| Miercurea-Ciuc to Orbetello | 768.05 mi (1,236.05 km) |
| Miercurea-Ciuc to Oria | 575.51 mi (926.20 km) |
| Miercurea-Ciuc to Oristano | 972.79 mi (1,565.55 km) |
| Miercurea-Ciuc to Orta Nova | 610.42 mi (982.37 km) |
| Miercurea-Ciuc to Orte | 713.71 mi (1,148.61 km) |
| Miercurea-Ciuc to Ortona | 626.91 mi (1,008.92 km) |
| Miercurea-Ciuc to Orvieto | 718.52 mi (1,156.35 km) |
| Miercurea-Ciuc to Orzinuovi | 764.86 mi (1,230.92 km) |
| Miercurea-Ciuc to Osimo | 633.78 mi (1,019.98 km) |
| Miercurea-Ciuc to Ospitaletto | 756.27 mi (1,217.10 km) |
| Miercurea-Ciuc to Ostuni | 565.56 mi (910.18 km) |
| Miercurea-Ciuc to Ottaviano | 681.53 mi (1,096.82 km) |
| Miercurea-Ciuc to Ovada | 837.57 mi (1,347.94 km) |
| Miercurea-Ciuc to Ozieri | 929.53 mi (1,495.93 km) |
| Miercurea-Ciuc to Paceco | 889.75 mi (1,431.91 km) |
