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IPUMS USA 1850 to 2004 (Integrated Public Use Microdata Series from the University of Minnesota).
ICPSR (Inter-University Consortium for Political and Social Research
United States Census Data, 2000 at ICPSR
Census of Population and Housing, 1790-1950 [United States] Series
Census of Population and Housing, 1990 [United States]: Extract Data
Census of Population and Housing, 1980 [United States]: Extract Data
Census of Population and Housing, 1970 [United States]: Extract Data
Census of Population, 1950 [United States]: Public Use Microdata Sample
Census of Population, 1940 [United States]: Public Use Microdata Sample
Census of Population, 1910 [United States]: Public Use Microdata Sample
United State Census Data, 1900: Public Use Sample
Need help? Call the Government Publications, Maps, Microforms & Newspapers help desk at (206) 543-4164 during desk hours. You can also consult the Ask Us! reference service (24/7)