A portion of the Census Bureau. Focuses on population, geographic, and economic information. You can input an area as small as a zip code and get a breakdown of statistics
A tool for investigating U.S. demographic trends, brought to you by the Social Science Data Analysis Network (SSDAN) at the University of Michigan; for graphical views of census data
Statistics collected by over 100 separate U.S. government agencies are gathered together. Subjects are searchable by keywords or by a list of topics. Mapstats allows searches for statistics from U.S. states, counties, and cities