| Castle Rock to Rancho Cordova (California) | 881.41 mi (1,418.49 km) |
| Castle Rock to Rancho Cucamonga (California) | 790.80 mi (1,272.66 km) |
| Castle Rock to Rancho Mirage (California) | 749.32 mi (1,205.91 km) |
| Castle Rock to Rancho Palos Verdes (California) | 843.08 mi (1,356.80 km) |
| Castle Rock to Rancho San Diego (California) | 813.05 mi (1,308.48 km) |
| Castle Rock to Rancho Santa Margarita (California) | 810.40 mi (1,304.21 km) |
| Castle Rock to Randallstown (Maryland) | 1,492.12 mi (2,401.33 km) |
| Castle Rock to Rantoul (Illinois) | 886.90 mi (1,427.32 km) |
| Castle Rock to Rapid City (South Dakota) | 335.15 mi (539.37 km) |
| Castle Rock to Ravenna (Ohio) | 1,247.02 mi (2,006.88 km) |
| Castle Rock to Raymondville (Texas) | 980.42 mi (1,577.84 km) |
| Castle Rock to Raymore (Missouri) | 558.56 mi (898.92 km) |
| Castle Rock to Raytown (Missouri) | 556.72 mi (895.95 km) |
| Castle Rock to Reading (Ohio) | 1,089.52 mi (1,753.42 km) |
| Castle Rock to Reading (Pennsylvania) | 1,528.84 mi (2,460.43 km) |
