| Middle River to Opwijk | 3,808.09 mi (6,128.53 km) |
| Middle River to Ostend | 3,750.48 mi (6,035.81 km) |
| Middle River to Oud-Heverlee | 3,831.07 mi (6,165.51 km) |
| Middle River to Oud-Turnhout | 3,831.38 mi (6,166.01 km) |
| Middle River to Oudenaarde | 3,787.37 mi (6,095.18 km) |
| Middle River to Oudenburg | 3,754.78 mi (6,042.73 km) |
| Middle River to Oupeye | 3,873.82 mi (6,234.32 km) |
| Middle River to Overijse | 3,826.95 mi (6,158.89 km) |
| Middle River to Overpelt | 3,851.34 mi (6,198.14 km) |
| Middle River to Paal | 3,846.16 mi (6,189.80 km) |
| Middle River to Peer | 3,855.01 mi (6,204.04 km) |
| Middle River to Pepinster | 3,884.62 mi (6,251.69 km) |
| Middle River to Peruwelz | 3,795.08 mi (6,107.59 km) |
| Middle River to Perwez | 3,842.50 mi (6,183.91 km) |
| Middle River to Philippeville | 3,842.77 mi (6,184.35 km) |
