| Carcassonne to Oignies | 502.48 mi (808.66 km) |
| Carcassonne to Oissel | 427.90 mi (688.64 km) |
| Carcassonne to Olivet | 322.29 mi (518.67 km) |
| Carcassonne to Ollioules | 176.26 mi (283.66 km) |
| Carcassonne to Olonne-sur-Mer | 305.80 mi (492.13 km) |
| Carcassonne to Oloron-Sainte-Marie | 148.91 mi (239.65 km) |
| Carcassonne to Onet Village | 80.76 mi (129.98 km) |
| Carcassonne to Onnaing | 499.42 mi (803.74 km) |
| Carcassonne to Orange | 138.64 mi (223.12 km) |
| Carcassonne to Orchies | 503.71 mi (810.64 km) |
| Carcassonne to Orleans | 324.92 mi (522.91 km) |
| Carcassonne to Orly | 382.36 mi (615.35 km) |
| Carcassonne to Ormesson-sur-Marne | 385.36 mi (620.17 km) |
| Carcassonne to Orsay | 379.27 mi (610.38 km) |
| Carcassonne to Orthez | 157.96 mi (254.22 km) |
