| Castelsarrasin to Opwijk | 499.55 mi (803.95 km) |
| Castelsarrasin to Ostend | 503.57 mi (810.42 km) |
| Castelsarrasin to Oud-Heverlee | 497.83 mi (801.18 km) |
| Castelsarrasin to Oud-Turnhout | 533.94 mi (859.29 km) |
| Castelsarrasin to Oudenaarde | 484.66 mi (779.98 km) |
| Castelsarrasin to Oudenburg | 501.32 mi (806.80 km) |
| Castelsarrasin to Oupeye | 507.03 mi (815.99 km) |
| Castelsarrasin to Overijse | 492.55 mi (792.68 km) |
| Castelsarrasin to Overpelt | 534.70 mi (860.51 km) |
| Castelsarrasin to Paal | 519.25 mi (835.65 km) |
| Castelsarrasin to Peer | 530.04 mi (853.02 km) |
| Castelsarrasin to Pepinster | 501.80 mi (807.56 km) |
| Castelsarrasin to Peruwelz | 462.24 mi (743.90 km) |
| Castelsarrasin to Perwez | 486.77 mi (783.38 km) |
| Castelsarrasin to Philippeville | 455.23 mi (732.62 km) |
