- Oake
- Oakhill
- Oakle Street
- Oaksey
- Oare
- Odcombe
- Odstock
- Offwell
- Ogbourne Saint Andrew
- Ogbourne Saint George
- Okehampton
- Old Sarum
- Oldbury-on-Severn
- Oldbury on the Hill
- Oldways End
- Olveston
- Orcheston
- Osmington
- Othery
- Otterford
- Otterham
- Otterhampton
- Otterton
- Ottery Saint Mary
- Outer Hope
- Over Compton
- Overcombe
- Owermoigne
- Oxenwood
- Oakford
