| Mentor to Orbetello | 4,483.70 mi (7,215.82 km) |
| Mentor to Oria | 4,830.67 mi (7,774.22 km) |
| Mentor to Oristano | 4,470.17 mi (7,194.04 km) |
| Mentor to Orta Nova | 4,716.17 mi (7,589.94 km) |
| Mentor to Orte | 4,532.01 mi (7,293.56 km) |
| Mentor to Ortona | 4,619.99 mi (7,435.16 km) |
| Mentor to Orvieto | 4,510.29 mi (7,258.61 km) |
| Mentor to Orzinuovi | 4,317.45 mi (6,948.27 km) |
| Mentor to Osimo | 4,536.65 mi (7,301.03 km) |
| Mentor to Ospitaletto | 4,317.37 mi (6,948.14 km) |
| Mentor to Ostuni | 4,818.64 mi (7,754.86 km) |
| Mentor to Ottaviano | 4,684.68 mi (7,539.26 km) |
| Mentor to Ovada | 4,292.70 mi (6,908.44 km) |
| Mentor to Ozieri | 4,461.69 mi (7,180.40 km) |
| Mentor to Paceco | 4,720.44 mi (7,596.81 km) |
