| Effingham to Cordele (Georgia) | 563.06 mi (906.16 km) |
| Effingham to Corinth (Mississippi) | 288.34 mi (464.04 km) |
| Effingham to Corinth (Texas) | 629.11 mi (1,012.46 km) |
| Effingham to Cornelius (North Carolina) | 490.90 mi (790.02 km) |
| Effingham to Cornelius (Oregon) | 1,802.09 mi (2,900.18 km) |
| Effingham to Corning (New York) | 637.35 mi (1,025.71 km) |
| Effingham to Corona (California) | 1,644.61 mi (2,646.74 km) |
| Effingham to Coronado (California) | 1,654.63 mi (2,662.87 km) |
| Effingham to Corpus Christi (Texas) | 936.37 mi (1,506.94 km) |
| Effingham to Corsicana (Texas) | 658.39 mi (1,059.58 km) |
| Effingham to Cortland (New York) | 688.99 mi (1,108.82 km) |
| Effingham to Corvallis (Oregon) | 1,812.27 mi (2,916.56 km) |
| Effingham to Coshocton (Ohio) | 364.90 mi (587.24 km) |
| Effingham to Costa Mesa (California) | 1,668.16 mi (2,684.65 km) |
| Effingham to Coto de Caza (California) | 1,652.46 mi (2,659.37 km) |
