| Risca to Octeville | 150.87 mi (242.81 km) |
| Risca to Oignies | 275.72 mi (443.72 km) |
| Risca to Oissel | 241.46 mi (388.60 km) |
| Risca to Olivet | 341.32 mi (549.30 km) |
| Risca to Ollioules | 718.07 mi (1,155.63 km) |
| Risca to Olonne-sur-Mer | 355.46 mi (572.06 km) |
| Risca to Oloron-Sainte-Marie | 592.74 mi (953.92 km) |
| Risca to Onet Village | 564.84 mi (909.02 km) |
| Risca to Onnaing | 302.71 mi (487.17 km) |
| Risca to Orange | 632.01 mi (1,017.12 km) |
| Risca to Orchies | 286.04 mi (460.33 km) |
| Risca to Orleans | 339.49 mi (546.36 km) |
| Risca to Orly | 312.97 mi (503.68 km) |
| Risca to Ormesson-sur-Marne | 316.10 mi (508.72 km) |
| Risca to Orsay | 308.13 mi (495.89 km) |
