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Government Digital Service provides a best-fit lookup table linking UK postcodes to frozen 2011 Census geographies and current local authority districts. The dataset maps postcodes to Output Areas (OA), Workplace Zones (WZ), Lower Layer Super Output Areas (LSOA), Middle Layer Super Output Areas (MSOA), and Local Authority Districts (LAD), including their 2011 classifications. It is created by plotting the mean address location of each postcode into the target geographies.
The dataset appears in multiple versions with slight schema differences (e.g., OA11CD vs OA21CD, LSOA11CD vs LSOA21CD). Users must select the version matching their required census year and reference date.