| Butte to Orbetello | 5,427.71 mi (8,735.05 km) |
| Butte to Oria | 5,725.38 mi (9,214.12 km) |
| Butte to Oristano | 5,486.64 mi (8,829.90 km) |
| Butte to Orta Nova | 5,622.67 mi (9,048.81 km) |
| Butte to Orte | 5,461.54 mi (8,789.49 km) |
| Butte to Ortona | 5,526.57 mi (8,894.16 km) |
| Butte to Orvieto | 5,438.87 mi (8,753.02 km) |
| Butte to Orzinuovi | 5,225.63 mi (8,409.84 km) |
| Butte to Osimo | 5,435.78 mi (8,748.05 km) |
| Butte to Ospitaletto | 5,221.19 mi (8,402.69 km) |
| Butte to Ostuni | 5,710.37 mi (9,189.94 km) |
| Butte to Ottaviano | 5,614.51 mi (9,035.68 km) |
| Butte to Ovada | 5,229.00 mi (8,415.26 km) |
| Butte to Ozieri | 5,462.37 mi (8,790.84 km) |
| Butte to Paceco | 5,719.27 mi (9,204.27 km) |
