Fast and accurate UK postcode lookup service with comprehensive address data, coordinates, and validation.
The Postcode Lookup API provides fast and accurate UK address data. Start by creating an API token, then choose your dataset and begin looking up postcodes to get comprehensive address information.
All API requests should be made to:
https://api.findableplus.comSelect royal-mail (official, comprehensive)
Use valid UK postcode format (e.g., "SW1A 1AA", "W1A 1AA", etc.). The API will return all addresses matching the postcode with detailed address components and optional coordinate data.
Send a GET request to /postcode/lookup/v1/{dataset} with your postcode parameter and optional coordinate data request.
Receive structured address data including formatted lines, coordinates, and detailed components like building, street, town, and county information.
Add the data parameter to include latitude/longitude (onspd_coordinates) and/or grid reference (onspd_gridreference) data. You can request both together using data=onspd_coordinates,onspd_gridreference or individually using data=onspd_coordinates or data=onspd_gridreference.
For detailed implementation examples, request parameters, and response formats, see the interactive API reference below.