| Mardin to Orbetello | 1,596.35 mi (2,569.08 km) |
| Mardin to Oria | 1,257.70 mi (2,024.07 km) |
| Mardin to Oristano | 1,735.26 mi (2,792.63 km) |
| Mardin to Orta Nova | 1,360.99 mi (2,190.30 km) |
| Mardin to Orte | 1,536.71 mi (2,473.10 km) |
| Mardin to Ortona | 1,433.69 mi (2,307.29 km) |
| Mardin to Orvieto | 1,551.96 mi (2,497.64 km) |
| Mardin to Orzinuovi | 1,680.11 mi (2,703.88 km) |
| Mardin to Osimo | 1,488.35 mi (2,395.27 km) |
| Mardin to Ospitaletto | 1,675.04 mi (2,695.71 km) |
| Mardin to Ostuni | 1,261.14 mi (2,029.61 km) |
| Mardin to Ottaviano | 1,423.79 mi (2,291.37 km) |
| Mardin to Ovada | 1,736.00 mi (2,793.83 km) |
| Mardin to Ozieri | 1,710.63 mi (2,753.00 km) |
| Mardin to Paceco | 1,536.69 mi (2,473.07 km) |
