| Geraardsbergen to Oignies | 43.45 mi (69.92 km) |
| Geraardsbergen to Oissel | 157.62 mi (253.66 km) |
| Geraardsbergen to Olivet | 219.22 mi (352.81 km) |
| Geraardsbergen to Ollioules | 535.15 mi (861.25 km) |
| Geraardsbergen to Olonne-sur-Mer | 389.27 mi (626.47 km) |
| Geraardsbergen to Oloron-Sainte-Marie | 563.84 mi (907.41 km) |
| Geraardsbergen to Onet Village | 446.22 mi (718.12 km) |
| Geraardsbergen to Onnaing | 28.71 mi (46.20 km) |
| Geraardsbergen to Orange | 460.08 mi (740.43 km) |
| Geraardsbergen to Orchies | 33.94 mi (54.62 km) |
| Geraardsbergen to Orleans | 216.62 mi (348.61 km) |
| Geraardsbergen to Orly | 154.47 mi (248.59 km) |
| Geraardsbergen to Ormesson-sur-Marne | 149.14 mi (240.02 km) |
| Geraardsbergen to Orsay | 161.39 mi (259.74 km) |
| Geraardsbergen to Orthez | 547.85 mi (881.67 km) |
