Description Details References
The U.S. Census Bureau provides
cartographic
boundary files for current U.S. boundaries. The datasets in this package
provide a selection of boundaries from the 2020 Census files. They are
objects of class sf
from the
sf package. They are intended
to be used with the functions in the USAboundaries
package, but the
data objects can also be used on their own. The data attributes associated
with these boundaries are unchanged from what is available in the Census
boundary files, with the exception that state_name
and
state_abbreviation
columns have been added where necessary for
convience in filtering the boundaries.
The following objects are included in this package:
Congressional district boundaries for the 116th Congress, 1:500k resolution.
Congressional district boundaries for the 116th Congress, 1:20m resolution.
County boundaries, 1:500k resolution.
County boundaries, 1:20m resolution.
State boundaries, 1:500k resolution.
Centroids of Zip Code Tabulation Areas (2019).
See the USAboundaries package for low-resolution state boundaries and for the functions to access this data.
U.S. Census Bureau, Cartographic Boundary Shapefiles (2020).
See the U.S. Census Bureau's "Understanding Geographic Identifiers (GEOIDs)" and their "Geographic Codes" pages for the details of this attribute data.
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