| Niksar to Octeville | 1,959.03 mi (3,152.75 km) |
| Niksar to Oignies | 1,761.41 mi (2,834.71 km) |
| Niksar to Oissel | 1,835.10 mi (2,953.32 km) |
| Niksar to Olivet | 1,790.45 mi (2,881.45 km) |
| Niksar to Ollioules | 1,601.78 mi (2,577.82 km) |
| Niksar to Olonne-sur-Mer | 1,962.05 mi (3,157.62 km) |
| Niksar to Oloron-Sainte-Marie | 1,924.75 mi (3,097.59 km) |
| Niksar to Onet Village | 1,757.93 mi (2,829.12 km) |
| Niksar to Onnaing | 1,734.23 mi (2,790.97 km) |
| Niksar to Orange | 1,649.28 mi (2,654.26 km) |
| Niksar to Orchies | 1,750.61 mi (2,817.33 km) |
| Niksar to Orleans | 1,790.21 mi (2,881.07 km) |
| Niksar to Orly | 1,772.48 mi (2,852.54 km) |
| Niksar to Ormesson-sur-Marne | 1,766.17 mi (2,842.37 km) |
| Niksar to Orsay | 1,781.51 mi (2,867.06 km) |
