From Morfa, Gwynedd to all cities in Norfolk starting with letter O
- Oby, Gwynedd
- Old Beetley, Gwynedd
- Old Brigg, Gwynedd
- Old Buckenham, Gwynedd
- Old Catton, Gwynedd
- Old Hall Street, Gwynedd
- Old Hunstanton, Gwynedd
- Old Lakenham, Gwynedd
- Orange Row, Gwynedd
- Ormesby St Margaret, Gwynedd
- Ormesby St Michael, Gwynedd
- Oulton, Gwynedd
- Oulton Street, Gwynedd
- Outwell, Gwynedd
- Overstrand, Gwynedd
- Ovington, Gwynedd
- Oxborough, Gwynedd
- Oxnead, Gwynedd
- Oxwick, Gwynedd