| Effingham to Castle Pines (Colorado) | 871.80 mi (1,403.03 km) |
| Effingham to Castle Rock (Colorado) | 871.29 mi (1,402.21 km) |
| Effingham to Castro Valley (California) | 1,806.54 mi (2,907.35 km) |
| Effingham to Catalina Foothills (Arizona) | 1,334.15 mi (2,147.11 km) |
| Effingham to Cataño (Puerto Rico) | 1,959.48 mi (3,153.48 km) |
| Effingham to Cathedral City (California) | 1,586.40 mi (2,553.06 km) |
| Effingham to Catonsville (Maryland) | 631.97 mi (1,017.05 km) |
| Effingham to Cave Spring (Virginia) | 481.98 mi (775.66 km) |
| Effingham to Cayce (South Carolina) | 548.79 mi (883.19 km) |
| Effingham to Cayey (Puerto Rico) | 1,976.19 mi (3,180.37 km) |
| Effingham to Cedar City (Utah) | 1,328.66 mi (2,138.28 km) |
| Effingham to Cedar Falls (Iowa) | 311.04 mi (500.58 km) |
| Effingham to Cedar Hill (Texas) | 652.02 mi (1,049.33 km) |
| Effingham to Cedar Lake (Indiana) | 166.09 mi (267.30 km) |
| Effingham to Cedar Mill (Oregon) | 1,790.02 mi (2,880.75 km) |
