| Castelleone to Octeville | 610.09 mi (981.85 km) |
| Castelleone to Oignies | 475.11 mi (764.61 km) |
| Castelleone to Oissel | 492.51 mi (792.62 km) |
| Castelleone to Olivet | 413.06 mi (664.75 km) |
| Castelleone to Ollioules | 244.42 mi (393.35 km) |
| Castelleone to Olonne-sur-Mer | 560.48 mi (902.00 km) |
| Castelleone to Oloron-Sainte-Marie | 532.87 mi (857.57 km) |
| Castelleone to Onet Village | 356.91 mi (574.39 km) |
| Castelleone to Onnaing | 452.95 mi (728.95 km) |
| Castelleone to Orange | 255.86 mi (411.76 km) |
| Castelleone to Orchies | 467.84 mi (752.91 km) |
| Castelleone to Orleans | 413.73 mi (665.83 km) |
| Castelleone to Orly | 420.67 mi (677.00 km) |
| Castelleone to Ormesson-sur-Marne | 416.60 mi (670.46 km) |
| Castelleone to Orsay | 427.04 mi (687.26 km) |
