| Castle Rock to Cicero (Illinois) | 911.10 mi (1,466.27 km) |
| Castle Rock to Cimarron Hills (Colorado) | 36.64 mi (58.96 km) |
| Castle Rock to Cincinnati (Ohio) | 1,086.38 mi (1,748.35 km) |
| Castle Rock to Cinco Ranch (Texas) | 842.22 mi (1,355.42 km) |
| Castle Rock to Circleville (Ohio) | 1,166.00 mi (1,876.49 km) |
| Castle Rock to Citrus (California) | 806.95 mi (1,298.66 km) |
| Castle Rock to Citrus Heights (California) | 882.05 mi (1,419.53 km) |
| Castle Rock to Citrus Park (Florida) | 1,493.94 mi (2,404.27 km) |
| Castle Rock to Claiborne (Louisiana) | 849.69 mi (1,367.45 km) |
| Castle Rock to Claremont (California) | 798.05 mi (1,284.33 km) |
| Castle Rock to Claremont (New Hampshire) | 1,697.33 mi (2,731.59 km) |
| Castle Rock to Claremore (Oklahoma) | 546.58 mi (879.64 km) |
| Castle Rock to Clarksburg (Maryland) | 1,469.27 mi (2,364.56 km) |
| Castle Rock to Clarksburg (West Virginia) | 1,306.93 mi (2,103.30 km) |
| Castle Rock to Clarksdale (Mississippi) | 866.44 mi (1,394.40 km) |
