The Decennial Census occurs every 10 years, in years ending in zero, to count the population and housing units for the entire United States. Its primary purpose is to provide the population counts that determine how seats in the U.S. House of Representatives are apportioned.
Data about families and living arrangements are available for the U.S., 50 states and the District of Columbia, counties, and subcounty statistical areas (such as zip codes and block groups) from 1790 to the present.
Census 2010
2010 census information on families and living arrangements is available at the national, state and sub-state levels. Use American FactFinder to find available Census 2010 data on families and living arrangements.
Census 2000
2000 census information on families and living arrangements is available at the national, state and sub-state levels. Use American FactFinder to find available Census 2000 data on families and living arrangements.
For more information about the Census 2000 survey and other data collected from the survey, visit the Census 2000 gateway.
Fact Sheet: Differences in the Marital Status Estimates from the American Community Survey, Current Population Survey, Survey of Income and Program Participation, and Decennial Census.
Fact Sheet: Differences in the Households and Family Estimates from the American Community Survey, Current Population Survey, Survey of Income and Program Participation, and Decennial Census Participation, and Decennial Census.
Data from previous censuses can be found on the Census of Population and Housing page. Historical Census reports are also available in PDF for 1790-1990.