US BOUNDARIES, ALL TWELVE LAYERS
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One GeoPackage with every layer (states, counties, county subdivisions, places, ZCTAs,
congressional districts, unified school districts, metro and micro areas, urban areas,
primary roads, rail lines, telephone area codes) for the 50 states and DC, and a QGIS project that opens them all.

Each layer's own download has a README listing its columns. Public domain (U.S. Census
Bureau TIGER/Line). Citation appreciated: "Boundaries: U.S. Census Bureau TIGER/Line,
via CountyGISMaps.com". CountyGISMaps is an independent data service, not affiliated
with any government agency.
