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

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000775370
[CIK] Smith Barney Muni Funds, Inc.
<SERIES>
   <NUMBER>001
<NAME> SB Muni Funds National Portfolio

<S>                             <C>
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                               Mar-30-2001
<PERIOD-END>                                    Sep-30-2000
<INVESTMENTS-AT-COST>                           419,166,411
<INVESTMENTS-AT-VALUE>                          428,134,520
<RECEIVABLES>                                    10,371,586
<ASSETS-OTHER>                                       83,104
<OTHER-ITEMS-ASSETS>                                      0
<TOTAL-ASSETS>                                  438,589,210
<PAYABLE-FOR-SECURITIES>                         10,048,658
<SENIOR-LONG-TERM-DEBT>                                   0
<OTHER-ITEMS-LIABILITIES>                         2,253,709
<TOTAL-LIABILITIES>                              12,302,367
<SENIOR-EQUITY>                                           0
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<SHARES-COMMON-STOCK>                            27,979,702
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<ACCUMULATED-NII-CURRENT>                           335,347
<OVERDISTRIBUTION-NII>                                    0
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<OTHER-INCOME>                                            0
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<REALIZED-GAINS-CURRENT>                         (1,117,858)
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<NET-CHANGE-FROM-OPS>                            15,205,048
<EQUALIZATION>                                            0
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<DISTRIBUTIONS-OF-GAINS>                                  0
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<EXPENSE-RATIO>                                        0.68



</TABLE>