| Castellanza to Opwijk | 428.34 mi (689.35 km) |
| Castellanza to Ostend | 474.42 mi (763.50 km) |
| Castellanza to Oud-Heverlee | 409.57 mi (659.14 km) |
| Castellanza to Oud-Turnhout | 432.63 mi (696.24 km) |
| Castellanza to Oudenaarde | 435.91 mi (701.54 km) |
| Castellanza to Oudenburg | 469.96 mi (756.33 km) |
| Castellanza to Oupeye | 382.38 mi (615.38 km) |
| Castellanza to Overijse | 409.55 mi (659.11 km) |
| Castellanza to Overpelt | 418.48 mi (673.47 km) |
| Castellanza to Paal | 411.79 mi (662.72 km) |
| Castellanza to Peer | 412.53 mi (663.90 km) |
| Castellanza to Pepinster | 370.35 mi (596.02 km) |
| Castellanza to Peruwelz | 417.96 mi (672.63 km) |
| Castellanza to Perwez | 393.81 mi (633.78 km) |
| Castellanza to Philippeville | 375.18 mi (603.80 km) |
