Various sites provide access to historical and current U. S. Census data and maps. They include:
How to Use American FactFinder: This site allows the user to map and retrieve data from the 1990 and 2000 US Censuses.
National Historical Geographic Information System (NHGIS): includes aggregate and statistical data and boundary files for years between 1790 and 2000.
Social Explorer: The free edition offers demographic maps from 1790-2007.
Library Administration: 631.632.7100
