National Historical Geographic Information System (previously Historical Census Browser) This link opens in a new windowProvides access to summary tables and time series of population, housing, agriculture, and economic data, along with GIS-compatible boundary files, for years from 1790 through the present and for all levels of U.S. census geography, including states, counties, tracts, and blocks. (Our access to this data was previously through the Historical Census Browser from the University of Virginia Library, which is no longer supporting this tool.)
Note:You must create a free username and password for access to summary tables, time series, and GIS-compatible boundary files.