WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000319460
<NAME> SMITH BARNEY MANAGED MUNICIPAL FUND INC.
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> FEB-29-2000
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 3,034,834,643
<INVESTMENTS-AT-VALUE> 2,854,307,054
<RECEIVABLES> 38,975,270
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 2,893,282,324
<PAYABLE-FOR-SECURITIES> 77,742,186
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 7,972,265
<TOTAL-LIABILITIES> 85,714,451
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3,099,671,572
<SHARES-COMMON-STOCK> 10,003,414
<SHARES-COMMON-PRIOR> 11,534,768
<ACCUMULATED-NII-CURRENT> 283,872
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (110,490,450)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (181,897,121)
<NET-ASSETS> 2,807,567,873
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 194,807,411
<OTHER-INCOME> 0
<EXPENSES-NET> 29,639,991
<NET-INVESTMENT-INCOME> 165,167,420
<REALIZED-GAINS-CURRENT> (80,336,232)
<APPREC-INCREASE-CURRENT> (337,916,790)
<NET-CHANGE-FROM-OPS> (253,085,602)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 7,276,888
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,545,618
<NUMBER-OF-SHARES-REDEEMED> 4,420,358
<SHARES-REINVESTED> 343,386
<NET-CHANGE-IN-ASSETS> (1,069,512,031)
<ACCUMULATED-NII-PRIOR> (5,790,395)
<ACCUMULATED-GAINS-PRIOR> (30,157,715)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 16,481,900
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 29,639,991
<AVERAGE-NET-ASSETS> 170,059,427
<PER-SHARE-NAV-BEGIN> 15.92
<PER-SHARE-NII> 0.67
<PER-SHARE-GAIN-APPREC> (1.80)
<PER-SHARE-DIVIDEND> 0.64
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 14.15
<EXPENSE-RATIO> 1.25
</TABLE>