cfreema wrote:i also found this website here that has extremely good info. i use it all the time and it goes by incorporated cities/towns and zipcodes and unincorporated towns and is useful at getting borders because it provides an overlay over google maps which isn't perfect but is darned close. look at cheverly, maryland and the 20785 zip code and you will see where cheverly is in the zipcode and where hyattsville surrounds cheverly in the same zip, cheverly being an incorporated town that does not occupy the entire zip code. the maps are about midway down the page on the left. it also gives detailed populace info for the nerds in us all.
http://www.city-data.com/
p.s. this is for reference only and should not be integrated as a basemap due to licensing issues. i just use it to look at a line and manually edit the map.
Re: Official Sources of Mapping Information