Dataset - data.gov.uk

Local Authority District to Country (April 2020) Lookup in the UK

This is a lookup file between local authority districts and countries in the UK as at 1st April 2020. (File Size - 64 KB)Field Names - LAD20CD, LAD20NM, CTRY20CD, CTRY20NM,...
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You can also access this registry using the API (see API Docs).