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OS Names API

With OS Names API, you’ll have access to a straightforward, rapid lookup service: drilling down into the details we hold in our OS Open Names dataset.


2.5 million identifiable places in Great Britain

The API uses the OS Open Names dataset, a gazetteer or directory hosting detailed information about 2.5 million identifiable places in Great Britain including postcodes, roads and settlements.

Easy integration

Integrating easily with your own GIS or web and mobile based apps, the ‘find my nearest’ resource in OS Names API can make the results within customer facing applications more efficient.

Adding value

No need to download, store and manage large and complex datasets, we take care of that so you can focus on adding value.

Detailed, searchable data

Detailed, searchable data

OS Names API gives you smooth access to brilliantly detailed, searchable data – The details of nearly 44,000 individual settlements over 870,000 named and numbered roads and 1.7 million postcodes all matched/mapped to the National Grid.

You may be hunting for statistical data, analysing trends, or using details for purely consumer-oriented service. It also supports the discovery or identification and visualisation of a named place, geocoding, routing and navigation.

Functionality of the API

Functionality of the API

The service offers two resources. The ‘find’ tool is a string-based lookup service, and the ‘nearest’ tool uses a pair of British National Grid (BNG) coordinates to return the nearest feature.

Easy to integrate

Easy to integrate

OS Names API is a RESTful web service, which makes it easy to integrate with your own apps and existing GIS.

How to get this product

  • OS OpenData APIs (unlimited access).
  • Free for creating apps, products and services for 3rd parties including the public.
  • Free for internal business use.
  • See the OS Data Hub Plans page for more information.

Technical specification

Key FeaturesWhat this product offers
Data StructureJSON and XML
Update FrequencyQuarterly - January, April, July & October
ProjectionBritish National Grid (EPSG: 27700)
Availability99.9% uptime
SupplyAccess via the OS Data Hub
CoverageGreat Britain