| Castellamonte to Octeville | 525.41 mi (845.57 km) |
| Castellamonte to Oignies | 413.65 mi (665.71 km) |
| Castellamonte to Oissel | 413.08 mi (664.80 km) |
| Castellamonte to Olivet | 324.61 mi (522.41 km) |
| Castellamonte to Ollioules | 180.34 mi (290.23 km) |
| Castellamonte to Olonne-sur-Mer | 462.21 mi (743.85 km) |
| Castellamonte to Oloron-Sainte-Marie | 438.08 mi (705.02 km) |
| Castellamonte to Onet Village | 260.22 mi (418.79 km) |
| Castellamonte to Onnaing | 394.77 mi (635.32 km) |
| Castellamonte to Orange | 166.30 mi (267.63 km) |
| Castellamonte to Orchies | 407.99 mi (656.60 km) |
| Castellamonte to Orleans | 325.60 mi (524.01 km) |
| Castellamonte to Orly | 341.37 mi (549.38 km) |
| Castellamonte to Ormesson-sur-Marne | 338.32 mi (544.47 km) |
| Castellamonte to Orsay | 346.49 mi (557.62 km) |
