SVG map of state subdivisions. Subdivisions are identified by their FIPS code. See the original map for more information: File:Usa counties large.svg. Generated with python script from the federal map - script available on request.
Map of subdivisions of US state. Based on File:Usa counties large.svg , which itself is a derivative work by Abe.suleiman of a PD work.
US Census Bureau, Abe.suleiman and Lodewijk Gelauff