- Old Edlington
- Okeford Fitzpaine
- Osprey Quay, Portland
- Old Ellerby
- Offham
- Old Harlow
- Ongar
- Ostend
- Ovington
- Oakridge Lynch
- Oldcroft
- Over
- Old Oak Common
- Oliver's Island
- Osterley
- Oakhanger
- Oakley
- Old Alresford
- Old Basing
- Old Netley
- Ower
- Orcop Hill
- Oaklands
- Old Hall Green
- Old Knebworth
- Old Grimsby
- Old Town
- Old Wives Lees
- Oldbury
- Oakenshaw