| West Carson to Octeville | 5,491.10 mi (8,837.07 km) |
| West Carson to Oignies | 5,603.45 mi (9,017.89 km) |
| West Carson to Oissel | 5,595.59 mi (9,005.23 km) |
| West Carson to Olivet | 5,692.47 mi (9,161.14 km) |
| West Carson to Ollioules | 6,058.43 mi (9,750.09 km) |
| West Carson to Olonne-sur-Mer | 5,627.02 mi (9,055.81 km) |
| West Carson to Oloron-Sainte-Marie | 5,823.49 mi (9,372.01 km) |
| West Carson to Onet Village | 5,884.13 mi (9,469.60 km) |
| West Carson to Onnaing | 5,626.43 mi (9,054.86 km) |
| West Carson to Orange | 5,972.73 mi (9,612.17 km) |
| West Carson to Orchies | 5,611.10 mi (9,030.19 km) |
| West Carson to Orleans | 5,690.91 mi (9,158.63 km) |
| West Carson to Orly | 5,666.81 mi (9,119.85 km) |
| West Carson to Ormesson-sur-Marne | 5,669.58 mi (9,124.31 km) |
| West Carson to Orsay | 5,662.24 mi (9,112.49 km) |
