I'm currently reading the John Adams biography by David McCullough which is really good. It seems like history has overlooked Adams a little, giving more glory to Jefferson and Washington.
Anyways, as they mentioned where the different people were from I became curious about the distribution of birth places of Presidents. So here's the visual, a Google Earth set of the birth places mapped. I didn't plot them to be very precise, such as the exact coordinates, just the rough city or area.
US_Presidents.kml (right-click Save As...)
A little data:
You will need: Google Earth to view map.
Data From:
PresidentsUSA.net
AmericanPresidents.org [C-SPAN]