| Niksar to Opwijk | 1,716.66 mi (2,762.70 km) |
| Niksar to Ostend | 1,773.97 mi (2,854.92 km) |
| Niksar to Oud-Heverlee | 1,694.14 mi (2,726.46 km) |
| Niksar to Oud-Turnhout | 1,688.12 mi (2,716.76 km) |
| Niksar to Oudenaarde | 1,739.97 mi (2,800.22 km) |
| Niksar to Oudenburg | 1,769.98 mi (2,848.50 km) |
| Niksar to Oupeye | 1,650.62 mi (2,656.42 km) |
| Niksar to Overijse | 1,699.13 mi (2,734.48 km) |
| Niksar to Overpelt | 1,668.28 mi (2,684.84 km) |
| Niksar to Paal | 1,675.73 mi (2,696.83 km) |
| Niksar to Peer | 1,665.36 mi (2,680.14 km) |
| Niksar to Pepinster | 1,641.03 mi (2,640.99 km) |
| Niksar to Peruwelz | 1,736.44 mi (2,794.53 km) |
| Niksar to Perwez | 1,684.81 mi (2,711.44 km) |
| Niksar to Philippeville | 1,690.57 mi (2,720.71 km) |
