| Niksar to Oerlinghausen | 1,549.19 mi (2,493.18 km) |
| Niksar to Oestrich-Winkel | 1,538.22 mi (2,475.53 km) |
| Niksar to Offenburg | 1,519.14 mi (2,444.83 km) |
| Niksar to Oftersheim | 1,502.69 mi (2,418.34 km) |
| Niksar to Ohrdruf | 1,439.15 mi (2,316.09 km) |
| Niksar to Ohringen | 1,459.83 mi (2,349.37 km) |
| Niksar to Olbernhau | 1,328.94 mi (2,138.72 km) |
| Niksar to Olching | 1,363.22 mi (2,193.89 km) |
| Niksar to Oldenburg | 1,595.25 mi (2,567.31 km) |
| Niksar to Oldenburg in Holstein | 1,528.90 mi (2,460.52 km) |
| Niksar to Olfen | 1,595.85 mi (2,568.27 km) |
| Niksar to Olpe | 1,563.44 mi (2,516.12 km) |
| Niksar to Olsberg | 1,543.17 mi (2,483.49 km) |
| Niksar to Oranienburg | 1,393.76 mi (2,243.05 km) |
| Niksar to Ortenberg | 1,499.43 mi (2,413.09 km) |
