| Middelkerke to Oignies | 50.02 mi (80.50 km) |
| Middelkerke to Oissel | 148.43 mi (238.88 km) |
| Middelkerke to Olivet | 233.11 mi (375.15 km) |
| Middelkerke to Ollioules | 573.65 mi (923.21 km) |
| Middelkerke to Olonne-sur-Mer | 382.88 mi (616.19 km) |
| Middelkerke to Oloron-Sainte-Marie | 574.88 mi (925.18 km) |
| Middelkerke to Onet Village | 471.27 mi (758.44 km) |
| Middelkerke to Onnaing | 64.72 mi (104.16 km) |
| Middelkerke to Orange | 495.54 mi (797.50 km) |
| Middelkerke to Orchies | 52.45 mi (84.40 km) |
| Middelkerke to Orleans | 230.42 mi (370.82 km) |
| Middelkerke to Orly | 169.70 mi (273.11 km) |
| Middelkerke to Ormesson-sur-Marne | 166.22 mi (267.50 km) |
| Middelkerke to Orsay | 174.09 mi (280.17 km) |
| Middelkerke to Orthez | 557.54 mi (897.28 km) |
