WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
Morgan Stanley Dean Witter Municipal Income Trust (IQI)
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> OCT-31-2000
<INVESTMENTS-AT-COST> 644,844,269
<INVESTMENTS-AT-VALUE> 675,833,908
<RECEIVABLES> 11,545,221
<ASSETS-OTHER> 326,421
<OTHER-ITEMS-ASSETS> 10,475,104
<TOTAL-ASSETS> 698,180,654
<PAYABLE-FOR-SECURITIES> (21,405,133)
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (900,852)
<TOTAL-LIABILITIES> (22,305,985)
<SENIOR-EQUITY> 208,000,000
<PAID-IN-CAPITAL-COMMON> 430,512,889
<SHARES-COMMON-STOCK> 30,738,920
<SHARES-COMMON-PRIOR> 32,730,413
<ACCUMULATED-NII-CURRENT> 2,529,092
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 3,843,049
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 30,989,639
<NET-ASSETS> 675,874,669
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 40,488,840
<OTHER-INCOME> 0
<EXPENSES-NET> (3,503,995)
<NET-INVESTMENT-INCOME> 36,984,845
<REALIZED-GAINS-CURRENT> 4,965,229
<APPREC-INCREASE-CURRENT> 2,723,226
<NET-CHANGE-FROM-OPS> 44,673,300
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (37,387,606)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (1,991,493)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (19,304,423)
<ACCUMULATED-NII-PRIOR> 2,931,853
<ACCUMULATED-GAINS-PRIOR> (1,122,180)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (2,384,156)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (3,535,729)
,<AVERAGE-NET-ASSETS> 469,465,170
<PER-SHARE-NAV-BEGIN> 14.88
<PER-SHARE-NII> 1.17
<PER-SHARE-GAIN-APPREC> 0.36
<PER-SHARE-DIVIDEND> (1.19)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.22
<EXPENSE-RATIO> 0.75
</TABLE>