| Clayton to Octeville | 287.18 mi (462.17 km) |
| Clayton to Oignies | 306.41 mi (493.12 km) |
| Clayton to Oissel | 331.11 mi (532.88 km) |
| Clayton to Olivet | 439.71 mi (707.65 km) |
| Clayton to Ollioules | 813.69 mi (1,309.51 km) |
| Clayton to Olonne-sur-Mer | 500.65 mi (805.71 km) |
| Clayton to Oloron-Sainte-Marie | 733.60 mi (1,180.62 km) |
| Clayton to Onet Village | 680.17 mi (1,094.62 km) |
| Clayton to Onnaing | 328.13 mi (528.08 km) |
| Clayton to Orange | 730.16 mi (1,175.08 km) |
| Clayton to Orchies | 313.28 mi (504.18 km) |
| Clayton to Orleans | 437.34 mi (703.84 km) |
| Clayton to Orly | 392.58 mi (631.79 km) |
| Clayton to Ormesson-sur-Marne | 392.93 mi (632.36 km) |
| Clayton to Orsay | 391.43 mi (629.95 km) |
