[ARTICLE] 6
[CIK] 799102
[NAME] Oppenheimer Insured Municipal Fund - C
[SERIES]
[NUMBER] 2
[NAME] Oppenheimer Insured Municipal Fund
<TABLE>
<S> <C>
[PERIOD-TYPE] 6-MOS
[FISCAL-YEAR-END] SEP-30-2000
[PERIOD-START] OCT-01-1999
[PERIOD-END] Mar-31-2000
[INVESTMENTS-AT-COST] 117,840,298
[INVESTMENTS-AT-VALUE] 120,737,813
[RECEIVABLES] 1,883,127
[ASSETS-OTHER] 7,415
[OTHER-ITEMS-ASSETS] 349,673
[TOTAL-ASSETS] 122,978,028
[PAYABLE-FOR-SECURITIES] 3,861,640
[SENIOR-LONG-TERM-DEBT] 0
[OTHER-ITEMS-LIABILITIES] 857,738
[TOTAL-LIABILITIES] 4,719,378
[SENIOR-EQUITY] 0
[PAID-IN-CAPITAL-COMMON] 124,639,829
[SHARES-COMMON-STOCK] 261,373
[SHARES-COMMON-PRIOR] 340,547
[ACCUMULATED-NII-CURRENT] 0
[OVERDISTRIBUTION-NII] 157,797
[ACCUMULATED-NET-GAINS] (8,792,272)
[OVERDISTRIBUTION-GAINS] 0
[ACCUM-APPREC-OR-DEPREC] 2,568,890
[NET-ASSETS] 4,213,061
[DIVIDEND-INCOME] 0
[INTEREST-INCOME] 3,689,687
[OTHER-INCOME] 0
[EXPENSES-NET] 697,951
[NET-INVESTMENT-INCOME] 2,991,736
[REALIZED-GAINS-CURRENT] (8,165,777)
[APPREC-INCREASE-CURRENT] 5,338,548
[NET-CHANGE-FROM-OPS] 164,507
[EQUALIZATION] 0
[DISTRIBUTIONS-OF-INCOME] 102,941
[DISTRIBUTIONS-OF-GAINS] 0
[DISTRIBUTIONS-OTHER] 0
[NUMBER-OF-SHARES-SOLD] 21,161
[NUMBER-OF-SHARES-REDEEMED] 104,393
[SHARES-REINVESTED] 4,058
[NET-CHANGE-IN-ASSETS] (11,851,087)
[ACCUMULATED-NII-PRIOR] 0
[ACCUMULATED-GAINS-PRIOR] (626,495)
[OVERDISTRIB-NII-PRIOR] 82,803
[OVERDIST-NET-GAINS-PRIOR] 0
[GROSS-ADVISORY-FEES] 270,710
[INTEREST-EXPENSE] 0
[GROSS-EXPENSE] 704,680
[AVERAGE-NET-ASSETS] 4,766,000
[PER-SHARE-NAV-BEGIN] 16.48
[PER-SHARE-NII] 0.34
[PER-SHARE-GAIN-APPREC] (0.35)
[PER-SHARE-DIVIDEND] 0.35
[PER-SHARE-DISTRIBUTIONS] 0.00
[RETURNS-OF-CAPITAL] 0.00
[PER-SHARE-NAV-END] 16.12
[EXPENSE-RATIO] 1.74
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
