| Castle Rock to Rockville (Maryland) | 1,476.71 mi (2,376.54 km) |
| Castle Rock to Rockville Centre (New York) | 1,645.40 mi (2,648.02 km) |
| Castle Rock to Rockwall (Texas) | 647.25 mi (1,041.64 km) |
| Castle Rock to Rocky Mount (North Carolina) | 1,492.18 mi (2,401.44 km) |
| Castle Rock to Rocky Point (New York) | 1,679.54 mi (2,702.96 km) |
| Castle Rock to Rocky River (Ohio) | 1,214.82 mi (1,955.06 km) |
| Castle Rock to Roessleville (New York) | 1,625.44 mi (2,615.89 km) |
| Castle Rock to Rogers (Arkansas) | 620.42 mi (998.46 km) |
| Castle Rock to Rogers (Minnesota) | 701.35 mi (1,128.71 km) |
| Castle Rock to Rohnert Park (California) | 961.01 mi (1,546.60 km) |
| Castle Rock to Rolla (Missouri) | 712.61 mi (1,146.84 km) |
| Castle Rock to Rolling Meadows (Illinois) | 899.09 mi (1,446.94 km) |
| Castle Rock to Roma (Texas) | 956.94 mi (1,540.04 km) |
| Castle Rock to Rome (Georgia) | 1,140.90 mi (1,836.09 km) |
| Castle Rock to Rome (New York) | 1,538.95 mi (2,476.70 km) |
