What is the code schema that you use for countries? March 28, 2022 12:36 Updated The schema that we use for countries is ISO_3166-1. You can find more information about it in the following resources: http://data.okfn.org/data/core/country-list https://en.wikipedia.org/wiki/ISO_3166-1. Related articles What is the -sky location schema and why not just use IATA? Which services can I access and what are the rate limits?