Release of latest data from the Office of National Statistics
TL:DR We rolled out the May 2025 ONS Postcode Directory (ONSPD) update to postcodes.io. Every postcode lookup returns the latest administrative and census geography codes.
What is the ONS Postcode Directory?
The ONSPD links every current and terminated unit postcode in Great Britain and Northern Ireland to an extensive range of administrative, electoral, health and census geographies. It uses the Government Statistical Service’s 9-character codes, making it easy to join postcode data to statutory area names. The directory supports:
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Local authority districts, wards, parishes and communities
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Census Output Areas (OA), Lower/Upper Layer Super Output Areas (LSOA/MSOA) and Data Zones (DZ)
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Health boards, NHS regions and clinical commissioning groups
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Parliamentary constituencies, regions and other official statistical areas
Quarterly Release Cycle
We sync postcodes.io with each ONSPD release in February, May, August and November. We've rolled out the update with the May 2025 ONS Postcode Directory dataset and the next one is in August 2025
Find information on their data here.