[http://ftp2.census.gov/geo/maps/general_ref/us_base/stco2003/stco2003.pdf United States Census Bureau State and County Map]. This map will allow you to zoom in on any state or county in the United States and read the names of all of the neighboring counties.
The Wyoming State Archives has an on-line state [http://wyoarchives.state.wy.us/Archives/Maps.aspx Historic Map Collection]. The Historic Map Case Collection includes more than 12,000 over-sized maps, plans, certificates, posters, newspapers, etc of subjects ranging from Wyoming to the United States as a whole.
=== Web Sites ===