About this site

This site presents data on UK postcodes and geographical areas, based on open data released by the Office for National Statistics and Ordnance Survey.

It is intended to help the process of enhancing existing data sets, for example by allowing someone to lookup which local authority a postcode is in.

We are currently working on a new version of this site, which will be released soon. The new version will be faster, more accurate, and will include more data. It will also include a paid version of the API, with guaranteed uptime and a higher rate limit.

If you have any questions, please contact us at [email protected]

Data sources

Postcode data: NSPL
Area data: Code History Database and Register of Geographic Codes
Boundary data: ONS Geoportal
Placenames: Index of Place Names in Great Britain
MSOA names: House of Commons Library (Open Parliament Licence)

Postcode data from ONS used under Open Government License
Contains OS data © Crown copyright and database right 2023
Contains Royal Mail data © Royal Mail copyright and database right 2023
Contains National Statistics data © Crown copyright and database right 2023

Northern Ireland postcodes are included based on the Northern Ireland End User Licence. The licence covers internal use of the data. Commercial use may require additional permission.

Use the API

The API provides programmatic access to the postcode data, using the JSON api specification.

The .json at the end of the url is optional, requests will return json by default unless .html is added.

ONS GSS codes are used for area IDs.

Example requests

Get data on a postcode	`/postcodes/AB12+3CD.json`	Example	Example HTML
Get data about a postcode nearest to a latitude, longitude point	`/points/51.501009,-0.141588.json`	Example	Example HTML
Get data about an area Includes 5 random postcodes from the area	`/areas/E01000001.json`	Example	Example HTML
Get an area's boundaries as geojson NB not available for all areas	`/areas/E01000001.geojson`	Example
Get data about a place Includes 5 random postcodes from the area	`/places/IPN0000001.json`	Example	Example HTML
Search for areas containing a string	`/search/?q=search+term`		Example HTML
Get information about a type of area (local authority, parliamentary constituency, etc)	`/areatypes/pcon.json`	Example	Example HTML
Get information about all types of area	`/areatypes/`		HTML

Privacy

To get critical information about the behavior of our visitors, we use Simple Analytics. This analytics software gives us insight about our visitors only in general, but not about individuals, as it does not track visitors and does not store any personal identifiable information.

Go to their documentation to find out what Simple Analytics collects (and most importantly what they don't).