| Niksar to Oberkirch | 1,513.21 mi (2,435.27 km) |
| Niksar to Obernburg am Main | 1,486.29 mi (2,391.95 km) |
| Niksar to Obernkirchen | 1,538.24 mi (2,475.57 km) |
| Niksar to Oberschleissheim | 1,352.82 mi (2,177.16 km) |
| Niksar to Oberstdorf | 1,399.52 mi (2,252.32 km) |
| Niksar to Obertraubling | 1,339.06 mi (2,155.00 km) |
| Niksar to Obertshausen | 1,503.55 mi (2,419.74 km) |
| Niksar to Oberursel | 1,516.97 mi (2,441.32 km) |
| Niksar to Ochsenfurt | 1,442.98 mi (2,322.26 km) |
| Niksar to Ochsenhausen | 1,423.04 mi (2,290.16 km) |
| Niksar to Ochtrup | 1,613.86 mi (2,597.26 km) |
| Niksar to Odenthal | 1,593.74 mi (2,564.88 km) |
| Niksar to Oelde | 1,567.08 mi (2,521.97 km) |
| Niksar to Oelsnitz | 1,370.40 mi (2,205.44 km) |
| Niksar to Oer-Erkenschwick | 1,599.78 mi (2,574.60 km) |
