| Somain to Octeville | 224.40 mi (361.14 km) |
| Somain to Oignies | 14.80 mi (23.81 km) |
| Somain to Oissel | 120.13 mi (193.33 km) |
| Somain to Olivet | 183.23 mi (294.89 km) |
| Somain to Ollioules | 513.23 mi (825.96 km) |
| Somain to Olonne-sur-Mer | 351.04 mi (564.95 km) |
| Somain to Oloron-Sainte-Marie | 527.82 mi (849.44 km) |
| Somain to Onet Village | 415.24 mi (668.27 km) |
| Somain to Onnaing | 14.16 mi (22.79 km) |
| Somain to Orange | 435.62 mi (701.07 km) |
| Somain to Orchies | 8.25 mi (13.28 km) |
| Somain to Orleans | 180.59 mi (290.63 km) |
| Somain to Orly | 118.37 mi (190.50 km) |
| Somain to Ormesson-sur-Marne | 113.57 mi (182.77 km) |
| Somain to Orsay | 124.69 mi (200.66 km) |
