| Portes-les-Valence to Opwijk | 422.23 mi (679.51 km) |
| Portes-les-Valence to Ostend | 448.08 mi (721.12 km) |
| Portes-les-Valence to Oud-Heverlee | 411.91 mi (662.91 km) |
| Portes-les-Valence to Oud-Turnhout | 445.22 mi (716.52 km) |
| Portes-les-Valence to Oudenaarde | 417.15 mi (671.34 km) |
| Portes-les-Valence to Oudenburg | 444.48 mi (715.31 km) |
| Portes-les-Valence to Oupeye | 404.72 mi (651.34 km) |
| Portes-les-Valence to Overijse | 408.65 mi (657.66 km) |
| Portes-les-Valence to Overpelt | 438.99 mi (706.49 km) |
| Portes-les-Valence to Paal | 426.24 mi (685.97 km) |
| Portes-les-Valence to Peer | 433.31 mi (697.34 km) |
| Portes-les-Valence to Pepinster | 395.79 mi (636.96 km) |
| Portes-les-Valence to Peruwelz | 394.51 mi (634.91 km) |
| Portes-les-Valence to Perwez | 397.35 mi (639.48 km) |
| Portes-les-Valence to Philippeville | 368.35 mi (592.81 km) |
