I have developed a little bit of program using a library from The University of Manchester GPC library and some "maps" in Google form (KML). The maps have outlines of every county in the US (almost 3100). The library lets me combine outlines (polygons) into one outline. I have "manually" done one state. I am adding to the software to make it easier to select counties to include in each map. When I am done, I will post the software and map files.
My main purpose is to develop a map of presbytery votes on keeping the “fidelity/chastity” ordination requirement in the Book of Order. I also plan on using the google geocoding interface, to pinpoint all of the PCUSA churches as pins on the map.