Cartogram

Cartogram - The normal space of a map is distorted to display collected data about a geographical area.

http://www.longwood.edu/staff/hardinds/Politics/Smoke-free_Virginia/SmokeFree2009.htm
http://www.longwood.edu/staff/hardinds/Politics/Smoke-free_Virginia/Majority%20Non-Smoking%202009%20cartogram_jpg.jpg
The above is a cartogram of smoke free restaurants by county in Virginia.