| Oud-Heverlee to Oignies | 77.49 mi (124.71 km) |
| Oud-Heverlee to Oissel | 189.02 mi (304.19 km) |
| Oud-Heverlee to Olivet | 239.95 mi (386.16 km) |
| Oud-Heverlee to Ollioules | 534.48 mi (860.16 km) |
| Oud-Heverlee to Olonne-sur-Mer | 417.36 mi (671.68 km) |
| Oud-Heverlee to Oloron-Sainte-Marie | 582.98 mi (938.22 km) |
| Oud-Heverlee to Onet Village | 457.14 mi (735.70 km) |
| Oud-Heverlee to Onnaing | 56.06 mi (90.22 km) |
| Oud-Heverlee to Orange | 462.63 mi (744.53 km) |
| Oud-Heverlee to Orchies | 67.06 mi (107.92 km) |
| Oud-Heverlee to Orleans | 237.45 mi (382.14 km) |
| Oud-Heverlee to Orly | 176.42 mi (283.91 km) |
| Oud-Heverlee to Ormesson-sur-Marne | 170.33 mi (274.13 km) |
| Oud-Heverlee to Orsay | 184.39 mi (296.74 km) |
| Oud-Heverlee to Orthez | 567.79 mi (913.77 km) |
