# Data sources

Location data: [GeoNames](https://www.geonames.org/), [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), downloaded 2026-09-23.

Sources: [countries](https://download.geonames.org/export/dump/countryInfo.txt), [cities](https://download.geonames.org/export/dump/cities15000.zip), [regions](https://download.geonames.org/export/dump/admin1CodesASCII.txt). Adapted by removing obsolete codes, simplifying names and fields, grouping by country and sorting by population. Supplied as is, without warranties of accuracy or completeness.

Calling codes: [Google libphonenumber metadata](https://github.com/google/libphonenumber/blob/master/resources/PhoneNumberMetadata.xml), copyright The Libphonenumber Authors, [Apache License 2.0](./libphonenumber-LICENSE.txt). Adapted to retain territory IDs and calling codes.