United Kingdom & Ireland
- British Antarctic Survey
- British Geological Survey
- Gazetteer for Scotland
- National Highways
- Isle of Man Survey
- The National Gazetteer of Wales
- Ordnance Survey
- Ordnance Survey Ireland
- Ordnance Survey of Northern Ireland
- The Permanent Committee on Geographical Names for British Official Use
- Placenames Database of Ireland
- Royal Geographical Society
- Scottish Placename Society
- UK Hydrographic Office
- Ulster Placename Society