| Odorheiu Secuiesc to Orbetello | 744.23 mi (1,197.73 km) |
| Odorheiu Secuiesc to Oria | 555.84 mi (894.53 km) |
| Odorheiu Secuiesc to Oristano | 949.44 mi (1,527.97 km) |
| Odorheiu Secuiesc to Orta Nova | 588.47 mi (947.06 km) |
| Odorheiu Secuiesc to Orte | 690.03 mi (1,110.50 km) |
| Odorheiu Secuiesc to Ortona | 603.68 mi (971.53 km) |
| Odorheiu Secuiesc to Orvieto | 694.72 mi (1,118.04 km) |
| Odorheiu Secuiesc to Orzinuovi | 741.05 mi (1,192.60 km) |
| Odorheiu Secuiesc to Osimo | 609.89 mi (981.52 km) |
| Odorheiu Secuiesc to Ospitaletto | 732.51 mi (1,178.86 km) |
| Odorheiu Secuiesc to Ostuni | 545.57 mi (878.02 km) |
| Odorheiu Secuiesc to Ottaviano | 659.38 mi (1,061.16 km) |
| Odorheiu Secuiesc to Ovada | 813.62 mi (1,309.40 km) |
| Odorheiu Secuiesc to Ozieri | 906.01 mi (1,458.08 km) |
| Odorheiu Secuiesc to Paceco | 868.68 mi (1,398.00 km) |
