Choroplethr

Choroplethr makes it easy to create color-coded (choropleth) maps in R. No knowledge of cartography or shapefiles needed; go directly from your geographically identified data to a highly customizable map with a single line of code! Supported geographies: U.S. states, counties, and census tracts, world countries and sub-country regions (e.g., provinces, prefectures, etc.).