| Castle Rock to Carrollwood (Florida) | 1,496.91 mi (2,409.04 km) |
| Castle Rock to Carson (California) | 834.86 mi (1,343.58 km) |
| Castle Rock to Carson City (Nevada) | 796.01 mi (1,281.05 km) |
| Castle Rock to Carteret (New Jersey) | 1,615.38 mi (2,599.70 km) |
| Castle Rock to Cartersville (Georgia) | 1,163.88 mi (1,873.09 km) |
| Castle Rock to Carthage (Missouri) | 591.25 mi (951.53 km) |
| Castle Rock to Cary (Illinois) | 888.81 mi (1,430.40 km) |
| Castle Rock to Cary (North Carolina) | 1,441.83 mi (2,320.40 km) |
| Castle Rock to Casa de Oro-Mount Helix (California) | 815.24 mi (1,312.01 km) |
| Castle Rock to Casa Grande (Arizona) | 589.86 mi (949.29 km) |
| Castle Rock to Casas Adobes (Arizona) | 595.55 mi (958.44 km) |
| Castle Rock to Cascades (Virginia) | 1,464.87 mi (2,357.47 km) |
| Castle Rock to Casper (Wyoming) | 251.33 mi (404.48 km) |
| Castle Rock to Casselberry (Florida) | 1,530.82 mi (2,463.62 km) |
| Castle Rock to Castaic (California) | 831.57 mi (1,338.28 km) |
