.east_north_central     East North Central census division
.east_south_central     East South Central census division
.mid_atlantic           Mid-Atlantic census division
.midwest_region         Midwest census region
.mountain               Mountain census division
.new_england            New England census division
.north_central_region   North-Central census region
.northeast_region       Northeast census region
.pacific                Pacific census division
.south_atlantic         South Atlantic census division
.south_region           South census region
.west_north_central     West North Central census division
.west_region            West census region
.west_south_central     West South Central census division
countypop               Population estimates (2015), county level
countypov               Poverty percentage estimates (2014), county
                        level
fips                    Retrieve FIPS code for either a US state or
                        county
fips_info               Retrieve states or counties using FIPS codes
map_with_data           Join county or state level data to US map data
plot_usmap              Conveniently plot basic US map
statepop                Population estimates (2015), state level
statepov                Poverty percentage estimates (2014), state
                        level
us_map                  Retrieve US map data
usmap                   usmap: US maps including Alaska and Hawaii
