| Castle Rock to Commerce City (Colorado) | 33.71 mi (54.25 km) |
| Castle Rock to Compton (California) | 831.48 mi (1,338.14 km) |
| Castle Rock to Comstock Park (Michigan) | 1,025.92 mi (1,651.06 km) |
| Castle Rock to Concord (California) | 928.66 mi (1,494.53 km) |
| Castle Rock to Concord (Missouri) | 780.44 mi (1,255.99 km) |
| Castle Rock to Concord (New Hampshire) | 1,736.79 mi (2,795.09 km) |
| Castle Rock to Concord (North Carolina) | 1,353.34 mi (2,177.99 km) |
| Castle Rock to Conneaut (Ohio) | 1,280.78 mi (2,061.22 km) |
| Castle Rock to Connersville (Indiana) | 1,048.76 mi (1,687.81 km) |
| Castle Rock to Conroe (Texas) | 819.69 mi (1,319.17 km) |
| Castle Rock to Converse (Texas) | 776.53 mi (1,249.71 km) |
| Castle Rock to Conway (Arkansas) | 742.48 mi (1,194.90 km) |
| Castle Rock to Conway (Florida) | 1,536.93 mi (2,473.45 km) |
| Castle Rock to Conway (South Carolina) | 1,476.11 mi (2,375.57 km) |
| Castle Rock to Conyers (Georgia) | 1,220.14 mi (1,963.62 km) |
