Cities
United Kingdom
- Nuthall
- Nutley
- Nympsfield
- Oadby
- Oakerthorpe
- Oakham
- Oakhanger
- Oakhill
- Oakington
- Oakley
- Oakridge Lynch
- Oaksey
- Oare
- Oban
- Ockley
- Odcombe
- Oddington
- Odiham
- Offham
- Ogmore Vale
- Ogmore-by-Sea
- Ogwell
- Okeford Fitzpaine
- Okehampton
- Old Basing
- Old Buckenham
- Old Colwyn
- Old Kilpatrick
- Old Malton
- Old Plean
- Old Trafford
- Old Windsor
- Oldbrook
- Oldbury
- Oldbury-on-Severn
- Oldham District
- Oldham
- Oldland Common
- Oldmeldrum
- Ollerton
- Olney
- Omagh
- Onich
- Orford
- Orkney
- Orkney
- Ormiston
- Ormskirk
- Orpington
- Orrell
- Orsett
- Orwell
- Osea Island
- Osmington Mills
- Osmington
- Osmotherley
- Ossett
- Osterley
- Oswaldtwistle
- Oswestry