Cartographic boundaries (1:500,000) for all U.S. counties and county
equivalents, as a national sf object. Geometries are simplified for a
compact package size. Use as a base layer for mapping the county-level
estimates (homeless) and with the Census-to-CoC crosswalk.
Format
An sf data frame (CRS EPSG:4269, NAD83) with one row per
county and 9 attributes plus geometry:
- fips
5-digit county FIPS code.
- STATEFP
2-digit state FIPS code.
- COUNTYFP
3-digit county FIPS code.
- NAME
County name.
- NAMELSAD
County name with legal/statistical description.
- STUSPS
Two-letter state abbreviation.
- STATE_NAME
State name.
- ALAND
Land area in square meters.
- AWATER
Water area in square meters.
- geometry
County boundary polygon.
Source
U.S. Census Bureau TIGER/Line cartographic boundary files, via the tigris package (https://www.census.gov/geographies/mapping-files.html).
Details
This object defines the canonical county FIPS vintage for the whole
package: area, homeless, homeless_na,
sp_homeless, county_pit, county_pit_detail and the
county_coc* / tract_coc* crosswalks are all keyed on it.
County codes change over time – Connecticut replaced its eight counties
(09001-09015) with nine planning regions (09110-09190), Alaska split
Valdez-Cordova into Chugach (02063) and Copper River (02066) and renamed
Wade Hampton to Kusilvak (02158), and South Dakota renamed Shannon to Oglala
Lakota (46102) – so joining data built on different vintages returns nothing
for the affected counties. The frame is pinned to the 2024 TIGER/Line vintage.