| Castle Rock to Roy (Utah) | 398.91 mi (641.98 km) |
| Castle Rock to Royal Kunia (Hawaii) | 3,349.77 mi (5,390.93 km) |
| Castle Rock to Royal Oak (Michigan) | 1,149.69 mi (1,850.24 km) |
| Castle Rock to Royal Palm Beach (Florida) | 1,665.33 mi (2,680.09 km) |
| Castle Rock to Royse City (Texas) | 649.18 mi (1,044.75 km) |
| Castle Rock to Ruskin (Florida) | 1,516.25 mi (2,440.17 km) |
| Castle Rock to Russellville (Alabama) | 1,001.88 mi (1,612.36 km) |
| Castle Rock to Russellville (Arkansas) | 702.52 mi (1,130.60 km) |
| Castle Rock to Ruston (Louisiana) | 829.72 mi (1,335.31 km) |
| Castle Rock to Rutherford (New Jersey) | 1,619.82 mi (2,606.84 km) |
| Castle Rock to Rutland (Vermont) | 1,664.80 mi (2,679.24 km) |
| Castle Rock to Sabana Grande (Puerto Rico) | 2,696.58 mi (4,339.73 km) |
| Castle Rock to Sachse (Texas) | 638.77 mi (1,028.00 km) |
| Castle Rock to Saco (Maine) | 1,790.82 mi (2,882.05 km) |
| Castle Rock to Sacramento (California) | 892.99 mi (1,437.13 km) |
