From Cockerham, Lancashire to all cities in Durham starting with letter O
- Oak Tree, Lancashire
- Oakenshaw, Lancashire
- Old Cassop, Lancashire
- Old Durham, Lancashire
- Old Eldon, Lancashire
- Old Quarrington, Lancashire
- Old Stillington, Lancashire
- Old Thornley, Lancashire
- Old Town, Lancashire
- Old Wingate, Lancashire
- Ornsby Hill, Lancashire
- Ouston, Lancashire
- Ovington, Lancashire
- Owton Manor, Lancashire
- Oxbridge, Lancashire
- Oxhill, Lancashire