| Dayton to Octeville | 3,903.72 mi (6,282.43 km) |
| Dayton to Oignies | 4,065.35 mi (6,542.56 km) |
| Dayton to Oissel | 4,023.37 mi (6,474.99 km) |
| Dayton to Olivet | 4,101.84 mi (6,601.28 km) |
| Dayton to Ollioules | 4,427.79 mi (7,125.83 km) |
| Dayton to Olonne-sur-Mer | 3,987.99 mi (6,418.05 km) |
| Dayton to Oloron-Sainte-Marie | 4,143.43 mi (6,668.21 km) |
| Dayton to Onet Village | 4,244.86 mi (6,831.44 km) |
| Dayton to Onnaing | 4,091.68 mi (6,584.93 km) |
| Dayton to Orange | 4,347.88 mi (6,997.24 km) |
| Dayton to Orchies | 4,075.06 mi (6,558.18 km) |
| Dayton to Orleans | 4,100.98 mi (6,599.89 km) |
| Dayton to Orly | 4,094.51 mi (6,589.48 km) |
| Dayton to Ormesson-sur-Marne | 4,099.12 mi (6,596.89 km) |
| Dayton to Orsay | 4,087.58 mi (6,578.32 km) |
