🆕geometryallocationmethodvalue

This page details upcoming data that will be provided for the new Geometry Allocation Method Value Code List in the OS NGD from the end of September 2025 to give you early insight. This code list is currently not available through the live access services. The information on this page is as accurate as possible, but is subject to change before launch.

This code list is used in association with the Geometry Allocation Method attribute which is present within the Royal Mail Address Feature Type. The code list describes the method by which a geometry was allocated to the Royal Mail record. Where a Royal Mail record is matched to a Local Authority record, the geometry will be assigned from the matched record. Where a Royal Mail record cannot be directly matched, geometry will be assigned by reference to a parent record, a street, or records which share the postcode unit, sector, district or area – in the listed order of preference. Where none of the listed methods are available, the geometry will be allocated to an internal centre point for the Local Authority area or Island in which the Royal Mail address is located.

Label	Definition
Local Authority	Royal Mail Address geometry is derived from the mean position of the Local Authority District.
Matched UPRN	When a Royal Mail Unique Delivery Point Reference Number (UDPRN) is matched to a single Unique Property Reference Number (UPRN), the geometry associated to the UPRN is inherited onto the Royal Mail Address feature.
Postcode District	Royal Mail Address geometry is derived from the mean position of all matched Unique Property Reference Numbers (UPRNs) that share the same Postcode District. NOTE: Postcode Sector precedes Postcode Unit and is represented by one number. It is used in conjunction with Postcode Unit to sort mail for local delivery offices.
Postcode Sector	Royal Mail Address geometry is derived from the mean position of all matched Unique Property Reference Numbers (UPRNs) that share the same Postcode Sector. NOTE: Postcode Sector precedes Postcode Unit and is represented by one number. It is used in conjunction with Postcode Unit to sort mail for local delivery offices.
Postcode Unit	Royal Mail Address geometry is derived from the mean position of all matched Unique Property Reference Numbers (UPRNs) that share the same Postcode Unit. NOTE: Postcode Unit represents the last two letters of a Postcode, which identifies one or more Small User Delivery Points or an individual Large User.