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Office for National Statistics
Dataset Description
This file is a best fit lookup between 2011 lower layer super output areas and county and unitary authorities in England and Wales as at 1st April 2021. (File size - 5MB)
Field Names - LSOA11CD, LSOA11NM, CTYUA21CD, CTYUA21NM, FID
Field Types - Text, Text, Text, Text
Field Lengths - 9, 33, 9, 35
FID = The FID, or Feature ID is created by the publication process when the names and codes / lookup products are published to the Open Geography portal.
For more information and an overview of best-fitting follow this link -
https://geoportal.statistics.gov.uk/datasets/f0aac7ccbfd04cda9eb03e353c613faa/about
REST URL of Feature Access Service – https://services1.arcgis.com/ESMARspQHYMw9BZ9/arcgis/rest/services/LSOA11_UTLA21_EW_LU_16dd2caef0d4425b94e72dc7e4add26f/FeatureServer
Publisher name: Office for National Statistics
Last updated: 2026-03-04T16:30:40Z