| Casale Monferrato to Octeville | 564.68 mi (908.77 km) |
| Casale Monferrato to Oignies | 447.16 mi (719.64 km) |
| Casale Monferrato to Oissel | 451.24 mi (726.21 km) |
| Casale Monferrato to Olivet | 364.30 mi (586.28 km) |
| Casale Monferrato to Ollioules | 189.09 mi (304.32 km) |
| Casale Monferrato to Olonne-sur-Mer | 501.57 mi (807.20 km) |
| Casale Monferrato to Oloron-Sainte-Marie | 468.57 mi (754.09 km) |
| Casale Monferrato to Onet Village | 292.57 mi (470.84 km) |
| Casale Monferrato to Onnaing | 427.24 mi (687.58 km) |
| Casale Monferrato to Orange | 192.11 mi (309.17 km) |
| Casale Monferrato to Orchies | 441.01 mi (709.73 km) |
| Casale Monferrato to Orleans | 365.25 mi (587.81 km) |
| Casale Monferrato to Orly | 379.37 mi (610.53 km) |
| Casale Monferrato to Ormesson-sur-Marne | 376.08 mi (605.24 km) |
| Casale Monferrato to Orsay | 384.77 mi (619.23 km) |
