| Middelharnis to Octeville | 293.59 mi (472.48 km) |
| Middelharnis to Oignies | 102.15 mi (164.40 km) |
| Middelharnis to Oissel | 214.33 mi (344.93 km) |
| Middelharnis to Olivet | 286.90 mi (461.72 km) |
| Middelharnis to Ollioules | 600.03 mi (965.65 km) |
| Middelharnis to Olonne-sur-Mer | 449.04 mi (722.67 km) |
| Middelharnis to Oloron-Sainte-Marie | 631.50 mi (1,016.29 km) |
| Middelharnis to Onet Village | 515.35 mi (829.37 km) |
| Middelharnis to Onnaing | 97.34 mi (156.65 km) |
| Middelharnis to Orange | 526.74 mi (847.71 km) |
| Middelharnis to Orchies | 96.83 mi (155.84 km) |
| Middelharnis to Orleans | 284.26 mi (457.48 km) |
| Middelharnis to Orly | 222.03 mi (357.33 km) |
| Middelharnis to Ormesson-sur-Marne | 217.10 mi (349.39 km) |
| Middelharnis to Orsay | 228.33 mi (367.46 km) |
