There are about a million ways to make a choropleth map. You know, the maps that color regions by some metric. The problem is that a lot of solutions require expensive software or have a high learning curve...or both. What if you just want a simple map without all the GIS stuff? In this post, I'll show you how to make a county-specific choropleth map using only free tools.

See original: How to Make a US County Thematic Map Using Free Tools | FlowingData