| Grez-Doiceau to Ostend | 84.60 mi (136.15 km) |
| Grez-Doiceau to Oud-Heverlee | 7.06 mi (11.36 km) |
| Grez-Doiceau to Oud-Turnhout | 42.15 mi (67.83 km) |
| Grez-Doiceau to Oudenaarde | 48.72 mi (78.40 km) |
| Grez-Doiceau to Oudenburg | 80.25 mi (129.15 km) |
| Grez-Doiceau to Oupeye | 41.29 mi (66.45 km) |
| Grez-Doiceau to Overijse | 8.06 mi (12.98 km) |
| Grez-Doiceau to Overpelt | 45.69 mi (73.53 km) |
| Grez-Doiceau to Paal | 29.52 mi (47.51 km) |
| Grez-Doiceau to Peer | 42.88 mi (69.01 km) |
| Grez-Doiceau to Pepinster | 50.26 mi (80.88 km) |
| Grez-Doiceau to Peruwelz | 51.18 mi (82.37 km) |
| Grez-Doiceau to Perwez | 9.07 mi (14.60 km) |
| Grez-Doiceau to Philippeville | 37.43 mi (60.24 km) |
| Grez-Doiceau to Plombieres | 54.66 mi (87.97 km) |
