| Boulogne-Billancourt to Opwijk | 170.75 mi (274.80 km) |
| Boulogne-Billancourt to Ostend | 167.90 mi (270.20 km) |
| Boulogne-Billancourt to Oud-Heverlee | 175.33 mi (282.16 km) |
| Boulogne-Billancourt to Oud-Turnhout | 210.17 mi (338.23 km) |
| Boulogne-Billancourt to Oudenaarde | 151.80 mi (244.30 km) |
| Boulogne-Billancourt to Oudenburg | 165.70 mi (266.67 km) |
| Boulogne-Billancourt to Oupeye | 199.46 mi (320.99 km) |
| Boulogne-Billancourt to Overijse | 168.99 mi (271.97 km) |
| Boulogne-Billancourt to Overpelt | 216.63 mi (348.64 km) |
| Boulogne-Billancourt to Paal | 200.44 mi (322.58 km) |
| Boulogne-Billancourt to Peer | 213.44 mi (343.50 km) |
| Boulogne-Billancourt to Pepinster | 199.58 mi (321.19 km) |
| Boulogne-Billancourt to Peruwelz | 130.76 mi (210.44 km) |
| Boulogne-Billancourt to Perwez | 168.78 mi (271.63 km) |
| Boulogne-Billancourt to Philippeville | 140.06 mi (225.41 km) |
