| Overlea to Orbetello | 4,367.95 mi (7,029.53 km) |
| Overlea to Oria | 4,720.73 mi (7,597.28 km) |
| Overlea to Oristano | 4,337.49 mi (6,980.51 km) |
| Overlea to Orta Nova | 4,605.35 mi (7,411.59 km) |
| Overlea to Orte | 4,418.84 mi (7,111.44 km) |
| Overlea to Ortona | 4,510.71 mi (7,259.28 km) |
| Overlea to Orvieto | 4,397.70 mi (7,077.42 km) |
| Overlea to Orzinuovi | 4,212.89 mi (6,780.00 km) |
| Overlea to Osimo | 4,430.45 mi (7,130.12 km) |
| Overlea to Ospitaletto | 4,213.83 mi (6,781.51 km) |
| Overlea to Ostuni | 4,709.57 mi (7,579.32 km) |
| Overlea to Ottaviano | 4,569.01 mi (7,353.10 km) |
| Overlea to Ovada | 4,181.95 mi (6,730.20 km) |
| Overlea to Ozieri | 4,332.91 mi (6,973.14 km) |
| Overlea to Paceco | 4,588.21 mi (7,384.01 km) |
