The UK Postcode Finder uses the free postcodes.io open data API to look up information about any valid UK postcode. Data includes the postcode's administrative area, ward, parliamentary constituency, county, country, and precise GPS coordinates.

What Information Does a Postcode Return?

Administrative district: The local authority responsible for the area (e.g. City of Westminster)
Ward: The electoral ward within the district
County: The county (where applicable, e.g. Greater Manchester)
Country: England, Scotland, Wales, or Northern Ireland
Latitude & Longitude: GPS coordinates for the postcode centroid
Region: The NUTS level 1 region (e.g. London, South West)
Constituency: The UK Parliament constituency

UK Postcode Format

UK postcodes follow a structured format: outward code (1-2 letters + 1-2 digits, e.g. SW1A) + space + inward code (1 digit + 2 letters, e.g. 1AA). Together: SW1A 1AA. They identify areas down to a street or part of a street.

Frequently Asked Questions

What is postcodes.io?

Postcodes.io is a free, open-source UK postcode API. It uses data from Ordnance Survey, National Statistics, and other government sources under the Open Government Licence. No API key is required for basic lookups.

Does it work for partial postcodes?

You can enter a full postcode for precise results. The autocomplete feature will suggest valid postcodes as you type based on a partial outward code.

What are "nearby postcodes"?

The tool shows the nearest postcodes to the one you looked up, using the postcodes.io nearest endpoint. This can be useful for finding neighbouring areas or expanding a search radius.

UK Postcode Finder online