Voronoms: an approximate set of admin area polygons for and from the GeoNames gazetteer
I just uploaded v1.0.0 of Voronoms, a set of GeoJSON shapes for admin areas1 in the GeoNames dataset, and the Python code I wrote to generate them. Voronoms differs from other datasets of admin areas in that it’s generated entirely from the location data in GeoNames. As such, its outlines won’t be entirely accurate, but they’re free and available for all countries in the same dataset. There’s more information in Voronoms’s README file.