Master:
choroplethr simplifies the creation of choropleths in R. A choropleth is a thematic map where geographic regions such as states are colored according to some metric, such as which political party the state voted for. choroplethr supports three levels of geographic resolution and three types of scales. Common problems such as matching county data with map data, choosing and labeling discrete scales and creating a clean background are handled automatically.
choroplethr provides native support for viewing data from the US Census's American Community Survey (ACS).
The choroplethr package is described more fully the wiki.
To install the latest stable release type the following from an R console:
install.packages("choroplethr")
To install the development version use the devtools package:
# install.packages("devtools")
library(devtools)
install_github("choroplethr", "arilamstein")
library(choroplethr)