How to use UK Postcode Lookup
This UK postcode lookup resolves any British postcode to its administrative geography and exact map coordinates in a single query. Enter a postcode such as SW1A 1AA and you instantly see the country, region, local authority district, county, electoral ward, parish, and the latitude and longitude of the postcode centroid. It draws on Postcodes.io, an open API built directly on Office for National Statistics and Ordnance Survey open data, so the answers match official UK government datasets without any sign-up, key, or cost.
- Type the UK postcode you want to look up into the search box (spacing is optional).
- Press Look up (or hit Enter) to query the Postcodes.io API.
- Read the resolved country, region, administrative district, county, ward and parish.
- Note the latitude and longitude centroid if you need map coordinates.
- Try another postcode, or copy the coordinates into your mapping tool.
Your query is sent to Postcodes.ioto fetch results. We don't store it.
Anatomy of a UK postcode
A UK postcode is split into two halves separated by a space. The outward code (e.g. SW1A) identifies the postal area and district and is used to route mail to the correct sorting office. The inward code (e.g. 1AA) narrows delivery down to a group of roughly fifteen addresses. The first one or two letters are the postal area (SW = South West London), followed by a district number, then the sector digit and two final letters. Because the format is standardised, a lookup can map any valid postcode to a rich set of administrative boundaries and a precise grid reference.
| Component | Example | Meaning |
|---|---|---|
| Postal area | SW | Group of districts (South West London) |
| District | SW1A | Outward code routing to a sorting office |
| Sector | SW1A 1 | A neighbourhood within the district |
| Unit | SW1A 1AA | A small group of nearby addresses |
What the administrative fields mean
Each postcode is mapped to several layers of UK administrative geography. The country is one of England, Scotland, Wales or Northern Ireland. The region is a former Government Office Region (only meaningful in England). The administrative district is the local council responsible for services like bins and planning, while the county is the upper-tier authority where two-tier local government still exists. The electoral ward is the smallest unit used for council elections, and the parish (where one exists) is the most local tier of government. The coordinates are the centroid of the postcode unit, so they sit roughly in the middle of its addresses rather than on a specific door.
Glossary
- Outward code
- The first half of a postcode (e.g. SW1A) that routes mail to a postal district.
- Inward code
- The second half of a postcode (e.g. 1AA) that identifies a small group of addresses.
- Administrative district
- The local authority (council) responsible for an area, such as Westminster.
- Parish
- The most local tier of government in England and Wales; not every postcode has one.
- Centroid
- The central point of a postcode unit, returned as latitude and longitude.
Related reading
Frequently Asked Questions
Why use UK Postcode Lookup?
- Resolve a postcode to its country, region, district, county, ward and parish in one query
- Get precise latitude/longitude centroid coordinates for mapping, routing and geocoding
- Built on official ONS and Ordnance Survey open data, so geography matches government records
- No sign-up, key or cost, and recent lookups are cached so repeat searches are instant
Common use cases
- Auto-fill or validate the city, county and region on an address or checkout form
- Geocode a customer postcode to latitude/longitude for delivery routing or mapping
- Confirm which local authority or council an address falls under for tax or services
- Check which electoral ward or parish a postcode belongs to for canvassing or research
- Verify that a postcode a user typed is real and well-formed before saving it
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