[ARTICLE] 6
[CIK] 0000886043
[NAME] MANAGED MUNICIPAL PORTFOLIO INC.
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   6-MOS
[FISCAL-YEAR-END]                          MAY-31-1998
[PERIOD-END]                               NOV-30-1997
[INVESTMENTS-AT-COST]                      442,586,414
[INVESTMENTS-AT-VALUE]                     448,831,006
[RECEIVABLES]                               19,260,487
[ASSETS-OTHER]                                  21,703
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                             468,113,196
[PAYABLE-FOR-SECURITIES]                    36,627,120
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                    1,241,933
[TOTAL-LIABILITIES]                         37,869,053
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                   413,082,820
[SHARES-COMMON-STOCK]                       34,564,281
[SHARES-COMMON-PRIOR]                       34,552,414
[ACCUMULATED-NII-CURRENT]                    1,199,369
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                     12,172,350
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                     6,188,342
[NET-ASSETS]                               430,244,143
[DIVIDEND-INCOME]                                    0
[INTEREST-INCOME]                           11,381,076
[OTHER-INCOME]                                       0
[EXPENSES-NET]                               2,088,436
[NET-INVESTMENT-INCOME]                      9,292,640
[REALIZED-GAINS-CURRENT]                     8,483,008
[APPREC-INCREASE-CURRENT]                   13,067,244
[NET-CHANGE-FROM-OPS]                       30,842,892
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                   12,027,658
[DISTRIBUTIONS-OF-GAINS]                             0
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                              0
[NUMBER-OF-SHARES-REDEEMED]                          0
[SHARES-REINVESTED]                             11,867
[NET-CHANGE-IN-ASSETS]                      18,958,350
[ACCUMULATED-NII-PRIOR]                      1,535,649
[ACCUMULATED-GAINS-PRIOR]                    3,689,342
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                        1,893,090
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                              2,088,436
[AVERAGE-NET-ASSETS]                       424,342,947
[PER-SHARE-NAV-BEGIN]                            11.90
[PER-SHARE-NII]                                  00.27
[PER-SHARE-GAIN-APPREC]                          00.63
[PER-SHARE-DIVIDEND]                             00.35
[PER-SHARE-DISTRIBUTIONS]                            0
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              12.45
[EXPENSE-RATIO]                                  00.98
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>