| Castelsarrasin to Oignies | 452.90 mi (728.87 km) |
| Castelsarrasin to Oissel | 366.33 mi (589.55 km) |
| Castelsarrasin to Olivet | 266.94 mi (429.60 km) |
| Castelsarrasin to Ollioules | 245.19 mi (394.60 km) |
| Castelsarrasin to Olonne-sur-Mer | 222.09 mi (357.42 km) |
| Castelsarrasin to Oloron-Sainte-Marie | 103.74 mi (166.95 km) |
| Castelsarrasin to Onet Village | 77.00 mi (123.91 km) |
| Castelsarrasin to Onnaing | 453.84 mi (730.38 km) |
| Castelsarrasin to Orange | 183.87 mi (295.91 km) |
| Castelsarrasin to Orchies | 455.70 mi (733.38 km) |
| Castelsarrasin to Orleans | 269.63 mi (433.93 km) |
| Castelsarrasin to Orly | 330.72 mi (532.24 km) |
| Castelsarrasin to Ormesson-sur-Marne | 334.90 mi (538.97 km) |
| Castelsarrasin to Orsay | 325.93 mi (524.54 km) |
| Castelsarrasin to Orthez | 101.15 mi (162.79 km) |
