| Chillicothe to Octeville | 3,873.58 mi (6,233.92 km) |
| Chillicothe to Oignies | 4,037.91 mi (6,498.38 km) |
| Chillicothe to Oissel | 3,993.86 mi (6,427.50 km) |
| Chillicothe to Olivet | 4,070.89 mi (6,551.46 km) |
| Chillicothe to Ollioules | 4,393.29 mi (7,070.32 km) |
| Chillicothe to Olonne-sur-Mer | 3,954.08 mi (6,363.47 km) |
| Chillicothe to Oloron-Sainte-Marie | 4,106.21 mi (6,608.30 km) |
| Chillicothe to Onet Village | 4,210.25 mi (6,775.74 km) |
| Chillicothe to Onnaing | 4,064.36 mi (6,540.96 km) |
| Chillicothe to Orange | 4,313.98 mi (6,942.68 km) |
| Chillicothe to Orchies | 4,047.72 mi (6,514.17 km) |
| Chillicothe to Orleans | 4,070.07 mi (6,550.15 km) |
| Chillicothe to Orly | 4,064.78 mi (6,541.63 km) |
| Chillicothe to Ormesson-sur-Marne | 4,069.49 mi (6,549.21 km) |
| Chillicothe to Orsay | 4,057.71 mi (6,530.26 km) |
