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<PAGE> PAGE 8
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<PAGE> PAGE 9
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 17
SIGNATURE BRIAN W. WIXTED
TITLE TREASURER
As of April 1, 2000, the Manager withdrew its voluntary undertaking to limit its
management fee to a maximum annual rate of 0.40%.
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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<CIK> 823483
<NAME> OPP. MAIN STREET CALIFORNIA MUNICIPAL FUND-A
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<NAME> OPPENHEIMER MAIN STREET FUNDS, INC.
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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<ACCUM-APPREC-OR-DEPREC> (3,032,517)
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<EXPENSES-NET> 476,531
<NET-INVESTMENT-INCOME> 3,538,941
<REALIZED-GAINS-CURRENT> (4,365,674)
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<NET-CHANGE-FROM-OPS> (3,062,820)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 630,746
<DISTRIBUTIONS-OF-GAINS> 17,172
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<NUMBER-OF-SHARES-REDEEMED> 490,459
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<NET-CHANGE-IN-ASSETS> (18,024,130)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (28,997)
<OVERDISTRIB-NII-PRIOR> 284,048
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 362,042
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 581,038
<AVERAGE-NET-ASSETS> 28,682,000
<PER-SHARE-NAV-BEGIN> 12.20
<PER-SHARE-NII> 0.27
<PER-SHARE-GAIN-APPREC> (0.58)
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<PER-SHARE-DISTRIBUTIONS> 0.01
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<PER-SHARE-NAV-END> 11.62
<EXPENSE-RATIO> 1.52
[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> 823483
<NAME> Oppenheimer Main Street Growth & Income Fund - A
<SERIES>
<NUMBER> 2
<NAME> Oppenheimer Main Street Funds, Inc
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> SEP-01-1999
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<INVESTMENTS-AT-COST> 14,393,488,499
<INVESTMENTS-AT-VALUE> 17,714,995,866
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<ACCUMULATED-NII-PRIOR> 0
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<GROSS-EXPENSE> 113,706,877
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<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> 823483
<NAME> Oppenheimer Main Street Growth & Income Fund - B
<SERIES>
<NUMBER> 2
<NAME> Oppenheimer Main Street Funds, Inc
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
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<INVESTMENTS-AT-COST> 14,393,488,499
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<DISTRIBUTIONS-OF-GAINS> 767,525,149
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<ACCUMULATED-GAINS-PRIOR> 1,806,189,385
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<GROSS-ADVISORY-FEES> 40,025,408
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 113,706,877
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<PER-SHARE-NAV-BEGIN> 42.42
<PER-SHARE-NII> (0.02)
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<EXPENSE-RATIO> 1.65
[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> 823483
<NAME> Oppenheimer Main Street Growth & Income Fund - C
<SERIES>
<NUMBER> 2
<NAME> Oppenheimer Main Street Funds, Inc
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
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<OVERDISTRIB-NII-PRIOR> 3
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<GROSS-ADVISORY-FEES> 40,025,408
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<GROSS-EXPENSE> 113,706,877
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<PER-SHARE-NII> (0.02)
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<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> 823483
<NAME> Oppenheimer Main Street Growth & Income Fund - Y
<SERIES>
<NUMBER> 2
<NAME> Oppenheimer Main Street Funds, Inc
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
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<SHARES-REINVESTED> 458,845
<NET-CHANGE-IN-ASSETS> 942,360,211
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1,806,189,385
<OVERDISTRIB-NII-PRIOR> 3
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 40,025,408
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 113,706,877
<AVERAGE-NET-ASSETS> 179,000,000
<PER-SHARE-NAV-BEGIN> 43.00
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<PER-SHARE-NAV-END> 39.89
<EXPENSE-RATIO> 0.68
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
