This file is a best fit lookup between output areas (December 2021), electoral wards/divisions and local authority districts in England and Wales as at 4th May 2023. (File Size - 11 MB)Field Names - OA21CD, WD23CD, WD23NM, WD23NMW, LAD23CD, LAD23NM, LAD23NMWField Types - Text, Text, Text, Text, Text, Text, TextField Lengths - 9, 9, 53, 45, 9, 35, 24 This file published on 16th March 2023 is updated on 12th December 2025 to correct ward allocation of OA21 E00107679 being reassigned to Ward (WD23) (E05011642) instead of E05011648. The erroneous allocation was due to boundary refinement work conducted by Ordnance Survey. This is an update product! Please check your version and download the updated product. See details on our dedicated notices page. For further questions or specific requirements, please contact the ONS Geography mailbox ONS.Geography@ons.gov.uk