| Effingham to Carlsbad (California) | 1,648.64 mi (2,653.22 km) |
| Effingham to Carlsbad (New Mexico) | 992.60 mi (1,597.44 km) |
| Effingham to Carmel (Indiana) | 140.79 mi (226.58 km) |
| Effingham to Carmichael (California) | 1,753.64 mi (2,822.20 km) |
| Effingham to Carney (Maryland) | 643.24 mi (1,035.19 km) |
| Effingham to Carnot-Moon (Pennsylvania) | 452.46 mi (728.17 km) |
| Effingham to Carol Stream (Illinois) | 194.55 mi (313.10 km) |
| Effingham to Carolina (Puerto Rico) | 1,967.95 mi (3,167.11 km) |
| Effingham to Carolina Forest (South Carolina) | 650.46 mi (1,046.81 km) |
| Effingham to Carpentersville (Illinois) | 207.88 mi (334.56 km) |
| Effingham to Carpinteria (California) | 1,735.91 mi (2,793.67 km) |
| Effingham to Carrboro (North Carolina) | 563.21 mi (906.40 km) |
| Effingham to Carroll (Iowa) | 388.75 mi (625.63 km) |
| Effingham to Carrollton (Georgia) | 428.48 mi (689.57 km) |
| Effingham to Carrollton (Texas) | 629.52 mi (1,013.12 km) |
