Dataset - data.gov.uk

Ward to LAD to County to County Electoral Division (May 2020) Lookup for EN

A lookup of wards to local authority districts to county to county electoral divisions in England as at 7th May 2020. (File Size - 2 MB).Field Names – WD20CD, WD20NM, LAD20CD,...
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You can also access this registry using the API (see API Docs).