| Mons to Oignies | 42.09 mi (67.74 km) |
| Mons to Oissel | 148.48 mi (238.95 km) |
| Mons to Olivet | 201.23 mi (323.85 km) |
| Mons to Ollioules | 512.97 mi (825.55 km) |
| Mons to Olonne-sur-Mer | 376.34 mi (605.66 km) |
| Mons to Oloron-Sainte-Marie | 545.39 mi (877.73 km) |
| Mons to Onet Village | 425.13 mi (684.18 km) |
| Mons to Onnaing | 16.08 mi (25.87 km) |
| Mons to Orange | 437.94 mi (704.80 km) |
| Mons to Orchies | 31.09 mi (50.04 km) |
| Mons to Orleans | 198.68 mi (319.74 km) |
| Mons to Orly | 136.96 mi (220.41 km) |
| Mons to Ormesson-sur-Marne | 131.20 mi (211.15 km) |
| Mons to Orsay | 144.52 mi (232.58 km) |
| Mons to Orthez | 529.75 mi (852.55 km) |
