| Castle Rock to Castle Pines (Colorado) | 6.03 mi (9.70 km) |
| Castle Rock to Castro Valley (California) | 935.66 mi (1,505.80 km) |
| Castle Rock to Catalina Foothills (Arizona) | 593.64 mi (955.37 km) |
| Castle Rock to Cataño (Puerto Rico) | 2,721.41 mi (4,379.69 km) |
| Castle Rock to Cathedral City (California) | 748.25 mi (1,204.19 km) |
| Castle Rock to Catonsville (Maryland) | 1,496.47 mi (2,408.33 km) |
| Castle Rock to Cave Spring (Virginia) | 1,351.09 mi (2,174.37 km) |
| Castle Rock to Cayce (South Carolina) | 1,367.45 mi (2,200.70 km) |
| Castle Rock to Cayey (Puerto Rico) | 2,734.94 mi (4,401.47 km) |
| Castle Rock to Cedar City (Utah) | 460.40 mi (740.94 km) |
| Castle Rock to Cedar Falls (Iowa) | 681.81 mi (1,097.27 km) |
| Castle Rock to Cedar Hill (Texas) | 643.87 mi (1,036.22 km) |
| Castle Rock to Cedar Lake (Indiana) | 925.35 mi (1,489.20 km) |
| Castle Rock to Cedar Mill (Oregon) | 1,006.06 mi (1,619.10 km) |
| Castle Rock to Cedar Park (Texas) | 730.13 mi (1,175.03 km) |
