| Riom to Octeville | 339.46 mi (546.30 km) |
| Riom to Oignies | 316.19 mi (508.86 km) |
| Riom to Oissel | 256.15 mi (412.23 km) |
| Riom to Olivet | 147.67 mi (237.66 km) |
| Riom to Ollioules | 233.12 mi (375.17 km) |
| Riom to Olonne-sur-Mer | 237.70 mi (382.55 km) |
| Riom to Oloron-Sainte-Marie | 261.34 mi (420.59 km) |
| Riom to Onet Village | 108.56 mi (174.71 km) |
| Riom to Onnaing | 311.32 mi (501.03 km) |
| Riom to Orange | 146.89 mi (236.40 km) |
| Riom to Orchies | 316.58 mi (509.49 km) |
| Riom to Orleans | 149.98 mi (241.36 km) |
| Riom to Orly | 199.80 mi (321.54 km) |
| Riom to Ormesson-sur-Marne | 201.63 mi (324.49 km) |
| Riom to Orsay | 198.56 mi (319.55 km) |
