| Mersin to Oerlinghausen | 1,640.44 mi (2,640.03 km) |
| Mersin to Oestrich-Winkel | 1,604.67 mi (2,582.46 km) |
| Mersin to Offenburg | 1,566.47 mi (2,520.98 km) |
| Mersin to Oftersheim | 1,563.00 mi (2,515.41 km) |
| Mersin to Ohrdruf | 1,524.04 mi (2,452.70 km) |
| Mersin to Ohringen | 1,520.56 mi (2,447.11 km) |
| Mersin to Olbernhau | 1,421.88 mi (2,288.30 km) |
| Mersin to Olching | 1,416.28 mi (2,279.29 km) |
| Mersin to Oldenburg | 1,697.85 mi (2,732.43 km) |
| Mersin to Oldenburg in Holstein | 1,652.39 mi (2,659.27 km) |
| Mersin to Olfen | 1,680.51 mi (2,704.51 km) |
| Mersin to Olpe | 1,641.42 mi (2,641.61 km) |
| Mersin to Olsberg | 1,626.87 mi (2,618.20 km) |
| Mersin to Oranienburg | 1,510.56 mi (2,431.01 km) |
| Mersin to Ortenberg | 1,573.16 mi (2,531.76 km) |
