| Castelnaudary to Oignies | 496.51 mi (799.06 km) |
| Castelnaudary to Oissel | 418.23 mi (673.07 km) |
| Castelnaudary to Olivet | 314.09 mi (505.49 km) |
| Castelnaudary to Ollioules | 196.36 mi (316.00 km) |
| Castelnaudary to Olonne-sur-Mer | 287.45 mi (462.61 km) |
| Castelnaudary to Oloron-Sainte-Marie | 129.13 mi (207.81 km) |
| Castelnaudary to Onet Village | 79.08 mi (127.27 km) |
| Castelnaudary to Onnaing | 494.57 mi (795.94 km) |
| Castelnaudary to Orange | 153.42 mi (246.91 km) |
| Castelnaudary to Orchies | 498.19 mi (801.76 km) |
| Castelnaudary to Orleans | 316.76 mi (509.77 km) |
| Castelnaudary to Orly | 375.48 mi (604.27 km) |
| Castelnaudary to Ormesson-sur-Marne | 378.82 mi (609.65 km) |
| Castelnaudary to Orsay | 371.89 mi (598.50 km) |
| Castelnaudary to Orthez | 137.27 mi (220.92 km) |
