Socio-demographic data on the U.S. population
 

• American Community Survey (annual data releases starting with 2005)
   
• Current Population Survey (annual survey for state and national reporting).
   
• Decennial Census of Population and Housing (look for "Sample Data" through 2000)
  

  2010 replaced  by ACS

  2000

  1990

  1980

  1970

  1960 and earlier

Population Counts only (limited demographic detail)
 

• Decennial Census of Population and Housing (look for "100% Data")

  2010	2000	1990	1980	1970	1960 and earlier

• Population Estimates (population counts for inter-censual years)
   
• Population Projections