| Cologno al Serio to Octeville | 596.87 mi (960.57 km) |
| Cologno al Serio to Oignies | 457.89 mi (736.90 km) |
| Cologno al Serio to Oissel | 478.24 mi (769.66 km) |
| Cologno al Serio to Olivet | 401.38 mi (645.96 km) |
| Cologno al Serio to Ollioules | 254.39 mi (409.39 km) |
| Cologno al Serio to Olonne-sur-Mer | 553.48 mi (890.74 km) |
| Cologno al Serio to Oloron-Sainte-Marie | 534.54 mi (860.26 km) |
| Cologno al Serio to Onet Village | 357.26 mi (574.95 km) |
| Cologno al Serio to Onnaing | 435.39 mi (700.69 km) |
| Cologno al Serio to Orange | 259.42 mi (417.50 km) |
| Cologno al Serio to Orchies | 450.44 mi (724.91 km) |
| Cologno al Serio to Orleans | 401.95 mi (646.87 km) |
| Cologno al Serio to Orly | 406.57 mi (654.32 km) |
| Cologno al Serio to Ormesson-sur-Marne | 402.30 mi (647.45 km) |
| Cologno al Serio to Orsay | 413.21 mi (664.99 km) |
