From the US Census Bureau. This is the site to visit for 2000 Census data. It provides both reference maps which show basic boundary information (cities, counties, census tracts, etc.) as well as thematic maps. The thematic map option allows a user to select the geographic area of coverage, select from a limited number of themes and then view the results.
Based at Queens College of the City University of New York provides access to interactive data maps back to 1940. Users can access data on population, age, sex, education, marital status, employment and much more on a national level or zoom in to state, city or street level. Maps can be printed or downloaded into a slideshow.
From the US Census Bureau is one of the original interactive mapping sites on the Web. Users can map a limited number of census variables to geographic map areas such as U.S. Congressional Districts, zip code areas and more standard census and blockgroup areas. Cultural features such as highways and parks are also available for mapping. Search by city or provide a specific set of coordinates. Major updates are not planned for this site, but it remains a useful resource.