| Castel Volturno to Opwijk | 827.69 mi (1,332.04 km) |
| Castel Volturno to Ostend | 876.35 mi (1,410.35 km) |
| Castel Volturno to Oud-Heverlee | 807.59 mi (1,299.69 km) |
| Castel Volturno to Oud-Turnhout | 826.76 mi (1,330.55 km) |
| Castel Volturno to Oudenaarde | 837.41 mi (1,347.67 km) |
| Castel Volturno to Oudenburg | 871.85 mi (1,403.10 km) |
| Castel Volturno to Oupeye | 775.88 mi (1,248.65 km) |
| Castel Volturno to Overijse | 808.34 mi (1,300.90 km) |
| Castel Volturno to Overpelt | 810.60 mi (1,304.53 km) |
| Castel Volturno to Paal | 806.31 mi (1,297.63 km) |
| Castel Volturno to Peer | 804.87 mi (1,295.32 km) |
| Castel Volturno to Pepinster | 763.51 mi (1,228.76 km) |
| Castel Volturno to Peruwelz | 820.39 mi (1,320.29 km) |
| Castel Volturno to Perwez | 792.13 mi (1,274.81 km) |
| Castel Volturno to Philippeville | 776.21 mi (1,249.18 km) |
