Free UK postcode lookup API and datasets. Search, validate and reverse geocode postcodes. Open sourced project.
Build a postcode finder, a location-aware signup form, or a mapping/geocoding tool for UK addresses. You can validate postcodes, autocomplete partial searches, reverse-geocode coordinates, and fetch associated administrative and demographic data. The API is free to use and open-source, so you can try it without signup. For heavy or commercial workloads you can self-host or opt for the commercial Ideal Postcodes service for higher SLAs.
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