This is an excellent gateway to economic and population census data. Data are available for download, in customizable tables or in thematic mapped. The site provides access data from the Decennial Censuses, the Economic Censuses, and the American Community Survey.
More than 70 agencies in the United States Federal Government produce statistics of interest to the public. The Federal Interagency Council on Statistical Policy maintains this site to provide easy access to the full range of statistics and information produced by these agencies for public use. (http://fedstats.sites.usa.gov)
This is the U.S. government's official portal to federal and state information online. It offers a subject directory as well as a search engine that will search federal, state, or a particular state' s web sites.