<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW CALIFORNIA 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> 232,887,918
<INVESTMENTS-AT-VALUE> 231,081,582
<RECEIVABLES> 4,244,368
<ASSETS-OTHER> 169,198
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 235,495,148
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (336,389)
<TOTAL-LIABILITIES> (336,389)
<SENIOR-EQUITY> 65,000,000
<PAID-IN-CAPITAL-COMMON> 175,992,742
<SHARES-COMMON-STOCK> 12,449,413
<SHARES-COMMON-PRIOR> 12,691,513
<ACCUMULATED-NII-CURRENT> 1,283,414
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (5,311,061)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1,806,336)
<NET-ASSETS> 235,158,759
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6,559,786
<OTHER-INCOME> 0
<EXPENSES-NET> (666,206)
<NET-INVESTMENT-INCOME> 5,893,580
<REALIZED-GAINS-CURRENT> (11,643)
<APPREC-INCREASE-CURRENT> 1,863,959
<NET-CHANGE-FROM-OPS> 7,745,896
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6,076)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 0
<NUMBER-OF-SHARES-REDEEMED> (242,100)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (1,306,562)
<ACCUMULATED-NII-PRIOR> 1,465,910
<ACCUMULATED-GAINS-PRIOR> (5,299,418)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (411,925)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (672,873)
<AVERAGE-NET-ASSETS> 170,385,847
<PER-SHARE-NAV-BEGIN> 13.51
<PER-SHARE-NII> 0.47
<PER-SHARE-GAIN-APPREC> 0.15
<PER-SHARE-DIVIDEND> (0.46)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 13.67
<EXPENSE-RATIO> 0.79
</TABLE>
