| Effingham to Oak Harbor (Washington) | 1,798.65 mi (2,894.64 km) |
| Effingham to Oak Hills (Oregon) | 1,792.00 mi (2,883.94 km) |
| Effingham to Oak Lawn (Illinois) | 184.04 mi (296.18 km) |
| Effingham to Oak Park (California) | 1,701.02 mi (2,737.54 km) |
| Effingham to Oak Park (Illinois) | 195.29 mi (314.30 km) |
| Effingham to Oak Park (Michigan) | 363.54 mi (585.06 km) |
| Effingham to Oak Ridge (Florida) | 841.33 mi (1,353.98 km) |
| Effingham to Oak Ridge (New Jersey) | 753.80 mi (1,213.12 km) |
| Effingham to Oak Ridge (Tennessee) | 319.24 mi (513.76 km) |
| Effingham to Oakdale (California) | 1,741.07 mi (2,801.98 km) |
| Effingham to Oakdale (Minnesota) | 464.14 mi (746.96 km) |
| Effingham to Oakland (California) | 1,813.41 mi (2,918.40 km) |
| Effingham to Oakland (New Jersey) | 767.09 mi (1,234.51 km) |
| Effingham to Oakland Park (Florida) | 1,017.82 mi (1,638.03 km) |
| Effingham to Oakleaf Plantation (Florida) | 726.33 mi (1,168.91 km) |
