S - U
This site provides digital coverages of U.S. Census demographics to GIS users. Atlas GIS and MapInfo formats are supported. The data are provided freely for research and instructional use only. GIS files are stored in Atlas GIS export (.bna) format and can be downloaded. The data can be browsed by state. Information provided by http://plue.sedac.ciesin.org/plue/ddcarto/
SEDAC/DDCARTO