Reference values in the United Kingdom
Reference numbers can be useful for linking to third-party datasets, in order to aid comparisons and help with assessing completion within OSM. The tables below list the reference numbers and keys in common use in the United Kingdom.
| Objects | OSM Key | Ref/ID Name | Data Custodian | External Dataset | Licence | Notes | 
|---|---|---|---|---|---|---|
| Food Outlets | fhrs:id=* | FHRS Number | Food Standards Agency / Local Authorities (D) | FHRS Open Data | OGLv3 | |
| Highways | ref=* highway_ref=* highway_authority_ref=* | Highway Number | Highway Authorities (C) | List of Streets | various | |
| Listed Buildings | HE_ref=* | Listing Number | Historic England | National Heritage List for England | OGLv3 | |
| Listed Buildings (Wales) | ref:cadw=* | Listing Number | Cadw | |||
| Post Boxes | ref=* | Post box number | Royal Mail | CMD Postbox List (out of date) | None | |
| Post Offices | ref:pol_id=* | Post Office ID | Post Office Ltd. | Post Office Branch List | OGLv3 | |
| Properties | ref:GB:uprn=* | Unique Property Reference Number (UPRN) | GeoPlace / Local Authorities (D) | OS Open UPRN | OGLv3 | |
| Public Monuments and Sculpture | PMSA_ref=* | PMSA National Recording Project database id | UK's Public Monument and Sculpture Association | |||
| Public Rights of Way | prow_ref=* | Right of Way Number | Surveying Authorities (C) | PRoW GIS Data | various | |
| Public Transport Stations / Stops | naptan:AtcoCode=* | ATCO Code | Department for Transport / Local Authorities (C) | NaPTAN | OGLv3 | |
| Renewable energy projects | repd:id=* | Renewable Energy Planning Database (REPD) ID | Department for Business, Energy & Industrial Strategy | Renewable Energy Planning Database | OGLv3 (source) | |
| Schools (England & Wales) | ref:edubase=* | Udubase URN | Department for Education | Udubase / Get Information About Schools | OGLv3 | |
| Schools (Scotland) | ref:seedcode=* | SEED Code | Education Scotland | |||
| Schools (Northern Ireland) | ref:deniirn=* | DENI IRN | Department of Education (NI) | |||
| Streets | ref:GB:usrn=* | Unique Street Reference Number (USRN) | GeoPlace / Local Authorities (D) | OS Open USRN | OGLv3 | 
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