/usr/share/basemap/data/UScounties.prj is in python-mpltoolkits.basemap-data 1.0.7+dfsg-3build2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 | GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
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