| Castenaso to Opwijk | 559.51 mi (900.44 km) |
| Castenaso to Ostend | 609.45 mi (980.81 km) |
| Castenaso to Oud-Heverlee | 539.05 mi (867.51 km) |
| Castenaso to Oud-Turnhout | 557.59 mi (897.35 km) |
| Castenaso to Oudenaarde | 570.27 mi (917.76 km) |
| Castenaso to Oudenburg | 604.92 mi (973.52 km) |
| Castenaso to Oupeye | 506.70 mi (815.46 km) |
| Castenaso to Overijse | 540.02 mi (869.07 km) |
| Castenaso to Overpelt | 541.33 mi (871.19 km) |
| Castenaso to Paal | 537.19 mi (864.52 km) |
| Castenaso to Peer | 535.62 mi (861.99 km) |
| Castenaso to Pepinster | 494.33 mi (795.55 km) |
| Castenaso to Peruwelz | 554.13 mi (891.78 km) |
| Castenaso to Perwez | 523.71 mi (842.83 km) |
| Castenaso to Philippeville | 508.97 mi (819.11 km) |
