Reino Unido
Países do mundo
O
- (Eilean Siar) Orosay
- (Eilean Siar) Orosay
- (Eilean Siar) Orosay
- (Argyll and Bute) Orsay Island
- (Orkney Islands) Outer Holm
- (Shetland Islands) Outer Holm of Skaw
- Onchan
- (Derby) Osmaston
- (East Lothian) Oldhamstocks
- (Wiltshire) Odstock
- Ogbourne Saint George
- (Central Bedfordshire) Old Warden
- (City and County of Swansea) Oxwich
- (Neath Port Talbot) Onllwyn
- (Lincolnshire) Old Somerby
- (Nottinghamshire) Ossington
- (Kent) Oare
- (Leicestershire) Owston
- (Highland) Overscaig
- (Highland) Oldshoremore
- (Highland) Obinan
- (Surrey) Ockham
- (Devon) Oakford
- (Mid Ulster) Oritor
- (Aberdeenshire) Oyne
- (The Scottish Borders) Oxton
- (The Scottish Borders) Oxnam