| Effingham to Cadillac (Michigan) | 389.45 mi (626.76 km) |
| Effingham to Caguas (Puerto Rico) | 1,974.90 mi (3,178.29 km) |
| Effingham to Cahokia (Illinois) | 95.67 mi (153.96 km) |
| Effingham to Calabasas (California) | 1,696.92 mi (2,730.93 km) |
| Effingham to Caldwell (Idaho) | 1,482.78 mi (2,386.31 km) |
| Effingham to Caledonia (Wisconsin) | 256.56 mi (412.89 km) |
| Effingham to Calera (Alabama) | 426.28 mi (686.03 km) |
| Effingham to Calexico (California) | 1,565.51 mi (2,519.45 km) |
| Effingham to Calhoun (Georgia) | 377.08 mi (606.85 km) |
| Effingham to California (Maryland) | 652.01 mi (1,049.31 km) |
| Effingham to California City (California) | 1,630.73 mi (2,624.41 km) |
| Effingham to Callaway (Florida) | 643.64 mi (1,035.85 km) |
| Effingham to Calumet City (Illinois) | 180.11 mi (289.86 km) |
| Effingham to Calverton (Maryland) | 621.79 mi (1,000.67 km) |
| Effingham to Camano (Washington) | 1,790.20 mi (2,881.06 km) |
