| Niksar to Orbetello | 1,333.50 mi (2,146.06 km) |
| Niksar to Oria | 1,013.09 mi (1,630.42 km) |
| Niksar to Oristano | 1,490.70 mi (2,399.05 km) |
| Niksar to Orta Nova | 1,107.51 mi (1,782.37 km) |
| Niksar to Orte | 1,273.67 mi (2,049.77 km) |
| Niksar to Ortona | 1,171.26 mi (1,884.97 km) |
| Niksar to Orvieto | 1,287.01 mi (2,071.24 km) |
| Niksar to Orzinuovi | 1,398.98 mi (2,251.43 km) |
| Niksar to Osimo | 1,217.50 mi (1,959.38 km) |
| Niksar to Ospitaletto | 1,393.04 mi (2,241.87 km) |
| Niksar to Ostuni | 1,013.96 mi (1,631.81 km) |
| Niksar to Ottaviano | 1,174.63 mi (1,890.39 km) |
| Niksar to Ovada | 1,459.38 mi (2,348.65 km) |
| Niksar to Ozieri | 1,461.08 mi (2,351.39 km) |
| Niksar to Paceco | 1,313.80 mi (2,114.36 km) |
