United Kingdom and Ireland
British Antarctic Survey
British Geological Survey
Gazetteer for Scotland
Highways Agency
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