| Niksar to Nuth | 1,643.70 mi (2,645.29 km) |
| Niksar to Oegstgeest | 1,724.13 mi (2,774.71 km) |
| Niksar to Oirschot | 1,677.89 mi (2,700.31 km) |
| Niksar to Oisterwijk | 1,683.47 mi (2,709.29 km) |
| Niksar to Oldebroek | 1,670.90 mi (2,689.06 km) |
| Niksar to Oldenzaal | 1,626.56 mi (2,617.70 km) |
| Niksar to Ommen | 1,651.52 mi (2,657.86 km) |
| Niksar to Oosterend | 1,675.84 mi (2,697.00 km) |
| Niksar to Oosterhout | 1,698.76 mi (2,733.88 km) |
| Niksar to Oosterwolde | 1,666.67 mi (2,682.25 km) |
| Niksar to Oostzaan | 1,711.67 mi (2,754.67 km) |
| Niksar to Opmeer | 1,714.07 mi (2,758.52 km) |
| Niksar to Oss | 1,673.55 mi (2,693.31 km) |
| Niksar to Oud-Beijerland | 1,720.62 mi (2,769.08 km) |
| Niksar to Oudenbosch | 1,711.75 mi (2,754.79 km) |
