Attribute fields include 2020 total population from the US Census PL94 data. The geometry was originally extracted from ArcUSA 1:25M in 2002 and slightly generalized for optimum performance. Geometry updates are made when major boundary changes occur such as a county splitting or merging with an adjacent unit.
This ready-to-use layer can be used within ArcGIS Pro, ArcGIS Online,
its configurable apps, dashboards, StoryMaps, custom apps, and mobile
apps. The data can also be exported for offline workflows. Cite the 'U.S. Census Bureau' when using this data.