| Ordu to Opwijk | 1,739.85 mi (2,800.03 km) |
| Ordu to Ostend | 1,796.94 mi (2,891.89 km) |
| Ordu to Oud-Heverlee | 1,717.49 mi (2,764.03 km) |
| Ordu to Oud-Turnhout | 1,710.38 mi (2,752.59 km) |
| Ordu to Oudenaarde | 1,763.54 mi (2,838.15 km) |
| Ordu to Oudenburg | 1,793.02 mi (2,885.58 km) |
| Ordu to Oupeye | 1,673.96 mi (2,693.98 km) |
| Ordu to Overijse | 1,722.61 mi (2,772.27 km) |
| Ordu to Overpelt | 1,690.62 mi (2,720.80 km) |
| Ordu to Paal | 1,698.51 mi (2,733.49 km) |
| Ordu to Peer | 1,687.87 mi (2,716.36 km) |
| Ordu to Pepinster | 1,664.63 mi (2,678.96 km) |
| Ordu to Peruwelz | 1,760.68 mi (2,833.55 km) |
| Ordu to Perwez | 1,708.55 mi (2,749.64 km) |
| Ordu to Philippeville | 1,715.24 mi (2,760.41 km) |
