| Castle Rock to Rosemont (California) | 887.16 mi (1,427.74 km) |
| Castle Rock to Rosemount (Minnesota) | 708.37 mi (1,140.01 km) |
| Castle Rock to Rosenberg (Texas) | 851.07 mi (1,369.66 km) |
| Castle Rock to Roseville (California) | 883.01 mi (1,421.06 km) |
| Castle Rock to Roseville (Michigan) | 1,160.71 mi (1,867.99 km) |
| Castle Rock to Roseville (Minnesota) | 713.35 mi (1,148.02 km) |
| Castle Rock to Rossmoor (California) | 828.01 mi (1,332.55 km) |
| Castle Rock to Rossville (Maryland) | 1,509.46 mi (2,429.25 km) |
| Castle Rock to Roswell (Georgia) | 1,190.90 mi (1,916.58 km) |
| Castle Rock to Roswell (New Mexico) | 415.18 mi (668.17 km) |
| Castle Rock to Round Lake (Illinois) | 897.24 mi (1,443.97 km) |
| Castle Rock to Round Lake Beach (Illinois) | 898.82 mi (1,446.52 km) |
| Castle Rock to Round Rock (Texas) | 733.98 mi (1,181.22 km) |
| Castle Rock to Rowland Heights (California) | 812.17 mi (1,307.06 km) |
| Castle Rock to Rowlett (Texas) | 642.84 mi (1,034.55 km) |
