| Castle Rock to Culpeper (Virginia) | 1,439.51 mi (2,316.66 km) |
| Castle Rock to Culver City (California) | 835.87 mi (1,345.20 km) |
| Castle Rock to Cumberland (Maryland) | 1,386.16 mi (2,230.81 km) |
| Castle Rock to Cupertino (California) | 940.98 mi (1,514.37 km) |
| Castle Rock to Cutler Bay (Florida) | 1,708.90 mi (2,750.22 km) |
| Castle Rock to Cutlerville (Michigan) | 1,024.33 mi (1,648.51 km) |
| Castle Rock to Cuyahoga Falls (Ohio) | 1,232.54 mi (1,983.57 km) |
| Castle Rock to Cypress (California) | 824.94 mi (1,327.61 km) |
| Castle Rock to Cypress Gardens (Florida) | 1,539.56 mi (2,477.68 km) |
| Castle Rock to Cypress Lake (Florida) | 1,591.73 mi (2,561.64 km) |
| Castle Rock to D'Iberville (Mississippi) | 1,090.64 mi (1,755.22 km) |
| Castle Rock to Dakota Ridge (Colorado) | 22.49 mi (36.20 km) |
| Castle Rock to Dale City (Virginia) | 1,471.93 mi (2,368.84 km) |
| Castle Rock to Dallas (Georgia) | 1,168.82 mi (1,881.04 km) |
| Castle Rock to Dallas (Oregon) | 1,017.39 mi (1,637.33 km) |
