<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW INSURED MUNICIPAL INCOME TRUST
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> OCT-31-2000
<INVESTMENTS-AT-COST> 526,711,485
<INVESTMENTS-AT-VALUE> 534,740,126
<RECEIVABLES> 13,051,102
<ASSETS-OTHER> 370,644
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 548,161,872
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (649,116)
<TOTAL-LIABILITIES> (649,116)
<SENIOR-EQUITY> 155,000,000
<PAID-IN-CAPITAL-COMMON> 392,059,812
<SHARES-COMMON-STOCK> 27,191,713
<SHARES-COMMON-PRIOR> 28,064,113
<ACCUMULATED-NII-CURRENT> 1,387,035
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (8,962,732)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8,028,641
<NET-ASSETS> 547,512,756
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 30,814,958
<OTHER-INCOME> 0
<EXPENSES-NET> (2,795,794)
<NET-INVESTMENT-INCOME> 28,019,164
<REALIZED-GAINS-CURRENT> 954,002
<APPREC-INCREASE-CURRENT> 20,377,877
<NET-CHANGE-FROM-OPS> 49,351,043
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (29,928,017)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (872,400)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 8,235,702
<ACCUMULATED-NII-PRIOR> 3,295,888
<ACCUMULATED-GAINS-PRIOR> (9,916,734)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (1,895,026)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (2,810,634)
<AVERAGE-NET-ASSETS> 383,477,418
<PER-SHARE-NAV-BEGIN> 13.69
<PER-SHARE-NII> 1.01
<PER-SHARE-GAIN-APPREC> 0.82
<PER-SHARE-DIVIDEND> (1.08)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 14.44
<EXPENSE-RATIO> 0.73
</TABLE>
