| Merchtem to Oignies | 64.21 mi (103.33 km) |
| Merchtem to Oissel | 178.72 mi (287.62 km) |
| Merchtem to Olivet | 238.62 mi (384.02 km) |
| Merchtem to Ollioules | 546.09 mi (878.84 km) |
| Merchtem to Olonne-sur-Mer | 410.31 mi (660.33 km) |
| Merchtem to Oloron-Sainte-Marie | 583.00 mi (938.24 km) |
| Merchtem to Onet Village | 462.40 mi (744.16 km) |
| Merchtem to Onnaing | 48.72 mi (78.40 km) |
| Merchtem to Orange | 472.56 mi (760.51 km) |
| Merchtem to Orchies | 55.02 mi (88.55 km) |
| Merchtem to Orleans | 236.04 mi (379.87 km) |
| Merchtem to Orly | 174.08 mi (280.16 km) |
| Merchtem to Ormesson-sur-Marne | 168.52 mi (271.20 km) |
| Merchtem to Orsay | 181.32 mi (291.80 km) |
| Merchtem to Orthez | 567.24 mi (912.88 km) |
