<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW INSURED MUNICIPAL INCOME TRUST
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> OCT-31-2000
<PERIOD-END> APR-30-2000
<INVESTMENTS-AT-COST> 533,801,163
<INVESTMENTS-AT-VALUE> 526,598,571
<RECEIVABLES> 0
<ASSETS-OTHER> 10,222,644
<OTHER-ITEMS-ASSETS> 320,762
<TOTAL-ASSETS> 537,141,977
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (837,670)
<TOTAL-LIABILITIES> (837,670)
<SENIOR-EQUITY> 155,000,000
<PAID-IN-CAPITAL-COMMON> 396,238,379
<SHARES-COMMON-STOCK> 27,513,113
<SHARES-COMMON-PRIOR> 28,064,113
<ACCUMULATED-NII-CURRENT> 2,281,695
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10,013,175)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (7,202,592)
<NET-ASSETS> 381,304,307
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 15,414,388
<OTHER-INCOME> 0
<EXPENSES-NET> (1,398,224)
<NET-INVESTMENT-INCOME> 14,016,164
<REALIZED-GAINS-CURRENT> (96,441)
<APPREC-INCREASE-CURRENT> 5,146,644
<NET-CHANGE-FROM-OPS> 19,066,367
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (15,030,357)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (551,000)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (2,972,747)
<ACCUMULATED-NII-PRIOR> 3,295,888
<ACCUMULATED-GAINS-PRIOR> (9,916,734)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (938,839)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1,407,771)
<AVERAGE-NET-ASSETS> 381,479,223
<PER-SHARE-NAV-BEGIN> 13.69
<PER-SHARE-NII> 0.51
<PER-SHARE-GAIN-APPREC> 0.20
<PER-SHARE-DIVIDEND> (0.54)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.86
<EXPENSE-RATIO> 0.74
</TABLE>
