SimplyAnalytics provides data for all geographies include census block-groups, census tracts, ZIP codes, cities, counties, states, and the entire United States. (this is for power users only, not for beginning researchers)
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Please make an appointment with BIS team for information about how this database works.
The ultimate place to find comprehensive and detailed demographic information on the United States. Now includes Census 2010 data. Pay attention to the browsable index "Subjects A to Z" and the categories on the home page. American FactFinder offers detailed demographic information on state, county, and city levels.