| Mardin to Oerlinghausen | 1,850.67 mi (2,978.36 km) |
| Mardin to Oestrich-Winkel | 1,835.78 mi (2,954.41 km) |
| Mardin to Offenburg | 1,812.32 mi (2,916.65 km) |
| Mardin to Oftersheim | 1,798.88 mi (2,895.02 km) |
| Mardin to Ohrdruf | 1,739.60 mi (2,799.61 km) |
| Mardin to Ohringen | 1,755.98 mi (2,825.97 km) |
| Mardin to Olbernhau | 1,630.20 mi (2,623.56 km) |
| Mardin to Olching | 1,657.25 mi (2,667.09 km) |
| Mardin to Oldenburg | 1,897.87 mi (3,054.32 km) |
| Mardin to Oldenburg in Holstein | 1,832.24 mi (2,948.70 km) |
| Mardin to Olfen | 1,896.58 mi (3,052.25 km) |
| Mardin to Olpe | 1,863.12 mi (2,998.40 km) |
| Mardin to Olsberg | 1,843.66 mi (2,967.09 km) |
| Mardin to Oranienburg | 1,696.97 mi (2,731.01 km) |
| Mardin to Ortenberg | 1,798.25 mi (2,894.00 km) |
