| Saint-Martin-Boulogne to Opwijk | 112.53 mi (181.09 km) |
| Saint-Martin-Boulogne to Ostend | 65.80 mi (105.89 km) |
| Saint-Martin-Boulogne to Oud-Heverlee | 132.77 mi (213.67 km) |
| Saint-Martin-Boulogne to Oud-Turnhout | 151.24 mi (243.40 km) |
| Saint-Martin-Boulogne to Oudenaarde | 86.38 mi (139.01 km) |
| Saint-Martin-Boulogne to Oudenburg | 67.40 mi (108.47 km) |
| Saint-Martin-Boulogne to Oupeye | 175.45 mi (282.35 km) |
| Saint-Martin-Boulogne to Overijse | 126.87 mi (204.17 km) |
| Saint-Martin-Boulogne to Overpelt | 168.10 mi (270.52 km) |
| Saint-Martin-Boulogne to Paal | 155.84 mi (250.80 km) |
| Saint-Martin-Boulogne to Peer | 168.75 mi (271.58 km) |
| Saint-Martin-Boulogne to Pepinster | 183.64 mi (295.54 km) |
| Saint-Martin-Boulogne to Peruwelz | 86.74 mi (139.59 km) |
| Saint-Martin-Boulogne to Perwez | 139.53 mi (224.55 km) |
| Saint-Martin-Boulogne to Philippeville | 133.37 mi (214.63 km) |
