| Mersin to Orbetello | 1,301.11 mi (2,093.94 km) |
| Mersin to Oria | 950.56 mi (1,529.78 km) |
| Mersin to Oristano | 1,422.08 mi (2,288.61 km) |
| Mersin to Orta Nova | 1,059.74 mi (1,705.49 km) |
| Mersin to Orte | 1,242.49 mi (1,999.60 km) |
| Mersin to Ortona | 1,140.38 mi (1,835.27 km) |
| Mersin to Orvieto | 1,259.70 mi (2,027.29 km) |
| Mersin to Orzinuovi | 1,409.11 mi (2,267.75 km) |
| Mersin to Osimo | 1,204.50 mi (1,938.45 km) |
| Mersin to Ospitaletto | 1,405.66 mi (2,262.19 km) |
| Mersin to Ostuni | 956.09 mi (1,538.68 km) |
| Mersin to Ottaviano | 1,117.67 mi (1,798.71 km) |
| Mersin to Ovada | 1,456.82 mi (2,344.52 km) |
| Mersin to Ozieri | 1,401.50 mi (2,255.50 km) |
| Mersin to Paceco | 1,212.17 mi (1,950.80 km) |
