| Effingham to Cloverleaf (Texas) | 746.50 mi (1,201.38 km) |
| Effingham to Cloverly (Maryland) | 618.85 mi (995.94 km) |
| Effingham to Clovis (California) | 1,694.69 mi (2,727.34 km) |
| Effingham to Clovis (New Mexico) | 871.17 mi (1,402.02 km) |
| Effingham to Clute (Texas) | 799.39 mi (1,286.50 km) |
| Effingham to Coachella (California) | 1,572.95 mi (2,531.41 km) |
| Effingham to Coalinga (California) | 1,741.80 mi (2,803.15 km) |
| Effingham to Coamo (Puerto Rico) | 1,970.17 mi (3,170.68 km) |
| Effingham to Coatesville (Pennsylvania) | 680.26 mi (1,094.77 km) |
| Effingham to Cockeysville (Maryland) | 637.42 mi (1,025.84 km) |
| Effingham to Cocoa (Florida) | 865.43 mi (1,392.78 km) |
| Effingham to Cocoa Beach (Florida) | 872.55 mi (1,404.24 km) |
| Effingham to Coconut Creek (Florida) | 1,010.63 mi (1,626.45 km) |
| Effingham to Coeur d'Alene (Idaho) | 1,525.74 mi (2,455.45 km) |
| Effingham to Cohoes (New York) | 813.41 mi (1,309.06 km) |
