| Carcassonne to Opwijk | 542.78 mi (873.53 km) |
| Carcassonne to Ostend | 554.48 mi (892.35 km) |
| Carcassonne to Oud-Heverlee | 537.83 mi (865.55 km) |
| Carcassonne to Oud-Turnhout | 573.46 mi (922.90 km) |
| Carcassonne to Oudenaarde | 531.12 mi (854.76 km) |
| Carcassonne to Oudenburg | 551.74 mi (887.94 km) |
| Carcassonne to Oupeye | 540.71 mi (870.19 km) |
| Carcassonne to Overijse | 533.22 mi (858.13 km) |
| Carcassonne to Overpelt | 571.49 mi (919.73 km) |
| Carcassonne to Paal | 556.87 mi (896.20 km) |
| Carcassonne to Peer | 566.35 mi (911.46 km) |
| Carcassonne to Pepinster | 533.85 mi (859.15 km) |
| Carcassonne to Peruwelz | 508.17 mi (817.83 km) |
| Carcassonne to Perwez | 525.23 mi (845.27 km) |
| Carcassonne to Philippeville | 494.02 mi (795.05 km) |
