                     8,418,279
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              117,162,752
<SHARES-COMMON-STOCK>                                                                   1,357,430
<SHARES-COMMON-PRIOR>                                                                   1,126,768
<ACCUMULATED-NII-CURRENT>                                                                 157,131
<OVERDISTRIBUTION-NII>                                                                          0
<ACCUMULATED-NET-GAINS>                                                                   558,207
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                7,773,802
<NET-ASSETS>                                                                           24,323,686
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       3,189,643
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                            623,105
<NET-INVESTMENT-INCOME>                                                                 2,566,538
<REALIZED-GAINS-CURRENT>                                                                  602,810
<APPREC-INCREASE-CURRENT>                                                               1,618,378
<NET-CHANGE-FROM-OPS>                                                                   4,787,726
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                 433,732
<DISTRIBUTIONS-OF-GAINS>                                                                  149,337
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   295,797
<NUMBER-OF-SHARES-REDEEMED>                                                                87,227
<SHARES-REINVESTED>                                                                        22,092
<NET-CHANGE-IN-ASSETS>                                                                 12,072,683
<ACCUMULATED-NII-PRIOR>                                                                   310,788
<ACCUMULATED-GAINS-PRIOR>                                                                 770,265
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     263,557
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                           623,105
<AVERAGE-NET-ASSETS>                                                                   22,028,181
<PER-SHARE-NAV-BEGIN>                                                                          17.73
<PER-SHARE-NII>                                                                                 0.32
<PER-SHARE-GAIN-APPREC>                                                                         0.35
<PER-SHARE-DIVIDEND>                                                                            0.36
<PER-SHARE-DISTRIBUTIONS>                                                                       0.12
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            17.92
<EXPENSE-RATIO>                                                                                 1.64
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6                        
<CIK>                799102
<NAME>               Oppenheimer Insured Municipal Fund - C
<SERIES>                                                                 
   <NUMBER>          2
   <NAME>            Oppenheimer Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            MAR-31-1998
<INVESTMENTS-AT-COST>                                                                 121,882,395
<INVESTMENTS-AT-VALUE>                                                                129,626,510
<RECEIVABLES>                                                                           4,065,611
<ASSETS-OTHER>                                                                             20,080
<OTHER-ITEMS-ASSETS>                                                                      357,970
<TOTAL-ASSETS>                                                                        134,070,171
<PAYABLE-FOR-SECURITIES>                                                                7,888,781
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 529,498
<TOTAL-LIABILITIES>                                                                     8,418,279
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              117,162,752
<SHARES-COMMON-STOCK>                                                                     201,702
<SHARES-COMMON-PRIOR>                                                                     144,171
<ACCUMULATED-NII-CURRENT>                                                                 157,131
<OVERDISTRIBUTION-NII>                                                                          0
<ACCUMULATED-NET-GAINS>                                                                   558,207
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                7,773,802
<NET-ASSETS>                                                                            3,612,702
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       3,189,643
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                            623,105
<NET-INVESTMENT-INCOME>                                                                 2,566,538
<REALIZED-GAINS-CURRENT>                                                                  602,810
<APPREC-INCREASE-CURRENT>                                                               1,618,378
<NET-CHANGE-FROM-OPS>                                                                   4,787,726
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                  60,154
<DISTRIBUTIONS-OF-GAINS>                                                                   19,416
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                    64,395
<NUMBER-OF-SHARES-REDEEMED>                                                                10,440
<SHARES-REINVESTED>                                                                         3,576
<NET-CHANGE-IN-ASSETS>                                                                 12,072,683
<ACCUMULATED-NII-PRIOR>                                                                   310,788
<ACCUMULATED-GAINS-PRIOR>                                                                 770,265
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     263,557
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                           623,105
<AVERAGE-NET-ASSETS>                                                                    3,082,817
<PER-SHARE-NAV-BEGIN>                                                                          17.72
<PER-SHARE-NII>                                                                                 0.30
<PER-SHARE-GAIN-APPREC>                                                                         0.37
<PER-SHARE-DIVIDEND>                                                                            0.36
<PER-SHARE-DISTRIBUTIONS>                                                                       0.12
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            17.91
<EXPENSE-RATIO>                                                                                 1.64
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00
        

</TABLE>

     As of November 4, 1997,  in order to conform  book and tax bases,  the Fund
     began   amortization   of  premiums  on  securities   for  book   purposes.
     Accordingly,  during the six months ended March 31, 1998, amounts have been
     reclassified to reflect an increase in undistributed  net investment income
     of $178,283,  an increase in  unrealized  appreciation  on  investments  of
     $719,029 and a decrease in paid-in capital of $897,312.  For bonds acquired
     after April 30, 1993, on disposition or maturity,  taxable  ordinary income
     is recognized  to the extent of the lesser of gain or market  discount that
     would have accrued over the holding  period.  Realized  gains and losses on
     investments and unrealized  appreciation and depreciation are determined on
     an identified  cost basis,  which is the same basis used for federal income
     tax purposes.


     As of November 4, 1997,  in order to conform  book and tax bases,  the Fund
     began   amortization   of  premiums  on  securities   for  book   purposes.
     Accordingly,  during the six months ended March 31, 1998, amounts have been
     reclassified to reflect a decrease in undistributed  net investment  income
     of $15,401,  an increase  in  unrealized  appreciation  on  investments  of
     $581,763 and an increase in paid-in capital of $597,164. For bonds acquired
     after April 30, 1993, on disposition or maturity,  taxable  ordinary income
     is recognized  to the extent of the lesser of gain or market  discount that
     would have accrued over the holding  period.  Realized  gains and losses on
     investments and unrealized  appreciation and depreciation are determined on
     an identified  cost basis,  which is the same basis used for federal income
     tax purposes.



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