| Sinop to Opwijk | 1,582.42 mi (2,546.65 km) |
| Sinop to Ostend | 1,639.60 mi (2,638.68 km) |
| Sinop to Oud-Heverlee | 1,559.99 mi (2,510.56 km) |
| Sinop to Oud-Turnhout | 1,553.35 mi (2,499.87 km) |
| Sinop to Oudenaarde | 1,605.96 mi (2,584.54 km) |
| Sinop to Oudenburg | 1,635.65 mi (2,632.32 km) |
| Sinop to Oupeye | 1,516.46 mi (2,440.50 km) |
| Sinop to Overijse | 1,565.05 mi (2,518.71 km) |
| Sinop to Overpelt | 1,533.55 mi (2,468.02 km) |
| Sinop to Paal | 1,541.25 mi (2,480.40 km) |
| Sinop to Peer | 1,530.72 mi (2,463.46 km) |
| Sinop to Pepinster | 1,507.02 mi (2,425.32 km) |
| Sinop to Peruwelz | 1,602.85 mi (2,579.54 km) |
| Sinop to Perwez | 1,550.89 mi (2,495.92 km) |
| Sinop to Philippeville | 1,557.27 mi (2,506.18 km) |
