| Clay Cross to Octeville | 244.57 mi (393.60 km) |
| Clay Cross to Oignies | 264.64 mi (425.89 km) |
| Clay Cross to Oissel | 285.36 mi (459.24 km) |
| Clay Cross to Olivet | 393.95 mi (634.00 km) |
| Clay Cross to Ollioules | 768.28 mi (1,236.43 km) |
| Clay Cross to Olonne-sur-Mer | 458.20 mi (737.40 km) |
| Clay Cross to Oloron-Sainte-Marie | 689.81 mi (1,110.15 km) |
| Clay Cross to Onet Village | 634.42 mi (1,021.01 km) |
| Clay Cross to Onnaing | 287.41 mi (462.54 km) |
| Clay Cross to Orange | 684.61 mi (1,101.77 km) |
| Clay Cross to Orchies | 272.07 mi (437.86 km) |
| Clay Cross to Orleans | 391.59 mi (630.20 km) |
| Clay Cross to Orly | 347.29 mi (558.91 km) |
| Clay Cross to Ormesson-sur-Marne | 347.79 mi (559.71 km) |
| Clay Cross to Orsay | 345.98 mi (556.81 km) |
