| Castelnaudary to Opwijk | 538.68 mi (866.93 km) |
| Castelnaudary to Ostend | 548.23 mi (882.29 km) |
| Castelnaudary to Oud-Heverlee | 534.61 mi (860.37 km) |
| Castelnaudary to Oud-Turnhout | 570.44 mi (918.04 km) |
| Castelnaudary to Oudenaarde | 526.10 mi (846.67 km) |
| Castelnaudary to Oudenburg | 545.63 mi (878.10 km) |
| Castelnaudary to Oupeye | 539.20 mi (867.76 km) |
| Castelnaudary to Overijse | 529.81 mi (852.64 km) |
| Castelnaudary to Overpelt | 569.21 mi (916.05 km) |
| Castelnaudary to Paal | 554.34 mi (892.12 km) |
| Castelnaudary to Peer | 564.19 mi (907.98 km) |
| Castelnaudary to Pepinster | 532.76 mi (857.39 km) |
| Castelnaudary to Peruwelz | 503.25 mi (809.90 km) |
| Castelnaudary to Perwez | 522.40 mi (840.72 km) |
| Castelnaudary to Philippeville | 491.03 mi (790.24 km) |
