| Grez-Doiceau to Oignies | 77.02 mi (123.96 km) |
| Grez-Doiceau to Oissel | 186.75 mi (300.55 km) |
| Grez-Doiceau to Olivet | 234.94 mi (378.10 km) |
| Grez-Doiceau to Ollioules | 527.45 mi (848.85 km) |
| Grez-Doiceau to Olonne-sur-Mer | 413.77 mi (665.90 km) |
| Grez-Doiceau to Oloron-Sainte-Marie | 577.52 mi (929.43 km) |
| Grez-Doiceau to Onet Village | 450.75 mi (725.41 km) |
| Grez-Doiceau to Onnaing | 53.93 mi (86.80 km) |
| Grez-Doiceau to Orange | 455.70 mi (733.38 km) |
| Grez-Doiceau to Orchies | 66.29 mi (106.69 km) |
| Grez-Doiceau to Orleans | 232.46 mi (374.11 km) |
| Grez-Doiceau to Orly | 171.76 mi (276.42 km) |
| Grez-Doiceau to Ormesson-sur-Marne | 165.56 mi (266.44 km) |
| Grez-Doiceau to Orsay | 179.90 mi (289.52 km) |
| Grez-Doiceau to Orthez | 562.45 mi (905.18 km) |
