Outline of US counties

Data from shapefiles provided by the Census Bureau’s MAF/TIGER geographic database at https://www.census.gov/geo/maps-data/data/cbf/cbf_state.html. County outlines are based on the 1:20m resolution level. Divisions and regions are based on TIGER/Line Shapefiles for states and equivalents in the 2016 release.

counties

counties_inset

Format

both objects are data frames consisting of variables of length ~50k:

  • long: geographic longitude

  • lat: geographic latitude

  • order: order of locations

  • hole: logical vector

  • piece: positive integer value, one for each separate area/island of a county

  • id: integer value uniquely identifying each county

  • group: character value - composite of id and piece, uniquely identifying each part of each county

  • STATEFP: FIPS state code

  • COUNTYFP: FIPS county code

  • COUNTYNS: GNIS county code

  • AFFGEOID: American FactFinder county code

  • GEOID: GEOID county code

  • NAME: name of county

  • ALAND: land area of the county in square meters

  • AWATER: water area of the county in square meters

  • STATE: name of the state

  • STUSPS: US state code

  • REGION: integer of US region

  • DIVISION: integer of US division

Examples

# NOT RUN {
library(ggplot2)
library(magrittr)
counties %>% ggplot(aes(x = long, y = lat)) +
  geom_path(aes(group = group))

counties_inset %>% ggplot(aes(x = long, y = lat)) +
  geom_path(aes(group = group))
# }