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OS MasterMap Address Layer

The OS MasterMap Address Layer provides precise coordinates for more than 27 million residential and commercial properties in Great Britain. It's the most accurate and up-to-date link between any property address and its location on the map.

The Address Layer originates from the Royal Mail's postcode address file (PAF®). We use on-the-ground GPS survey, aerial imagery and various other techniques to establish precise coordinates for each address and match this to the property on the map – effectively joining up postal and topographic geography, creating a fixed link between the property and its address.

Addresses are subject to a high level of change from:

  • the creation of a new property;
  • property redevelopment; and
  • house or street name changes.

This product provides a robust mechanism for users to track and manage these address changes relating to the actual property on the ground, and a continuity between a physical property (essentially unchanging) and the dynamics describing that property (changeable).

How you can use it

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For general enquiries, complaints, feedback or suggestions, email: customerservices@ordnancesurvey.co.uk or call us on 08456 05 05 05