Locations in England
- Oakley
- Oakmere
- Oaksey
- Oakworth
- Oare
- Oatlands Park
- Occold
- Ockham
- Ockley
- Ocle Pychard
- Odcombe
- Oddington
- Odell
- Odiham
- Odstock
- Offchurch
- Offenham
- Offham
- Offord Cluny
- Offord D'Arcy
- Offton
- Offwell
- Ogbourne Saint Andrew
- Ogbourne Saint George
- Okehampton
- Okeover
- Old Basing
- Old Bolingbroke
- Old Boston
- Old Brampton
- Old Buckenham
- Old Byland
- Old Clee
- Old Coulsdon
- Old Dalby
- Old Heathfield
- Old Hill
- Old Hurst
- Old Hutton
- Old Leake
- Old Malton
- Old Micklefield
- Old Milverton
- Old Newton
- Old Oak Common
- Old Penshaw
- Old Romney
- Old Sarum
- Old Somerby
- Old Street
- Old Swan
- Old Town
- Old Tupton
- Old Walker
- Old Warden
- Old Weston
- Old Windsor
- Oldbury
- Oldbury on the Hill
- Oldbury-on-Severn
- Oldham
- Oldways End
- Ollerton
- Olney
- Olton
- Olveston
- Ombersley
- Ompton
- Onecote
- Onibury
- Onneley
- Openshaw
- Orby
- Orcheston
- Ore
- Orford
- Orgreave
- Orlestone
- Orleton
- Orlingbury
- Ormesby
- Ormesby Saint Margaret
- Ormskirk
- Orpington
- Orsett
- Orston
- Orton
- Orton on the Hill
- Orton Waterville
- Orwell
- Osborne
- Osbournby
- Osmaston
- Osmington
- Osmotherley
- Osprey Quay, Portland
- Ospringe
- Ossett
- Ossington
- Osterley
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