| Castle Rock to Candler-McAfee (Georgia) | 1,203.95 mi (1,937.58 km) |
| Castle Rock to Caño Martin Peña (Puerto Rico) | 2,726.37 mi (4,387.66 km) |
| Castle Rock to Cañon City (Colorado) | 67.43 mi (108.52 km) |
| Castle Rock to Canóvanas (Puerto Rico) | 2,736.61 mi (4,404.14 km) |
| Castle Rock to Canton (Georgia) | 1,177.89 mi (1,895.63 km) |
| Castle Rock to Canton (Illinois) | 787.69 mi (1,267.66 km) |
| Castle Rock to Canton (Mississippi) | 950.06 mi (1,528.98 km) |
| Castle Rock to Canton (Ohio) | 1,241.60 mi (1,998.17 km) |
| Castle Rock to Canyon (Texas) | 343.31 mi (552.50 km) |
| Castle Rock to Canyon Lake (California) | 792.04 mi (1,274.67 km) |
| Castle Rock to Canyon Lake (Texas) | 755.32 mi (1,215.57 km) |
| Castle Rock to Cape Coral (Florida) | 1,582.54 mi (2,546.85 km) |
| Castle Rock to Cape Girardeau (Missouri) | 839.91 mi (1,351.70 km) |
| Castle Rock to Carbondale (Illinois) | 851.17 mi (1,369.83 km) |
| Castle Rock to Carlisle (Pennsylvania) | 1,463.17 mi (2,354.75 km) |
