Where can I find the latitude and longitude coordinates to draw counties?

I am trying to draw counties on a google map for a mashup. I'd like to find a database of latitude and longitude coordinates to make this easier.Where can I find the latitude and longitude coordinates to draw counties?
Atlas or map or google earth :)Where can I find the latitude and longitude coordinates to draw counties?
on a mapWhere can I find the latitude and longitude coordinates to draw counties?
Google Earth