| Castellabate to Opwijk | 901.38 mi (1,450.63 km) |
| Castellabate to Ostend | 950.65 mi (1,529.92 km) |
| Castellabate to Oud-Heverlee | 881.02 mi (1,417.87 km) |
| Castellabate to Oud-Turnhout | 899.43 mi (1,447.49 km) |
| Castellabate to Oudenaarde | 911.60 mi (1,467.08 km) |
| Castellabate to Oudenburg | 946.13 mi (1,522.65 km) |
| Castellabate to Oupeye | 848.55 mi (1,365.62 km) |
| Castellabate to Overijse | 881.93 mi (1,419.33 km) |
| Castellabate to Overpelt | 882.95 mi (1,420.97 km) |
| Castellabate to Paal | 879.09 mi (1,414.76 km) |
| Castellabate to Peer | 877.28 mi (1,411.84 km) |
| Castellabate to Pepinster | 836.17 mi (1,345.69 km) |
| Castellabate to Peruwelz | 894.88 mi (1,440.17 km) |
| Castellabate to Perwez | 865.65 mi (1,393.13 km) |
| Castellabate to Philippeville | 850.34 mi (1,368.50 km) |
