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Last updated: 5 Apr 2022

Incorrect postcode data

We use postcode data from the ONS Postcode Directory (ONSPD) and Ordnance Survey for boundary line data. We typically import the data into Mapit every 6 months.

We sometimes receive Zendesk tickets about postcodes not returning the right results. You can check the accuracy of the postcode by:

  • Looking up the postcode on Mapit, for example and viewing the parents. There can be more than one parent which can be the case if the postcode sits between two boundaries
  • Get the latitude/longitude and look it up on Google Maps

If the data is incorrect you can contact ONS Geography and ask them to correct the data for the next postcode release.