The Census Tracts within the 7-county Chicago Metropolitan Agency for Planning (CMAP) region. From the US Census Bureau's TIGER/Line shapefiles, 2023 vintage.
tract_sfFormat
tract_sf is a multipolygon sf object with 2070 rows and
4 variables:
- geoid_tract
Unique 11-digit tract ID, assigned by the Census Bureau. Character.
- county_fips
Unique 5-digit FIPS code of the county the tract is in. Character.
- sqmi
Area in square miles. Double.
- geometry
Feature geometry.
sfmultipolygon.
Source
US Census Bureau TIGER/Line
Details
Census Bureau description:
*"Census Tracts are small, relatively permanent statistical subdivisions of a county or statistically equivalent entity that can be updated by local participants prior to each decennial census as part of the Census Bureau’s Participant Statistical Areas Program (PSAP). The Census Bureau delineates census tracts in situations where no local participant responded or where state, local, or tribal governments declined to participate. The primary purpose of census tracts is to provide a stable set of geographic units for the presentation of statistical data.
*"Census tracts generally have a population size between 1,200 and 8,000 people, with an optimum size of 4,000 people. A census tract usually covers a contiguous area; however, the spatial size of census tracts varies widely depending on the density of settlement. Census tract boundaries are delineated with the intention of being maintained over a long time so that statistical comparisons can be made from census to census. Census tracts occasionally are split due to population growth or merged as a result of substantial population decline.
"Census tract boundaries generally follow visible and identifiable features. They may follow nonvisible legal boundaries, such as minor civil division (MCD) or incorporated place boundaries in some states and situations, to allow for census tract-to-governmental unit relationships where the governmental boundaries tend to remain unchanged between censuses. State and county boundaries always are census tract boundaries in the standard census geographic hierarchy. Tribal census tracts are a unique geographic entity defined within federally recognized American Indian reservations and off-reservation trust lands and can cross state and county boundaries. The tribal census tracts may be completely different from the standard county-based census tracts defined for the same area."
Examples
# Display the tracts with ggplot2
library(ggplot2)
ggplot(tract_sf) + geom_sf(lwd = 0.1) + theme_void()
