OPPENHEIMER CALIFORNIA MUNICIPAL FUND
NSAR-A, 2000-03-31
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022 C000004      8700
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SIGNATURE   BRIAN W. WIXTED
TITLE       TREASURER


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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK>               837441
<NAME>              OPPENHEIMER CALIFORNIA MUNICIPAL FUND-A

<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       JUL-31-2000
<PERIOD-START>                                                          AUG-01-1999
<PERIOD-END>                                                            JAN-31-2000
<INVESTMENTS-AT-COST>                                                                 405,127,975
<INVESTMENTS-AT-VALUE>                                                                391,248,398
<RECEIVABLES>                                                                           6,679,506
<ASSETS-OTHER>                                                                             10,249
<OTHER-ITEMS-ASSETS>                                                                    1,768,437
<TOTAL-ASSETS>                                                                        399,706,590
<PAYABLE-FOR-SECURITIES>                                                                2,003,396
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                               2,843,068
<TOTAL-LIABILITIES>                                                                     4,846,464
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              423,162,561
<SHARES-COMMON-STOCK>                                                                  28,029,768
<SHARES-COMMON-PRIOR>                                                                  29,941,203
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    950,895
<ACCUMULATED-NET-GAINS>                                                               (13,657,121)
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                              (13,694,419)
<NET-ASSETS>                                                                          271,115,987
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                      13,592,960
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          2,493,019
<NET-INVESTMENT-INCOME>                                                                11,099,941
<REALIZED-GAINS-CURRENT>                                                              (13,008,721)
<APPREC-INCREASE-CURRENT>                                                             (25,859,618)
<NET-CHANGE-FROM-OPS>                                                                 (27,768,398)
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                               7,884,363
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                 2,265,606
<NUMBER-OF-SHARES-REDEEMED>                                                             4,637,740
<SHARES-REINVESTED>                                                                       460,699
<NET-CHANGE-IN-ASSETS>                                                                (71,129,518)
<ACCUMULATED-NII-PRIOR>                                                                         0
<ACCUMULATED-GAINS-PRIOR>                                                                (648,400)
<OVERDISTRIB-NII-PRIOR>                                                                 1,088,872
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                   1,223,433
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         2,504,329
<AVERAGE-NET-ASSETS>                                                                  297,257,000
<PER-SHARE-NAV-BEGIN>                                                                       10.57
<PER-SHARE-NII>                                                                              0.27
<PER-SHARE-GAIN-APPREC>                                                                     (0.90)
<PER-SHARE-DIVIDEND>                                                                         0.27
<PER-SHARE-DISTRIBUTIONS>                                                                    0.00
<RETURNS-OF-CAPITAL>                                                                         0.00
<PER-SHARE-NAV-END>                                                                          9.67
<EXPENSE-RATIO>                                                                              0.90
[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>               837441
<NAME>              OPPENHEIMER CALIFORNIA MUNICIPAL FUND-B

<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       JUL-31-2000
<PERIOD-START>                                                          AUG-01-1999
<PERIOD-END>                                                            JAN-31-2000
<INVESTMENTS-AT-COST>                                                                 405,127,975
<INVESTMENTS-AT-VALUE>                                                                391,248,398
<RECEIVABLES>                                                                           6,679,506
<ASSETS-OTHER>                                                                             10,249
<OTHER-ITEMS-ASSETS>                                                                    1,768,437
<TOTAL-ASSETS>                                                                        399,706,590
<PAYABLE-FOR-SECURITIES>                                                                2,003,396
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                               2,843,068
<TOTAL-LIABILITIES>                                                                     4,846,464
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              423,162,561
<SHARES-COMMON-STOCK>                                                                  11,338,844
<SHARES-COMMON-PRIOR>                                                                  12,560,331
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    950,895
<ACCUMULATED-NET-GAINS>                                                               (13,657,121)
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                              (13,694,419)
<NET-ASSETS>                                                                          109,713,187
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                      13,592,960
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          2,493,019
<NET-INVESTMENT-INCOME>                                                                11,099,941
<REALIZED-GAINS-CURRENT>                                                              (13,008,721)
<APPREC-INCREASE-CURRENT>                                                             (25,859,618)
<NET-CHANGE-FROM-OPS>                                                                 (27,768,398)
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                               2,726,647
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   726,465
<NUMBER-OF-SHARES-REDEEMED>                                                             2,115,668
<SHARES-REINVESTED>                                                                       167,716
<NET-CHANGE-IN-ASSETS>                                                                (71,129,518)
<ACCUMULATED-NII-PRIOR>                                                                         0
<ACCUMULATED-GAINS-PRIOR>                                                                (648,400)
<OVERDISTRIB-NII-PRIOR>                                                                 1,088,872
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                   1,223,433
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         2,504,329
<AVERAGE-NET-ASSETS>                                                                  122,265,000
<PER-SHARE-NAV-BEGIN>                                                                       10.57
<PER-SHARE-NII>                                                                              0.23
<PER-SHARE-GAIN-APPREC>                                                                     (0.89)
<PER-SHARE-DIVIDEND>                                                                         0.23
<PER-SHARE-DISTRIBUTIONS>                                                                    0.00
<RETURNS-OF-CAPITAL>                                                                         0.00
<PER-SHARE-NAV-END>                                                                          9.68
<EXPENSE-RATIO>                                                                              1.66
[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>               837441
<NAME>              OPPENHEIMER CALIFORNIA MUNICIPAL FUND-C

<S>                                                                     <C>
<PERIOD-TYPE>                                                           6-MOS
<FISCAL-YEAR-END>                                                       JUL-31-2000
<PERIOD-START>                                                          AUG-01-1999
<PERIOD-END>                                                            JAN-31-2000
<INVESTMENTS-AT-COST>                                                                 405,127,975
<INVESTMENTS-AT-VALUE>                                                                391,248,398
<RECEIVABLES>                                                                           6,679,506
<ASSETS-OTHER>                                                                             10,249
<OTHER-ITEMS-ASSETS>                                                                    1,768,437
<TOTAL-ASSETS>                                                                        399,706,590
<PAYABLE-FOR-SECURITIES>                                                                2,003,396
<SENIOR-LONG-TERM-DEBT>                                                                         0
<OTHER-ITEMS-LIABILITIES>                                                               2,843,068
<TOTAL-LIABILITIES>                                                                     4,846,464
<SENIOR-EQUITY>                                                                                 0
<PAID-IN-CAPITAL-COMMON>                                                              423,162,561
<SHARES-COMMON-STOCK>                                                                   1,452,580
<SHARES-COMMON-PRIOR>                                                                   1,598,190
<ACCUMULATED-NII-CURRENT>                                                                       0
<OVERDISTRIBUTION-NII>                                                                    950,895
<ACCUMULATED-NET-GAINS>                                                               (13,657,121)
<OVERDISTRIBUTION-GAINS>                                                                        0
<ACCUM-APPREC-OR-DEPREC>                                                              (13,694,419)
<NET-ASSETS>                                                                           14,030,952
<DIVIDEND-INCOME>                                                                               0
<INTEREST-INCOME>                                                                      13,592,960
<OTHER-INCOME>                                                                                  0
<EXPENSES-NET>                                                                          2,493,019
<NET-INVESTMENT-INCOME>                                                                11,099,941
<REALIZED-GAINS-CURRENT>                                                              (13,008,721)
<APPREC-INCREASE-CURRENT>                                                             (25,859,618)
<NET-CHANGE-FROM-OPS>                                                                 (27,768,398)
<EQUALIZATION>                                                                                  0
<DISTRIBUTIONS-OF-INCOME>                                                                 350,954
<DISTRIBUTIONS-OF-GAINS>                                                                        0
<DISTRIBUTIONS-OTHER>                                                                           0
<NUMBER-OF-SHARES-SOLD>                                                                   218,864
<NUMBER-OF-SHARES-REDEEMED>                                                               386,780
<SHARES-REINVESTED>                                                                        22,306
<NET-CHANGE-IN-ASSETS>                                                                (71,129,518)
<ACCUMULATED-NII-PRIOR>                                                                         0
<ACCUMULATED-GAINS-PRIOR>                                                                (648,400)
<OVERDISTRIB-NII-PRIOR>                                                                 1,088,872
<OVERDIST-NET-GAINS-PRIOR>                                                                      0
<GROSS-ADVISORY-FEES>                                                                   1,223,433
<INTEREST-EXPENSE>                                                                              0
<GROSS-EXPENSE>                                                                         2,504,329
<AVERAGE-NET-ASSETS>                                                                   15,688,000
<PER-SHARE-NAV-BEGIN>                                                                       10.55
<PER-SHARE-NII>                                                                              0.23
<PER-SHARE-GAIN-APPREC>                                                                     (0.89)
<PER-SHARE-DIVIDEND>                                                                         0.23
<PER-SHARE-DISTRIBUTIONS>                                                                    0.00
<RETURNS-OF-CAPITAL>                                                                         0.00
<PER-SHARE-NAV-END>                                                                          9.66
<EXPENSE-RATIO>                                                                              1.66
[AVG-DEBT-OUTSTANDING]                                                                          0
[AVG-DEBT-PER-SHARE]                                                                         0.00


</TABLE>


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