| Dearborn to Orbetello | 4,536.64 mi (7,301.02 km) |
| Dearborn to Oria | 4,881.26 mi (7,855.63 km) |
| Dearborn to Oristano | 4,528.64 mi (7,288.14 km) |
| Dearborn to Orta Nova | 4,767.19 mi (7,672.04 km) |
| Dearborn to Orte | 4,584.03 mi (7,377.29 km) |
| Dearborn to Ortona | 4,670.63 mi (7,516.65 km) |
| Dearborn to Orvieto | 4,562.16 mi (7,342.09 km) |
| Dearborn to Orzinuovi | 4,366.95 mi (7,027.92 km) |
| Dearborn to Osimo | 4,586.38 mi (7,381.07 km) |
| Dearborn to Ospitaletto | 4,366.53 mi (7,027.25 km) |
| Dearborn to Ostuni | 4,868.96 mi (7,835.84 km) |
| Dearborn to Ottaviano | 4,737.33 mi (7,624.00 km) |
| Dearborn to Ovada | 4,344.27 mi (6,991.42 km) |
| Dearborn to Ozieri | 4,518.91 mi (7,272.48 km) |
| Dearborn to Paceco | 4,778.46 mi (7,690.18 km) |
