| Huercal-Overa to Orbetello | 778.18 mi (1,252.36 km) |
| Huercal-Overa to Oria | 1,070.96 mi (1,723.55 km) |
| Huercal-Overa to Oristano | 593.68 mi (955.44 km) |
| Huercal-Overa to Orta Nova | 979.32 mi (1,576.06 km) |
| Huercal-Overa to Orte | 834.49 mi (1,342.99 km) |
| Huercal-Overa to Ortona | 929.78 mi (1,496.33 km) |
| Huercal-Overa to Orvieto | 827.75 mi (1,332.13 km) |
| Huercal-Overa to Orzinuovi | 826.14 mi (1,329.54 km) |
| Huercal-Overa to Osimo | 911.78 mi (1,467.37 km) |
| Huercal-Overa to Ospitaletto | 838.09 mi (1,348.77 km) |
| Huercal-Overa to Ostuni | 1,069.96 mi (1,721.93 km) |
| Huercal-Overa to Ottaviano | 910.21 mi (1,464.84 km) |
| Huercal-Overa to Ovada | 744.23 mi (1,197.73 km) |
| Huercal-Overa to Ozieri | 627.11 mi (1,009.23 km) |
| Huercal-Overa to Paceco | 792.24 mi (1,274.99 km) |
