While it overlaps data found elsewhere and is by no means comprehensive, this site offers a user-friendly format, with Help and Information files for each report. Users can select geographic regions from a map or scrollable menu list and then select a subset of data to display. The Electronic Map Library Tiger Mapping Service Digital atlases map statistical data in a visual format. The Electronic Map Library is an experimental geographic survey created by the Department of Geography at California State University, Northridge. Atlases for the United States, California, and five major cities provide graphical data on population, ancestry and nationality, income and poverty levels, and more.
Colorful maps are quick to download even on a home modem.
Tiger allows the user to manipulate data by including labels such as Congressional districts, census tracts, and zip code points, and details family and household size and income, population density, racial characteristics, and more. These periodicals manipulate demographic data for marketing purposes but usually include at least one article per issue on demographic statistics. Demographics Journal gathers articles on states and cities from American City Business Journals. It's currently free to search the archive, back to 1995, but that may change. The Latest News on Population Topics, from the University of Wisconsin-Madison Center for Demography and Ecology, provides weekly updates, linking to news and resources related to demography.