| Romilly-sur-Seine to Octeville | 254.83 mi (410.11 km) |
| Romilly-sur-Seine to Oignies | 138.92 mi (223.57 km) |
| Romilly-sur-Seine to Oissel | 132.54 mi (213.30 km) |
| Romilly-sur-Seine to Olivet | 95.41 mi (153.55 km) |
| Romilly-sur-Seine to Ollioules | 385.20 mi (619.92 km) |
| Romilly-sur-Seine to Olonne-sur-Mer | 290.67 mi (467.78 km) |
| Romilly-sur-Seine to Oloron-Sainte-Marie | 422.54 mi (680.01 km) |
| Romilly-sur-Seine to Onet Village | 291.77 mi (469.56 km) |
| Romilly-sur-Seine to Onnaing | 129.47 mi (208.36 km) |
| Romilly-sur-Seine to Orange | 306.83 mi (493.79 km) |
| Romilly-sur-Seine to Orchies | 137.07 mi (220.59 km) |
| Romilly-sur-Seine to Orleans | 93.81 mi (150.97 km) |
| Romilly-sur-Seine to Orly | 62.92 mi (101.26 km) |
| Romilly-sur-Seine to Ormesson-sur-Marne | 57.36 mi (92.32 km) |
| Romilly-sur-Seine to Orsay | 71.44 mi (114.97 km) |
