The University of Missouri-St. Louis Urban Information Center has recently updated this online application, which allows users to "generate a single 1990 'Basic Tables' (demographic profile) report for any of the supported geographic units, including census tract, block group, city (no size limit), 5-digit ZIP code, state, county or metro area for anywhere in the United States. Examples are...

Maintained by UC Berkeley Digital Library Sunsite, this new data library currently contains the following information from the 1990 Census of Population and Housing: Subject Summary Tape File 1 (SSTF 1), questions asked of every household; SSTF 2: Ancestry of the Population in the United States; Summary Tape File 3, questions asked of 1 in 7 households weighted to represent the total population;...