| Castellarano to Opwijk | 537.57 mi (865.13 km) |
| Castellarano to Ostend | 586.17 mi (943.34 km) |
| Castellarano to Oud-Heverlee | 517.64 mi (833.07 km) |
| Castellarano to Oud-Turnhout | 537.73 mi (865.39 km) |
| Castellarano to Oudenaarde | 547.19 mi (880.61 km) |
| Castellarano to Oudenburg | 581.66 mi (936.09 km) |
| Castellarano to Oupeye | 486.89 mi (783.57 km) |
| Castellarano to Overijse | 518.28 mi (834.08 km) |
| Castellarano to Overpelt | 522.09 mi (840.23 km) |
| Castellarano to Paal | 517.13 mi (832.24 km) |
| Castellarano to Peer | 516.29 mi (830.88 km) |
| Castellarano to Pepinster | 474.58 mi (763.76 km) |
| Castellarano to Peruwelz | 530.32 mi (853.46 km) |
| Castellarano to Perwez | 502.12 mi (808.09 km) |
| Castellarano to Philippeville | 485.98 mi (782.10 km) |
