| Halen to Oignies | 98.51 mi (158.54 km) |
| Halen to Oissel | 209.83 mi (337.69 km) |
| Halen to Olivet | 257.41 mi (414.26 km) |
| Halen to Ollioules | 540.62 mi (870.05 km) |
| Halen to Olonne-sur-Mer | 437.14 mi (703.52 km) |
| Halen to Oloron-Sainte-Marie | 599.15 mi (964.23 km) |
| Halen to Onet Village | 469.62 mi (755.78 km) |
| Halen to Onnaing | 76.86 mi (123.70 km) |
| Halen to Orange | 470.72 mi (757.56 km) |
| Halen to Orchies | 88.12 mi (141.81 km) |
| Halen to Orleans | 254.96 mi (410.32 km) |
| Halen to Orly | 194.64 mi (313.25 km) |
| Halen to Ormesson-sur-Marne | 188.34 mi (303.11 km) |
| Halen to Orsay | 202.92 mi (326.57 km) |
| Halen to Orthez | 584.32 mi (940.37 km) |
