| Effingham to Octeville | 4,109.87 mi (6,614.19 km) |
| Effingham to Oignies | 4,266.45 mi (6,866.19 km) |
| Effingham to Oissel | 4,228.28 mi (6,804.76 km) |
| Effingham to Olivet | 4,309.24 mi (6,935.05 km) |
| Effingham to Ollioules | 4,640.90 mi (7,468.81 km) |
| Effingham to Olonne-sur-Mer | 4,200.48 mi (6,760.02 km) |
| Effingham to Oloron-Sainte-Marie | 4,361.00 mi (7,018.36 km) |
| Effingham to Onet Village | 4,458.29 mi (7,174.93 km) |
| Effingham to Onnaing | 4,292.51 mi (6,908.13 km) |
| Effingham to Orange | 4,560.09 mi (7,338.75 km) |
| Effingham to Orchies | 4,275.96 mi (6,881.50 km) |
| Effingham to Orleans | 4,308.29 mi (6,933.53 km) |
| Effingham to Orly | 4,299.76 mi (6,919.79 km) |
| Effingham to Ormesson-sur-Marne | 4,304.17 mi (6,926.89 km) |
| Effingham to Orsay | 4,293.07 mi (6,909.02 km) |
