| Effingham to Conyers (Georgia) | 454.01 mi (730.66 km) |
| Effingham to Cookeville (Tennessee) | 264.24 mi (425.26 km) |
| Effingham to Coolidge (Arizona) | 1,348.61 mi (2,170.38 km) |
| Effingham to Coon Rapids (Minnesota) | 483.98 mi (778.89 km) |
| Effingham to Cooper City (Florida) | 1,022.34 mi (1,645.30 km) |
| Effingham to Coos Bay (Oregon) | 1,862.28 mi (2,997.04 km) |
| Effingham to Copiague (New York) | 809.63 mi (1,302.97 km) |
| Effingham to Coppell (Texas) | 634.47 mi (1,021.09 km) |
| Effingham to Copperas Cove (Texas) | 764.39 mi (1,230.17 km) |
| Effingham to Coral Gables (Florida) | 1,044.08 mi (1,680.28 km) |
| Effingham to Coral Springs (Florida) | 1,009.19 mi (1,624.13 km) |
| Effingham to Coral Terrace (Florida) | 1,040.52 mi (1,674.56 km) |
| Effingham to Coralville (Iowa) | 239.58 mi (385.57 km) |
| Effingham to Coram (New York) | 830.57 mi (1,336.68 km) |
| Effingham to Corcoran (California) | 1,702.09 mi (2,739.25 km) |
