| Johnstown to Orbetello | 4,435.05 mi (7,137.53 km) |
| Johnstown to Oria | 4,785.41 mi (7,701.37 km) |
| Johnstown to Oristano | 4,412.36 mi (7,101.00 km) |
| Johnstown to Orta Nova | 4,670.35 mi (7,516.20 km) |
| Johnstown to Orte | 4,484.79 mi (7,217.58 km) |
| Johnstown to Ortona | 4,574.93 mi (7,362.64 km) |
| Johnstown to Orvieto | 4,463.37 mi (7,183.10 km) |
| Johnstown to Orzinuovi | 4,274.70 mi (6,879.47 km) |
| Johnstown to Osimo | 4,493.19 mi (7,231.09 km) |
| Johnstown to Ospitaletto | 4,275.17 mi (6,880.22 km) |
| Johnstown to Ostuni | 4,773.84 mi (7,682.75 km) |
| Johnstown to Ottaviano | 4,636.22 mi (7,461.28 km) |
| Johnstown to Ovada | 4,246.61 mi (6,834.25 km) |
| Johnstown to Ozieri | 4,405.99 mi (7,090.75 km) |
| Johnstown to Paceco | 4,663.05 mi (7,504.45 km) |
