country.map
A world map
country.regions
Names of all regions on the country.map data.frame. A data.frame that includes both English names and their iso2c equivalents.
county.map
Map of the counties of each of the 50 US states plus the district of columbia.
county.regions
A data.frame consisting of the name of each region in the map county.map as well as their FIPS codes and state names.
state.map
Map of the 50 US states plus the district of columbia.
state.regions
A data.frame consisting of each region on the map state.map plus their postal code abbreviations and FIPS codes.