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<NUMBER-OF-SHARES-REDEEMED> 367,694
<SHARES-REINVESTED> 59,086
<NET-CHANGE-IN-ASSETS> 6,319,696
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (1,749)
<OVERDISTRIB-NII-PRIOR> 351,652
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 770,241
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1,219,840
<AVERAGE-NET-ASSETS> 28,070,000
<PER-SHARE-NAV-BEGIN> 13.01
<PER-SHARE-NII> 0.53
<PER-SHARE-GAIN-APPREC> (0.83)
<PER-SHARE-DIVIDEND> 0.51
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 12.20
<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 Income & Growth Fund - A
<SERIES>
<NUMBER> 2
<NAME> Oppenheimer Main Street Funds, Inc
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 13,190,923,838
<INVESTMENTS-AT-VALUE> 16,606,606,972
<RECEIVABLES> 401,716,736
<ASSETS-OTHER> 233,950
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 17,008,557,658
<PAYABLE-FOR-SECURITIES> 173,733,602
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 39,316,434
<TOTAL-LIABILITIES> 213,050,036
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11,573,678,459
<SHARES-COMMON-STOCK> 180,068,518
<SHARES-COMMON-PRIOR> 152,645,006
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 3
<ACCUMULATED-NET-GAINS> 1,806,189,385
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,415,639,781
<NET-ASSETS> 7,723,606,539
<DIVIDEND-INCOME> 152,565,279
<INTEREST-INCOME> 48,617,905
<OTHER-INCOME> 0
<EXPENSES-NET> 186,615,459
<NET-INVESTMENT-INCOME> 14,567,725
<REALIZED-GAINS-CURRENT> 1,817,354,650
<APPREC-INCREASE-CURRENT> 2,243,718,581
<NET-CHANGE-FROM-OPS> 4,075,640,956
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 24,187,140
<DISTRIBUTIONS-OF-GAINS> 234,009,868
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 52,580,490
<NUMBER-OF-SHARES-REDEEMED> 31,752,422
<SHARES-REINVESTED> 6,595,444
<NET-CHANGE-IN-ASSETS> 6,496,437,711
<ACCUMULATED-NII-PRIOR> 7,487,787
<ACCUMULATED-GAINS-PRIOR> 486,700,405
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 65,199,139
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 186,703,093
<AVERAGE-NET-ASSETS> 6,722,000,000
<PER-SHARE-NAV-BEGIN> 32.32
<PER-SHARE-NII> 0.19
<PER-SHARE-GAIN-APPREC> 12.03
<PER-SHARE-DIVIDEND> 0.15
<PER-SHARE-DISTRIBUTIONS> 1.50
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 42.89
<EXPENSE-RATIO> 0.91
[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 Income & Growth Fund - B
<SERIES>
<NUMBER> 2
<NAME> Oppenheimer Main Street Funds, Inc
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 13,190,923,838
<INVESTMENTS-AT-VALUE> 16,606,606,972
<RECEIVABLES> 401,716,736
<ASSETS-OTHER> 233,950
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 17,008,557,658
<PAYABLE-FOR-SECURITIES> 173,733,602
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 39,316,434
<TOTAL-LIABILITIES> 213,050,036
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11,573,678,459
<SHARES-COMMON-STOCK> 166,728,971
<SHARES-COMMON-PRIOR> 129,966,667
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 3
<ACCUMULATED-NET-GAINS> 1,806,189,385
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,415,639,781
<NET-ASSETS> 7,072,717,665
<DIVIDEND-INCOME> 152,565,279
<INTEREST-INCOME> 48,617,905
<OTHER-INCOME> 0
<EXPENSES-NET> 186,615,459
<NET-INVESTMENT-INCOME> 14,567,725
<REALIZED-GAINS-CURRENT> 1,817,354,650
<APPREC-INCREASE-CURRENT> 2,243,718,581
<NET-CHANGE-FROM-OPS> 4,075,640,956
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 203,350,853
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 52,000,058
<NUMBER-OF-SHARES-REDEEMED> 20,423,510
<SHARES-REINVESTED> 5,185,756
<NET-CHANGE-IN-ASSETS> 6,496,437,711
<ACCUMULATED-NII-PRIOR> 7,487,787
<ACCUMULATED-GAINS-PRIOR> 486,700,405
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 65,199,139
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 186,703,093
<AVERAGE-NET-ASSETS> 5,930,000,000
<PER-SHARE-NAV-BEGIN> 32.07
<PER-SHARE-NII> (0.08)
<PER-SHARE-GAIN-APPREC> 11.93
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 1.50
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 42.42
<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 Income & Growth Fund - C
<SERIES>
<NUMBER> 2
<NAME> Oppenheimer Main Street Funds, Inc
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 13,190,923,838
<INVESTMENTS-AT-VALUE> 16,606,606,972
<RECEIVABLES> 401,716,736
<ASSETS-OTHER> 233,950
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 17,008,557,658
<PAYABLE-FOR-SECURITIES> 173,733,602
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 39,316,434
<TOTAL-LIABILITIES> 213,050,036
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11,573,678,459
<SHARES-COMMON-STOCK> 43,635,677
<SHARES-COMMON-PRIOR> 35,695,727
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 3
<ACCUMULATED-NET-GAINS> 1,806,189,385
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,415,639,781
<NET-ASSETS> 1,850,786,677
<DIVIDEND-INCOME> 152,565,279
<INTEREST-INCOME> 48,617,905
<OTHER-INCOME> 0
<EXPENSES-NET> 186,615,459
<NET-INVESTMENT-INCOME> 14,567,725
<REALIZED-GAINS-CURRENT> 1,817,354,650
<APPREC-INCREASE-CURRENT> 2,243,718,581
<NET-CHANGE-FROM-OPS> 4,075,640,956
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 54,987,485
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 13,350,165
<NUMBER-OF-SHARES-REDEEMED> 6,809,689
<SHARES-REINVESTED> 1,399,474
<NET-CHANGE-IN-ASSETS> 6,496,437,711
<ACCUMULATED-NII-PRIOR> 7,487,787
<ACCUMULATED-GAINS-PRIOR> 486,700,405
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 65,199,139
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 186,703,093
<AVERAGE-NET-ASSETS> 1,583,000,000
<PER-SHARE-NAV-BEGIN> 32.07
<PER-SHARE-NII> (0.09)
<PER-SHARE-GAIN-APPREC> 11.93
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 1.50
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 42.41
<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 Income & Growth Fund - Y
<SERIES>
<NUMBER> 2
<NAME> Oppenheimer Main Street Funds, Inc
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 13,190,923,838
<INVESTMENTS-AT-VALUE> 16,606,606,972
<RECEIVABLES> 401,716,736
<ASSETS-OTHER> 233,950
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 17,008,557,658
<PAYABLE-FOR-SECURITIES> 173,733,602
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 39,316,434
<TOTAL-LIABILITIES> 213,050,036
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11,573,678,459
<SHARES-COMMON-STOCK> 3,451,401
<SHARES-COMMON-PRIOR> 1,638,791
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 3
<ACCUMULATED-NET-GAINS> 1,806,189,385
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3,415,639,781
<NET-ASSETS> 148,396,741
<DIVIDEND-INCOME> 152,565,279
<INTEREST-INCOME> 48,617,905
<OTHER-INCOME> 0
<EXPENSES-NET> 186,615,459
<NET-INVESTMENT-INCOME> 14,567,725
<REALIZED-GAINS-CURRENT> 1,817,354,650
<APPREC-INCREASE-CURRENT> 2,243,718,581
<NET-CHANGE-FROM-OPS> 4,075,640,956
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 366,378
<DISTRIBUTIONS-OF-GAINS> 3,019,461
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,655,008
<NUMBER-OF-SHARES-REDEEMED> 933,166
<SHARES-REINVESTED> 90,768
<NET-CHANGE-IN-ASSETS> 6,496,437,711
<ACCUMULATED-NII-PRIOR> 7,487,787
<ACCUMULATED-GAINS-PRIOR> 486,700,405
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 65,199,139
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 186,703,093
<AVERAGE-NET-ASSETS> 99,000,000
<PER-SHARE-NAV-BEGIN> 32.38
<PER-SHARE-NII> 0.24
<PER-SHARE-GAIN-APPREC> 12.07
<PER-SHARE-DIVIDEND> 0.19
<PER-SHARE-DISTRIBUTIONS> 1.50
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 43.00
<EXPENSE-RATIO> 0.77
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0.00
</TABLE>
<PAGE>
To the Board of Trustees of Oppenheimer Main Street California Municipal Fund:
In planning and performing our audit of the financial statements of Oppenheimer
Main Street California Municipal Fund for the year ended August 31, 1999 (on
which we have issued our report dated September 22, 1999), 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, misstatements due to
error or fraud may occur and not be detected. Also, projections of any
evaluation of internal control to future periods are subject to the risk that
the internal control may become inadequate because of changes in conditions, or
that the degree of compliance with policies or procedures may deteriorate.
Our consideration of the Fund's internal control would not necessarily disclose
all matters in the 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
August 31, 1999.
This report is intended solely for the information and use of management, the
Board of Trustees, and the Securities and Exchange Commission and is not
intended to be and should not be used by anyone other than these specified
parties.
Deloitte & Touche LLP
Denver, Colorado
September 22, 1999
<PAGE>
To the Board of Trustees of Oppenheimer Main Street Growth & Income Fund:
In planning and performing our audit of the financial statements of Oppenheimer
Main Street Growth & Income Fund for the year ended August 31, 1999 (on which we
have issued our report dated September 22, 1999), 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, misstatements due to
error or fraud may occur and not be detected. Also, projections of any
evaluation of internal control to future periods are subject to the risk that
the internal control may become inadequate because of changes in conditions, or
that the degree of compliance with policies or procedures may deteriorate.
Our consideration of the Fund's internal control would not necessarily disclose
all matters in the 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
August 31, 1999.
This report is intended solely for the information and use of management, the
Board of Trustees, and the Securities and Exchange Commission and is not
intended to be and should not be used by anyone other than these specified
parties.
Deloitte & Touche LLP
Denver, Colorado
September 22, 1999
<PAGE>
The Fund adjusts the classification of distributions to shareholders to
reflect the differences between finanical statement amounts and distributions
determined in accordance with income tax regulations. Accordingly, during the
year ended August 31, 1999, amounts have been reclassified to reflect a decrease
in overdistributed net investment income of $2,498,003. Accumulated net realized
gain on investments was decreased by the same amount.
