| Ordu to Oerlinghausen | 1,568.69 mi (2,524.56 km) |
| Ordu to Oestrich-Winkel | 1,562.38 mi (2,514.40 km) |
| Ordu to Offenburg | 1,546.70 mi (2,489.18 km) |
| Ordu to Oftersheim | 1,528.06 mi (2,459.17 km) |
| Ordu to Ohrdruf | 1,460.29 mi (2,350.12 km) |
| Ordu to Ohringen | 1,485.29 mi (2,390.34 km) |
| Ordu to Olbernhau | 1,349.03 mi (2,171.05 km) |
| Ordu to Olching | 1,390.42 mi (2,237.66 km) |
| Ordu to Oldenburg | 1,612.36 mi (2,594.84 km) |
| Ordu to Oldenburg in Holstein | 1,541.94 mi (2,481.51 km) |
| Ordu to Olfen | 1,616.45 mi (2,601.42 km) |
| Ordu to Olpe | 1,585.40 mi (2,551.46 km) |
| Ordu to Olsberg | 1,564.13 mi (2,517.22 km) |
| Ordu to Oranienburg | 1,408.76 mi (2,267.19 km) |
| Ordu to Ortenberg | 1,522.40 mi (2,450.07 km) |
