This Census Bureau resource provides access to generalized, digital files suitable for use with a Geographic Information System (G.I.S.) as a base for medium to small-scale thematic mapping. Data products include Census regions, tracts, zip code tabulation areas, congressional districts, school districts, urban areas, and much more.
The cartographic boundary files on this site are available in the following formats:
ARC/INFO EXPORT (.e00) format
ArcView Shapefile (.shp) format
ARC/INFO Ungenerate (ASCII) format