Q: I know what town my ancestor lived in but I don't know which county that town is in. A: This one is easy.  I can offer you two sites to check: http://resources.rootsweb.com/cgi-bin/townco.cgi http://geonames.usgs.gov/pls/gnis/web_query.gnis_web_query_form You might also have a look at the Communities page at this site.  While it certainly has a long way to go, your village, town or city may one day be highlighted - giving you this third route.