WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<RESTATED>
<CIK> 0001057942
<NAME> NUVEEN TAX-FREE UNIT TRUST
<SERIES> Series 1012
<NAME> OHIO INSURED TRUST
<NUMBER> 151
<MULTIPLIER> 1
<CURRENCY> U.S. DOLLARS
<FISCAL-YEAR-END> JUN-30-2000
<PERIOD-START> JUL-01-1999
<PERIOD-END> JUN-30-2000
<PERIOD-TYPE> YEAR
<EXCHANGE-RATE> 1
<INVESTMENTS-AT-COST> 1,655,959
<INVESTMENTS-AT-VALUE> 1,511,311
<RECEIVABLES> 16,107
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,528,914
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 7,761
<TOTAL-LIABILITIES> 7,761
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 0
<SHARES-COMMON-STOCK> 17,379
<SHARES-COMMON-PRIOR> 17,489
<ACCUMULATED-NII-CURRENT> 11,243
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> -1,169
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> -144,648
<NET-ASSETS> 1,521,153
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 83,889
<OTHER-INCOME> 0
<EXPENSES-NET> 3,855
<NET-INVESTMENT-INCOME> 80,034
<REALIZED-GAINS-CURRENT> -1,169
<APPREC-INCREASE-CURRENT> -90,008
<NET-CHANGE-FROM-OPS> -11,143
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 80,050
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 17,500
<NUMBER-OF-SHARES-REDEEMED> 121
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> -100,457
<ACCUMULATED-NII-PRIOR> 11,259
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 0
<PER-SHARE-NII> 0
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 0
<EXPENSE-RATIO> 0
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
