OS Names API won’t return a specific address in detail, or perform bulk searches. If you need more than 250,000 calls a month, please let us know.


Realising that names aren’t unique, the API will return the postcode district, populated place, district/borough, county/unitary authority, European region and country to ensure that users can refine their query to choose exactly the right place.


The API supports more than one name for places, including multilingual names (English/Welsh or English/Gaelic), for example, Cardiff (English) and Caerdydd (Welsh).