| Barreiro to Opwijk | 1,066.12 mi (1,715.75 km) |
| Barreiro to Ostend | 1,044.24 mi (1,680.53 km) |
| Barreiro to Oud-Heverlee | 1,073.75 mi (1,728.04 km) |
| Barreiro to Oud-Turnhout | 1,107.43 mi (1,782.23 km) |
| Barreiro to Oudenaarde | 1,043.20 mi (1,678.86 km) |
| Barreiro to Oudenburg | 1,044.12 mi (1,680.35 km) |
| Barreiro to Oupeye | 1,097.87 mi (1,766.86 km) |
| Barreiro to Overijse | 1,067.23 mi (1,717.55 km) |
| Barreiro to Overpelt | 1,115.47 mi (1,795.17 km) |
| Barreiro to Paal | 1,099.31 mi (1,769.17 km) |
| Barreiro to Peer | 1,112.48 mi (1,790.36 km) |
| Barreiro to Pepinster | 1,096.72 mi (1,765.00 km) |
| Barreiro to Peruwelz | 1,025.46 mi (1,650.32 km) |
| Barreiro to Perwez | 1,067.92 mi (1,718.65 km) |
| Barreiro to Philippeville | 1,038.92 mi (1,671.98 km) |
