| Castle Rock to Cookeville (Tennessee) | 1,077.59 mi (1,734.21 km) |
| Castle Rock to Coolidge (Arizona) | 579.73 mi (932.99 km) |
| Castle Rock to Coon Rapids (Minnesota) | 712.24 mi (1,146.23 km) |
| Castle Rock to Cooper City (Florida) | 1,690.61 mi (2,720.78 km) |
| Castle Rock to Coos Bay (Oregon) | 1,039.42 mi (1,672.78 km) |
| Castle Rock to Copiague (New York) | 1,658.14 mi (2,668.52 km) |
| Castle Rock to Coppell (Texas) | 622.92 mi (1,002.49 km) |
| Castle Rock to Copperas Cove (Texas) | 691.43 mi (1,112.76 km) |
| Castle Rock to Coral Gables (Florida) | 1,706.34 mi (2,746.10 km) |
| Castle Rock to Coral Springs (Florida) | 1,682.21 mi (2,707.25 km) |
| Castle Rock to Coral Terrace (Florida) | 1,702.86 mi (2,740.49 km) |
| Castle Rock to Coralville (Iowa) | 713.58 mi (1,148.39 km) |
| Castle Rock to Coram (New York) | 1,676.39 mi (2,697.89 km) |
| Castle Rock to Corcoran (California) | 834.19 mi (1,342.51 km) |
| Castle Rock to Cordele (Georgia) | 1,285.75 mi (2,069.21 km) |
