| Effingham to Oerlinghausen | 4,428.37 mi (7,126.78 km) |
| Effingham to Oestrich-Winkel | 4,474.33 mi (7,200.74 km) |
| Effingham to Offenburg | 4,527.67 mi (7,286.57 km) |
| Effingham to Oftersheim | 4,519.49 mi (7,273.41 km) |
| Effingham to Ohrdruf | 4,545.60 mi (7,315.43 km) |
| Effingham to Ohringen | 4,560.62 mi (7,339.60 km) |
| Effingham to Olbernhau | 4,646.32 mi (7,477.53 km) |
| Effingham to Olching | 4,667.83 mi (7,512.14 km) |
| Effingham to Oldenburg | 4,370.41 mi (7,033.50 km) |
| Effingham to Oldenburg in Holstein | 4,422.82 mi (7,117.84 km) |
| Effingham to Olfen | 4,390.17 mi (7,065.29 km) |
| Effingham to Olpe | 4,431.58 mi (7,131.94 km) |
| Effingham to Olsberg | 4,443.75 mi (7,151.52 km) |
| Effingham to Oranienburg | 4,561.85 mi (7,341.59 km) |
| Effingham to Ortenberg | 4,501.06 mi (7,243.75 km) |
