State & County QuickFacts provides "Quick, easy access to facts about people, business, and geography".
USA Counties features over 6,300 data items for the United States, States and counties from a variety of sources. Files include data published for 2010 population as well as many other items from the 2010 Census of Population and Housing, the 1990 census, the 1980 census and the 2007, 2002, 1997, and 1992 economic censuses.
Both from the US Census.
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