| Zemst to Oignies | 71.50 mi (115.07 km) |
| Zemst to Oissel | 185.52 mi (298.56 km) |
| Zemst to Olivet | 242.80 mi (390.75 km) |
| Zemst to Ollioules | 545.30 mi (877.58 km) |
| Zemst to Olonne-sur-Mer | 416.34 mi (670.04 km) |
| Zemst to Oloron-Sainte-Marie | 586.84 mi (944.43 km) |
| Zemst to Onet Village | 464.29 mi (747.21 km) |
| Zemst to Onnaing | 54.15 mi (87.14 km) |
| Zemst to Orange | 472.52 mi (760.45 km) |
| Zemst to Orchies | 61.94 mi (99.68 km) |
| Zemst to Orleans | 240.25 mi (386.64 km) |
| Zemst to Orly | 178.52 mi (287.30 km) |
| Zemst to Ormesson-sur-Marne | 172.78 mi (278.06 km) |
| Zemst to Orsay | 186.01 mi (299.35 km) |
| Zemst to Orthez | 571.27 mi (919.38 km) |
