| Johnstown to Octeville | 3,662.10 mi (5,893.59 km) |
| Johnstown to Oignies | 3,829.96 mi (6,163.73 km) |
| Johnstown to Oissel | 3,783.14 mi (6,088.38 km) |
| Johnstown to Olivet | 3,858.27 mi (6,209.29 km) |
| Johnstown to Ollioules | 4,176.43 mi (6,721.31 km) |
| Johnstown to Olonne-sur-Mer | 3,738.00 mi (6,015.74 km) |
| Johnstown to Oloron-Sainte-Marie | 3,886.66 mi (6,254.98 km) |
| Johnstown to Onet Village | 3,993.31 mi (6,426.62 km) |
| Johnstown to Onnaing | 3,856.58 mi (6,206.57 km) |
| Johnstown to Orange | 4,097.79 mi (6,594.75 km) |
| Johnstown to Orchies | 3,839.91 mi (6,179.73 km) |
| Johnstown to Orleans | 3,857.52 mi (6,208.08 km) |
| Johnstown to Orly | 3,853.73 mi (6,201.97 km) |
| Johnstown to Ormesson-sur-Marne | 3,858.57 mi (6,209.77 km) |
| Johnstown to Orsay | 3,846.49 mi (6,190.33 km) |
