Try tiger.census.gov The maps are rather good: http://tiger.census.gov/cgi-bin/mapbrowse-tbl?lat=40.08847&lon=-105.35729&wid=0.75&ht=0.75&mlat=40.08847&mlon=-105.35729&msym=redpin&off=CITIES&mlabel=Boulder+County,+CO Evelyn Mitchell efm at tummy.com