From Fornham St Genevieve, Suffolk to all cities in Greater Manchester starting with letter O
- Oak Bank, Suffolk
- Oaken Bottom, Suffolk
- Offerton, Suffolk
- Offerton Green, Suffolk
- Old Birtle, Suffolk
- Old Tame, Suffolk
- Old Trafford, Suffolk
- Oldfield Brow, Suffolk
- Oldham, Suffolk
- Oldham Edge, Suffolk
- Oozewood, Suffolk
- Openshaw, Suffolk
- Ordsall, Suffolk
- Orrell, Suffolk
- Orrell Post, Suffolk
- Outwood, Suffolk
- Outwood Gate, Suffolk
- Over Hulton, Suffolk
- Owler Barrow, Suffolk