| Castle Rock to Cadillac (Michigan) | 1,053.06 mi (1,694.73 km) |
| Castle Rock to Caguas (Puerto Rico) | 2,735.88 mi (4,402.97 km) |
| Castle Rock to Cahokia (Illinois) | 789.38 mi (1,270.39 km) |
| Castle Rock to Calabasas (California) | 844.86 mi (1,359.67 km) |
| Castle Rock to Caldwell (Idaho) | 677.46 mi (1,090.27 km) |
| Castle Rock to Caledonia (Wisconsin) | 913.41 mi (1,470.00 km) |
| Castle Rock to Calera (Alabama) | 1,094.98 mi (1,762.21 km) |
| Castle Rock to Calexico (California) | 752.24 mi (1,210.62 km) |
| Castle Rock to Calhoun (Georgia) | 1,147.71 mi (1,847.07 km) |
| Castle Rock to California (Maryland) | 1,521.79 mi (2,449.09 km) |
| Castle Rock to California City (California) | 771.97 mi (1,242.37 km) |
| Castle Rock to Callaway (Florida) | 1,263.94 mi (2,034.11 km) |
| Castle Rock to Calumet City (Illinois) | 920.57 mi (1,481.52 km) |
| Castle Rock to Calverton (Maryland) | 1,487.93 mi (2,394.59 km) |
| Castle Rock to Camano (Washington) | 1,065.01 mi (1,713.96 km) |
