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Last updated: 3 Aug 2021

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 https://mapit.mysociety.org/postcode/E18QS 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 ons.geography@ons.gov.uk and ask them to correct the data for the next postcode release.