| Fos-sur-Mer to Oignies | 493.27 mi (793.85 km) |
| Fos-sur-Mer to Oissel | 446.13 mi (717.98 km) |
| Fos-sur-Mer to Olivet | 338.19 mi (544.26 km) |
| Fos-sur-Mer to Ollioules | 50.37 mi (81.06 km) |
| Fos-sur-Mer to Olonne-sur-Mer | 390.98 mi (629.22 km) |
| Fos-sur-Mer to Oloron-Sainte-Marie | 279.51 mi (449.82 km) |
| Fos-sur-Mer to Onet Village | 132.83 mi (213.78 km) |
| Fos-sur-Mer to Onnaing | 483.22 mi (777.67 km) |
| Fos-sur-Mer to Orange | 47.72 mi (76.80 km) |
| Fos-sur-Mer to Orchies | 491.59 mi (791.14 km) |
| Fos-sur-Mer to Orleans | 340.39 mi (547.81 km) |
| Fos-sur-Mer to Orly | 385.30 mi (620.08 km) |
| Fos-sur-Mer to Ormesson-sur-Marne | 385.90 mi (621.05 km) |
| Fos-sur-Mer to Orsay | 385.57 mi (620.51 km) |
| Fos-sur-Mer to Orthez | 286.49 mi (461.06 km) |
