Reino Unido
Países del mundo
O
- (Shropshire) Osbaston
- (Cumbria) Oxenholm
- (Greater London) Old Oak Common
- (Dorset) Osprey Quay, Portland
- (Liverpool) Old Swan
- (East Sussex) Offham
- (Cambridgeshire) Offord D’Arcy
- (Hampshire) Oakley
- (Warwickshire) Oldbury
- (Suffolk) Oulton
- (West Sussex) Oving
- (Essex) Ovington
- (Hampshire) Ower
- (Lincolnshire) Owmby-by-Spital
- (Essex) Ongar
- (Orkney Islands) Orkney Islands
- (Eilean Siar) Outer Hebrides
- (Shetland Islands) Outer Flaess
- (Greater London) Oliver's Island
- (Highland) Oigh Sgeir
- (Highland) Oldany Island
- (Eilean Siar) Old Hill
- (Shetland Islands) Orfasay
- (Shetland Islands) Ormal
- (Highland) Ornsay
- (Shetland Islands) Oxna Island
- (Argyll and Bute) Oronsay
- (Highland) Oronsay
- (Highland) Oronsay
- (Eilean Siar) Oronsay