| Delaware to Castle Pines (Colorado) | 1,154.27 mi (1,857.62 km) |
| Delaware to Castle Rock (Colorado) | 1,154.40 mi (1,857.83 km) |
| Delaware to Castro Valley (California) | 2,084.27 mi (3,354.31 km) |
| Delaware to Catalina Foothills (Arizona) | 1,635.70 mi (2,632.40 km) |
| Delaware to Cataño (Puerto Rico) | 1,814.23 mi (2,919.72 km) |
| Delaware to Cathedral City (California) | 1,882.20 mi (3,029.10 km) |
| Delaware to Catonsville (Maryland) | 343.46 mi (552.75 km) |
| Delaware to Cave Spring (Virginia) | 268.29 mi (431.76 km) |
| Delaware to Cayce (South Carolina) | 452.03 mi (727.47 km) |
| Delaware to Cayey (Puerto Rico) | 1,832.91 mi (2,949.79 km) |
| Delaware to Cedar City (Utah) | 1,614.59 mi (2,598.44 km) |
| Delaware to Cedar Falls (Iowa) | 509.70 mi (820.29 km) |
| Delaware to Cedar Hill (Texas) | 935.79 mi (1,506.01 km) |
| Delaware to Cedar Lake (Indiana) | 240.15 mi (386.49 km) |
| Delaware to Cedar Mill (Oregon) | 2,021.54 mi (3,253.35 km) |
