| Johnstown to Oerlinghausen | 4,009.36 mi (6,452.44 km) |
| Johnstown to Oestrich-Winkel | 4,043.95 mi (6,508.10 km) |
| Johnstown to Offenburg | 4,089.69 mi (6,581.72 km) |
| Johnstown to Oftersheim | 4,087.05 mi (6,577.46 km) |
| Johnstown to Ohrdruf | 4,124.46 mi (6,637.67 km) |
| Johnstown to Ohringen | 4,129.03 mi (6,645.04 km) |
| Johnstown to Olbernhau | 4,229.44 mi (6,806.63 km) |
| Johnstown to Olching | 4,234.94 mi (6,815.47 km) |
| Johnstown to Oldenburg | 3,957.02 mi (6,368.20 km) |
| Johnstown to Oldenburg in Holstein | 4,020.74 mi (6,470.76 km) |
| Johnstown to Olfen | 3,967.55 mi (6,385.15 km) |
| Johnstown to Olpe | 4,006.08 mi (6,447.16 km) |
| Johnstown to Olsberg | 4,021.14 mi (6,471.40 km) |
| Johnstown to Oranienburg | 4,155.69 mi (6,687.94 km) |
| Johnstown to Ortenberg | 4,074.38 mi (6,557.08 km) |
