| Olgiate Olona to Octeville | 561.75 mi (904.04 km) |
| Olgiate Olona to Oignies | 430.58 mi (692.95 km) |
| Olgiate Olona to Oissel | 444.62 mi (715.55 km) |
| Olgiate Olona to Olivet | 364.56 mi (586.70 km) |
| Olgiate Olona to Ollioules | 228.37 mi (367.53 km) |
| Olgiate Olona to Olonne-sur-Mer | 514.06 mi (827.30 km) |
| Olgiate Olona to Oloron-Sainte-Marie | 497.39 mi (800.47 km) |
| Olgiate Olona to Onet Village | 319.44 mi (514.08 km) |
| Olgiate Olona to Onnaing | 409.16 mi (658.48 km) |
| Olgiate Olona to Orange | 224.54 mi (361.37 km) |
| Olgiate Olona to Orchies | 423.68 mi (681.84 km) |
| Olgiate Olona to Orleans | 365.23 mi (587.78 km) |
| Olgiate Olona to Orly | 372.71 mi (599.82 km) |
| Olgiate Olona to Ormesson-sur-Marne | 368.76 mi (593.47 km) |
| Olgiate Olona to Orsay | 378.96 mi (609.87 km) |
