OPPENHEIMER MUNICIPAL FUND
NSAR-B, 1998-11-24
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<PAGE>      PAGE  1
000 B000000 09/30/98
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 A
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
012 C04AA01 3924
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   46
019 C00AA00 OPPENHEIMR
020 A000001 SMITH BARNEY
020 B000001 13-3371860
020 C000001     49
020 A000002 FIRST BOSTON CORP.
020 B000002 13-5659485
020 C000002     32
020 A000003 R.J. OBRIEN SECURITIES
020 B000003 36-3233364
020 C000003     30
020 A000004 MERRILL LYNCH, PIERCE, FENNER, & SMITH, INC.
020 B000004 13-5674085
020 C000004     14
020 A000005 PAINEWEBBER, INC.
020 B000005 13-2638166
020 C000005      4
020 A000006 PRUDENTIAL SECURITIES, INC.
020 B000006 22-2347336
020 C000006      1
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000      130
022 A000001 SMITH BARNEY, HARRIS UPHAM & CO., INC.
022 B000001 13-3371860
022 C000001     66242
022 D000001     28755
022 A000002 MERRILL LYNCH, PIERCE, FENNER, & SMITH, INC.
022 B000002 13-5674085
022 C000002     14882
022 D000002     29444
022 A000003 MORGAN GUARANTY TRUST CO.
022 B000003 13-5123346
<PAGE>      PAGE  3
022 C000003     19900
022 D000003     18800
022 A000004 BEAR STEARNS & CO., INC.
022 B000004 13-3299429
022 C000004     19491
022 D000004      8177
022 A000005 CITIBANK, N.A.
022 B000005 13-5266470
022 C000005     12700
022 D000005     12604
022 A000006 GOLDMAN, SACHS & CO.
022 B000006 13-5108880
022 C000006     12348
022 D000006      7925
022 A000007 LEHMAN BROTHERS, INC.
022 B000007 13-2518466
022 C000007     10976
022 D000007      9012
022 A000008 MORGAN STANLEY & CO., INC.
022 B000008 13-2655998
022 C000008      9851
022 D000008      5002
022 A000009 MORGAN (J.P.) SECURITIES, INC.
022 B000009 13-3224016
022 C000009      6747
022 D000009      3669
022 A000010 PRUDENTIAL SECURITIES, INC.
022 B000010 22-2347336
022 C000010      3773
022 D000010      4517
023 C000000     262919
023 D000000     184506
024  00AA00 N
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025 D00AA03       0
025 D00AA04       0
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025 D00AA07       0
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026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 Y
<PAGE>      PAGE  4
037  00AA00 N
038  00AA00      0
039  00AA00 N
040  00AA00 Y
041  00AA00 Y
049  00AA00 N
050  00AA00 N
051  00AA00 N
052  00AA00 N
053 A00AA00 N
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 Y
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 Y
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 Y
058 A00AA00 N
059  00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061  00AA00       25
066 A00AA00 N
067  00AA00 N
068 A00AA00 N
068 B00AA00 N
069  00AA00 N
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077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 Y
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
<PAGE>      PAGE  5
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078  000000 N
080 A00AA00 ICI MUTUAL INSURANCE CO.
080 C00AA00    78000
081 A00AA00 Y
081 B00AA00  93
082 A00AA00 N
082 B00AA00        0
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
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085 B00AA00 N
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028 A020100       333
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028 B020100       341
028 B030100         0
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028 C010100      2287
028 C020100       345
028 C030100         0
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028 D010100      1955
028 D020100       349
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028 E010100      5676
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028 E030100         0
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028 F010100      3154
028 F020100       337
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028 G010100     19393
028 G020100      2056
028 G030100         0
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028 H000100      7527
029  000100 Y
030 A000100    304
030 B000100  3.50
030 C000100  0.00
031 A000100     55
031 B000100      0
<PAGE>      PAGE  6
032  000100    249
033  000100      0
034  000100 Y
035  000100     24
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042 B000100   0
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042 E000100   0
042 F000100   0
042 G000100   0
042 H000100   0
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046  000100 N
047  000100 Y
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048 C010100   250000
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048 E010100        0
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048 F010100        0
048 F020100 0.000
048 G010100        0
048 G020100 0.000
048 H010100        0
048 H020100 0.000
048 I010100        0
048 I020100 0.000
048 J010100        0
048 J020100 0.000
048 K010100   500000
048 K020100 0.400
055 A000100 N
055 B000100 N
056  000100 N
057  000100 N
062 A000100 Y
062 B000100   0.0
062 C000100   0.0
062 D000100   0.0
062 E000100   0.8
<PAGE>      PAGE  7
062 F000100   0.0
062 G000100   0.0
062 H000100   0.0
062 I000100   0.0
062 J000100   0.0
062 K000100   0.0
062 L000100   0.0
062 M000100   0.0
062 N000100   0.0
062 O000100  99.8
062 P000100   0.0
062 Q000100   0.0
062 R000100   0.0
063 A000100   0
063 B000100 10.0
064 A000100 Y
064 B000100 N
070 A010100 Y
070 A020100 N
070 B010100 N
070 B020100 N
070 C010100 Y
070 C020100 N
070 D010100 Y
070 D020100 N
070 E010100 Y
070 E020100 Y
070 F010100 N
070 F020100 N
070 G010100 Y
070 G020100 Y
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 Y
070 K010100 N
070 K020100 N
070 L010100 N
070 L020100 N
070 M010100 N
070 M020100 N
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 Y
070 Q010100 N
070 Q020100 N
<PAGE>      PAGE  8
070 R010100 N
070 R020100 N
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071 B000100     65551
071 C000100    124709
071 D000100   53
072 A000100 12
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072 E000100        0
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072 K000100       16
072 L000100       19
072 M000100        4
072 N000100       66
072 O000100        0
072 P000100        0
072 Q000100       12
072 R000100        9
072 S000100        4
072 T000100      507
072 U000100        0
072 V000100        0
072 W000100        6
072 X000100     1369
072 Y000100        0
072 Z000100     5499
072AA000100      760
072BB000100      277
072CC010100     3511
072CC020100        0
072DD010100     4500
072DD020100      418
072EE000100        0
073 A010100   0.7107
073 A020100   0.6007
073 B000100   0.0000
073 C000100   0.0000
074 A000100      527
074 B000100        0
074 C000100     1100
074 D000100   137907
074 E000100        0
074 F000100        0
074 G000100        0
074 H000100        0
<PAGE>      PAGE  9
074 I000100        0
074 J000100     2110
074 K000100        0
074 L000100     2294
074 M000100       14
074 N000100   143951
074 O000100     5085
074 P000100       16
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100      732
074 S000100        0
074 T000100   138118
074 U010100     6830
074 U020100      865
074 V010100    15.65
074 V020100    15.65
074 W000100   0.0000
074 X000100     4113
074 Y000100     2176
075 A000100        0
075 B000100   124198
076  000100     0.00
028 A010200      1911
028 A020200       337
028 A030200         0
028 A040200      1661
028 B010200      1934
028 B020200       340
028 B030200         0
028 B040200      1638
028 C010200      1632
028 C020200       340
028 C030200         0
028 C040200      1699
028 D010200      2571
028 D020200       343
028 D030200         0
028 D040200       963
028 E010200      3261
028 E020200       349
028 E030200         0
028 E040200      2530
028 F010200      2768
028 F020200       330
028 F030200         0
028 F040200      1205
028 G010200     14077
028 G020200      2039
<PAGE>      PAGE  10
028 G030200         0
028 G040200      9696
028 H000200      7105
029  000200 Y
030 A000200    197
030 B000200  4.75
030 C000200  0.00
031 A000200     47
031 B000200      0
032  000200    150
033  000200      0
034  000200 Y
035  000200     82
036 A000200 N
036 B000200      0
042 A000200   0
042 B000200   0
042 C000200   0
042 D000200 100
042 E000200   0
042 F000200   0
042 G000200   0
042 H000200   0
043  000200    506
044  000200      0
045  000200 Y
046  000200 N
047  000200 Y
048  000200  0.000
048 A010200   100000
048 A020200 0.450
048 B010200   150000
048 B020200 0.400
048 C010200   250000
048 C020200 0.375
048 D010200        0
048 D020200 0.000
048 E010200        0
048 E020200 0.000
048 F010200        0
048 F020200 0.000
048 G010200        0
048 G020200 0.000
048 H010200        0
048 H020200 0.000
048 I010200        0
048 I020200 0.000
048 J010200        0
048 J020200 0.000
048 K010200   500000
048 K020200 0.350
<PAGE>      PAGE  11
055 A000200 N
055 B000200 N
056  000200 N
057  000200 N
062 A000200 Y
062 B000200   0.0
062 C000200   0.0
062 D000200   0.0
062 E000200   0.0
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
062 K000200   0.0
062 L000200   0.0
062 M000200   0.0
062 N000200   0.0
062 O000200 101.3
062 P000200   0.0
062 Q000200   0.0
062 R000200   0.0
063 A000200   0
063 B000200  9.1
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
<PAGE>      PAGE  12
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
071 A000200    102481
071 B000200     90479
071 C000200    124744
071 D000200   73
072 A000200 12
072 B000200     6659
072 C000200        0
072 D000200        0
072 E000200        0
072 F000200      545
072 G000200        0
072 H000200        0
072 I000200      101
072 J000200       27
072 K000200       20
072 L000200       27
072 M000200        4
072 N000200       45
072 O000200        0
072 P000200        0
072 Q000200       12
072 R000200        9
072 S000200        4
072 T000200      506
072 U000200        0
072 V000200        0
072 W000200        8
072 X000200     1308
072 Y000200       17
072 Z000200     5368
072AA000200     3482
072BB000200     2300
072CC010200     3993
072CC020200        0
072DD010200     4499
072DD020200      922
072EE000200      815
073 A010200   0.8396
073 A020200   0.7035
073 B000200   0.1240
<PAGE>      PAGE  13
073 C000200   0.0000
074 A000200       19
074 B000200        0
074 C000200        0
074 D000200   136815
074 E000200        0
074 F000200        0
074 G000200        0
074 H000200        0
074 I000200        0
074 J000200       99
074 K000200        0
074 L000200     1989
074 M000200       16
074 N000200   138938
074 O000200     3421
074 P000200       15
074 Q000200        0
074 R010200        0
074 R020200        0
074 R030200        0
074 R040200      500
074 S000200        0
074 T000200   135002
074 U010200     5608
074 U020200     1495
074 V010200    18.31
074 V020200    18.32
074 W000200   0.0000
074 X000200     4358
074 Y000200     5470
075 A000200        0
075 B000200   123936
076  000200     0.00
SIGNATURE   GEORGE C. BOWEN                              
TITLE       TREASURER           
 


Return of Capital

The Fund adjusts the  classification of distributions to shareholders to reflect
the differences between financial statement amounts and distributions determined
in accordance with income tax  regulations.  Accordingly,  during the year ended
September  30, 1998,  amounts have been  reclassified  to reflect an increase in
paid-in capital of $420,762,  a decrease in undistributed  net investment income
of $415,198,  and a decrease in accumulated  net realized gain on investments of
$5,564.


Return of Capital

The Fund adjusts the  classification of distributions to shareholders to reflect
the differences between financial statement amounts and distributions determined
in accordance with income tax  regulations.  Accordingly,  during the year ended
September  30,  1998,  amounts have been  reclassified  to reflect a decrease in
undistributed net investment  income of $671,664,  a decrease in accumulated net
realized loss on investments of $321,410,  and an increase in paid-in capital of
$350,254.


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>                                                           12-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            SEP-30-1998
<INVESTMENTS-AT-COST>                                                                 130,010,329
<INVESTMENTS-AT-VALUE>                                                                139,006,596
<RECEIVABLES>                                                                           4,403,711
<ASSETS-OTHER>                                                                             13,645
<OTHER-ITEMS-ASSETS>                                                                      526,963
<TOTAL-ASSETS>                                                                        143,950,915
<PAYABLE-FOR-SECURITIES>                                                                5,085,403
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 747,175
<TOTAL-LIABILITIES>                                                                     5,832,578
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              129,168,432
<SHARES-COMMON-STOCK>                                                                   6,830,303
<SHARES-COMMON-PRIOR>                                                                   5,745,793
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    108,367
<ACCUMULATED-NET-GAINS>                                                                    62,005
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                8,996,267
<NET-ASSETS>                                                                          106,909,030
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       6,868,143
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          1,368,623
<NET-INVESTMENT-INCOME>                                                                 5,499,520
<REALIZED-GAINS-CURRENT>                                                                  482,575
<APPREC-INCREASE-CURRENT>                                                               3,511,405
<NET-CHANGE-FROM-OPS>                                                                   9,493,500
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                               4,499,560
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                 2,064,197
<NUMBER-OF-SHARES-REDEEMED>                                                             1,186,120
<SHARES-REINVESTED>                                                                       206,433
<NET-CHANGE-IN-ASSETS>                                                                 29,377,763
<ACCUMULATED-NII-PRIOR>                                                                   616,172
<ACCUMULATED-GAINS-PRIOR>                                                                (741,980)
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     608,528
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         1,368,623
<AVERAGE-NET-ASSETS>                                                                   97,000,609
<PER-SHARE-NAV-BEGIN>                                                                          15.16
<PER-SHARE-NII>                                                                                 0.69
<PER-SHARE-GAIN-APPREC>                                                                         0.51
<PER-SHARE-DIVIDEND>                                                                            0.71
<PER-SHARE-DISTRIBUTIONS>                                                                       0.00
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            15.65
<EXPENSE-RATIO>                                                                                 0.94
<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 Intermediate Municipal Fund- B
<SERIES>                                                                 
   <NUMBER>          1
   <NAME>            Oppenheimer Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           12-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            SEP-30-1998
<INVESTMENTS-AT-COST>                                                                 130,010,329
<INVESTMENTS-AT-VALUE>                                                                139,006,596
<RECEIVABLES>                                                                           4,403,711
<ASSETS-OTHER>                                                                             13,645
<OTHER-ITEMS-ASSETS>                                                                      526,963
<TOTAL-ASSETS>                                                                        143,950,915
<PAYABLE-FOR-SECURITIES>                                                                5,085,403
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 747,175
<TOTAL-LIABILITIES>                                                                     5,832,578
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              129,168,432
<SHARES-COMMON-STOCK>                                                                     865,057
<SHARES-COMMON-PRIOR>                                                                     507,362
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    108,367
<ACCUMULATED-NET-GAINS>                                                                    62,005
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                8,996,267
<NET-ASSETS>                                                                           13,536,747
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       6,868,143
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          1,368,623
<NET-INVESTMENT-INCOME>                                                                 5,499,520
<REALIZED-GAINS-CURRENT>                                                                  482,575
<APPREC-INCREASE-CURRENT>                                                               3,511,405
<NET-CHANGE-FROM-OPS>                                                                   9,493,500
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                 417,763
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   412,276
<NUMBER-OF-SHARES-REDEEMED>                                                                72,787
<SHARES-REINVESTED>                                                                        18,206
<NET-CHANGE-IN-ASSETS>                                                                 29,377,763
<ACCUMULATED-NII-PRIOR>                                                                   616,172
<ACCUMULATED-GAINS-PRIOR>                                                                (741,980)
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     608,528
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         1,368,623
<AVERAGE-NET-ASSETS>                                                                   10,830,160
<PER-SHARE-NAV-BEGIN>                                                                          15.16
<PER-SHARE-NII>                                                                                 0.60
<PER-SHARE-GAIN-APPREC>                                                                         0.49
<PER-SHARE-DIVIDEND>                                                                            0.60
<PER-SHARE-DISTRIBUTIONS>                                                                       0.00
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            15.65
<EXPENSE-RATIO>                                                                                 1.69
<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>                                                           12-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            SEP-30-1998
<INVESTMENTS-AT-COST>                                                                 130,010,329
<INVESTMENTS-AT-VALUE>                                                                139,006,596
<RECEIVABLES>                                                                           4,403,711
<ASSETS-OTHER>                                                                             13,645
<OTHER-ITEMS-ASSETS>                                                                      526,963
<TOTAL-ASSETS>                                                                        143,950,915
<PAYABLE-FOR-SECURITIES>                                                                5,085,403
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 747,175
<TOTAL-LIABILITIES>                                                                     5,832,578
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              129,168,432
<SHARES-COMMON-STOCK>                                                                   1,131,105
<SHARES-COMMON-PRIOR>                                                                     921,116
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    108,367
<ACCUMULATED-NET-GAINS>                                                                    62,005
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                                8,996,267
<NET-ASSETS>                                                                           17,672,560
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       6,868,143
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          1,368,623
<NET-INVESTMENT-INCOME>                                                                 5,499,520
<REALIZED-GAINS-CURRENT>                                                                  482,575
<APPREC-INCREASE-CURRENT>                                                               3,511,405
<NET-CHANGE-FROM-OPS>                                                                   9,493,500
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                 635,072
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   517,496
<NUMBER-OF-SHARES-REDEEMED>                                                               339,701
<SHARES-REINVESTED>                                                                        32,194
<NET-CHANGE-IN-ASSETS>                                                                 29,377,763
<ACCUMULATED-NII-PRIOR>                                                                   616,172
<ACCUMULATED-GAINS-PRIOR>                                                                (741,980)
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     608,528
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         1,368,623
<AVERAGE-NET-ASSETS>                                                                   16,366,969
<PER-SHARE-NAV-BEGIN>                                                                          15.13
<PER-SHARE-NII>                                                                                 0.59
<PER-SHARE-GAIN-APPREC>                                                                         0.50
<PER-SHARE-DIVIDEND>                                                                            0.60
<PER-SHARE-DISTRIBUTIONS>                                                                       0.00
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            15.62
<EXPENSE-RATIO>                                                                                 1.69
<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 Insured Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           12-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            SEP-30-1998
<INVESTMENTS-AT-COST>                                                                 126,698,612
<INVESTMENTS-AT-VALUE>                                                                136,814,489
<RECEIVABLES>                                                                           2,088,592
<ASSETS-OTHER>                                                                             16,310
<OTHER-ITEMS-ASSETS>                                                                       18,819
<TOTAL-ASSETS>                                                                        138,938,210
<PAYABLE-FOR-SECURITIES>                                                                3,421,063
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 514,964
<TOTAL-LIABILITIES>                                                                     3,936,027
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              124,052,041
<SHARES-COMMON-STOCK>                                                                   5,607,969
<SHARES-COMMON-PRIOR>                                                                   5,138,201
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    297,350
<ACCUMULATED-NET-GAINS>                                                                 1,131,615
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                               10,115,877
<NET-ASSETS>                                                                          102,687,383
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       6,659,055
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          1,290,686
<NET-INVESTMENT-INCOME>                                                                 5,368,369
<REALIZED-GAINS-CURRENT>                                                                1,181,782
<APPREC-INCREASE-CURRENT>                                                               3,993,214
<NET-CHANGE-FROM-OPS>                                                                  10,543,365
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                               4,498,622
<DISTRIBUTIONS-OF-GAINS>                                                                  646,115
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   955,728
<NUMBER-OF-SHARES-REDEEMED>                                                               698,348
<SHARES-REINVESTED>                                                                       212,388
<NET-CHANGE-IN-ASSETS>                                                                 21,422,974
<ACCUMULATED-NII-PRIOR>                                                                   310,788
<ACCUMULATED-GAINS-PRIOR>                                                                 770,265
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     545,563
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         1,308,234
<AVERAGE-NET-ASSETS>                                                                   96,458,000
<PER-SHARE-NAV-BEGIN>                                                                          17.72
<PER-SHARE-NII>                                                                                 0.80
<PER-SHARE-GAIN-APPREC>                                                                         0.75
<PER-SHARE-DIVIDEND>                                                                            0.84
<PER-SHARE-DISTRIBUTIONS>                                                                       0.12
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            18.31
<EXPENSE-RATIO>                                                                                 0.88
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6                       
<CIK>                799102
<NAME>               Oppenheimer Insured Municipal Fund -B
<SERIES>                                                                 
   <NUMBER>          2
   <NAME>            Oppenheimer Insured Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           12-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            SEP-30-1998
<INVESTMENTS-AT-COST>                                                                 126,698,612
<INVESTMENTS-AT-VALUE>                                                                136,814,489
<RECEIVABLES>                                                                           2,088,592
<ASSETS-OTHER>                                                                             16,310
<OTHER-ITEMS-ASSETS>                                                                       18,819
<TOTAL-ASSETS>                                                                        138,938,210
<PAYABLE-FOR-SECURITIES>                                                                3,421,063
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 514,964
<TOTAL-LIABILITIES>                                                                     3,936,027
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              124,052,041
<SHARES-COMMON-STOCK>                                                                   1,495,409
<SHARES-COMMON-PRIOR>                                                                   1,126,768
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    297,350
<ACCUMULATED-NET-GAINS>                                                                 1,131,615
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                               10,115,877
<NET-ASSETS>                                                                           27,391,541
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       6,659,055
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          1,290,686
<NET-INVESTMENT-INCOME>                                                                 5,368,369
<REALIZED-GAINS-CURRENT>                                                                1,181,782
<APPREC-INCREASE-CURRENT>                                                               3,993,214
<NET-CHANGE-FROM-OPS>                                                                  10,543,365
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                 921,805
<DISTRIBUTIONS-OF-GAINS>                                                                  149,337
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   543,004
<NUMBER-OF-SHARES-REDEEMED>                                                               213,910
<SHARES-REINVESTED>                                                                        39,547
<NET-CHANGE-IN-ASSETS>                                                                 21,422,974
<ACCUMULATED-NII-PRIOR>                                                                   310,788
<ACCUMULATED-GAINS-PRIOR>                                                                 770,265
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     545,563
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         1,308,234
<AVERAGE-NET-ASSETS>                                                                   23,817,000
<PER-SHARE-NAV-BEGIN>                                                                          17.73
<PER-SHARE-NII>                                                                                 0.67
<PER-SHARE-GAIN-APPREC>                                                                         0.74
<PER-SHARE-DIVIDEND>                                                                            0.70
<PER-SHARE-DISTRIBUTIONS>                                                                       0.12
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            18.32
<EXPENSE-RATIO>                                                                                 1.64
<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>

<CIK>                                                                                                                               
                              799102
<NAME>               Oppenheimer Insured Municipal Fund - C
<SERIES>                                                                 
   <NUMBER>          2
   <NAME>            Oppenheimer Insured Municipal Fund
       
<S>                                                                     <C>
<PERIOD-TYPE>                                                           12-MOS
<FISCAL-YEAR-END>                                                       SEP-30-1998
<PERIOD-START>                                                          OCT-01-1997
<PERIOD-END>                                                            SEP-30-1998
<INVESTMENTS-AT-COST>                                                                 126,698,612
<INVESTMENTS-AT-VALUE>                                                                136,814,489
<RECEIVABLES>                                                                           2,088,592
<ASSETS-OTHER>                                                                             16,310
<OTHER-ITEMS-ASSETS>                                                                       18,819
<TOTAL-ASSETS>                                                                        138,938,210
<PAYABLE-FOR-SECURITIES>                                                                3,421,063
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                                 514,964
<TOTAL-LIABILITIES>                                                                     3,936,027
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              124,052,041
<SHARES-COMMON-STOCK>                                                                     268,917
<SHARES-COMMON-PRIOR>                                                                     144,171
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    297,350
<ACCUMULATED-NET-GAINS>                                                                 1,131,615
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                               10,115,877
<NET-ASSETS>                                                                            4,923,259
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                       6,659,055
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          1,290,686
<NET-INVESTMENT-INCOME>                                                                 5,368,369
<REALIZED-GAINS-CURRENT>                                                                1,181,782
<APPREC-INCREASE-CURRENT>                                                               3,993,214
<NET-CHANGE-FROM-OPS>                                                                  10,543,365
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                 140,882
<DISTRIBUTIONS-OF-GAINS>                                                                   19,416
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   156,606
<NUMBER-OF-SHARES-REDEEMED>                                                                39,038
<SHARES-REINVESTED>                                                                         7,178
<NET-CHANGE-IN-ASSETS>                                                                 21,422,974
<ACCUMULATED-NII-PRIOR>                                                                   310,788
<ACCUMULATED-GAINS-PRIOR>                                                                 770,265
<OVERDISTRIB-NII-PRIOR>                                                                         0
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                     545,563
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         1,308,234
<AVERAGE-NET-ASSETS>                                                                    3,661,000
<PER-SHARE-NAV-BEGIN>                                                                          17.72
<PER-SHARE-NII>                                                                                 0.70
<PER-SHARE-GAIN-APPREC>                                                                         0.71
<PER-SHARE-DIVIDEND>                                                                            0.70
<PER-SHARE-DISTRIBUTIONS>                                                                       0.12
<RETURNS-OF-CAPITAL>                                                                            0.00
<PER-SHARE-NAV-END>                                                                            18.31
<EXPENSE-RATIO>                                                                                 1.64
<AVG-DEBT-OUTSTANDING>                                                                          0
<AVG-DEBT-PER-SHARE>                                                                            0.00
        

</TABLE>

Independant Auditors Report


October 21, 1998

To the Board of Trustees of
Oppenheimer Insured Municipal Fund:

In planning and performing our audit of the financial  statements of Oppenheimer
Insured  Municipal  Fund (the "Fund") for the year ended  September 30, 1998 (on
which we have issued our report  dated  October 21,  1998),  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 Fund's internal control.

The  management of the Fund 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,  error or fraud may
occur and not be  detected.  Also,  projection  of any  evaluation  of  internal
control to future  periods is subject to the risk that it may become  inadequate
because of changes in  conditions  or that the  effectiveness  of the design and
operation may deteriorate.

Our consideration of the Fund's internal control would not necessarily  disclose
all  matters  in  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  misstatements  caused  by errors 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 Fund'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, 1998.

This report is intended solely for the  information  and use of management,  the
Board of Trustees of Oppenheimer  Insured Municipal Fund, and the Securities and
Exchange Commission.

Yours truly,






Independant Auditors Report


October 21, 1998

To the Board of Trustees of
Oppenheimer Intermediate Municipal Fund:

In planning and performing our audit of the financial  statements of Oppenheimer
Intermediate  Municipal Fund (the "Fund") for the year ended  September 30, 1998
(on which we have issued our report dated October 21, 1998),  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 Fund's internal control.

The  management of the Fund 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,  error or fraud may
occur and not be  detected.  Also,  projection  of any  evaluation  of  internal
control to future  periods is subject to the risk that it may become  inadequate
because of changes in  conditions  or that the  effectiveness  of the design and
operation may deteriorate.

Our consideration of the Fund's internal control would not necessarily  disclose
all  matters  in  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 misstatements 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
Fund'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, 1998.

This report is intended solely for the  information  and use of management,  the
Board of Trustees of Oppenheimer Intermediate Municipal Fund, and the Securities
and Exchange Commission.

Yours truly,







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