| Castle Rock to Romeoville (Illinois) | 892.38 mi (1,436.14 km) |
| Castle Rock to Romulus (Michigan) | 1,137.80 mi (1,831.11 km) |
| Castle Rock to Ronkonkoma (New York) | 1,670.89 mi (2,689.04 km) |
| Castle Rock to Roosevelt (New York) | 1,648.11 mi (2,652.37 km) |
| Castle Rock to Rosamond (California) | 798.36 mi (1,284.83 km) |
| Castle Rock to Rosaryville (Maryland) | 1,497.93 mi (2,410.68 km) |
| Castle Rock to Roscoe (Illinois) | 852.48 mi (1,371.94 km) |
| Castle Rock to Rose Hill (Virginia) | 1,482.75 mi (2,386.25 km) |
| Castle Rock to Roseburg (Oregon) | 993.98 mi (1,599.66 km) |
| Castle Rock to Rosedale (California) | 833.61 mi (1,341.57 km) |
| Castle Rock to Rosedale (Maryland) | 1,508.13 mi (2,427.10 km) |
| Castle Rock to Roselle (Illinois) | 895.28 mi (1,440.82 km) |
| Castle Rock to Roselle (New Jersey) | 1,613.16 mi (2,596.14 km) |
| Castle Rock to Roselle Park (New Jersey) | 1,612.71 mi (2,595.41 km) |
| Castle Rock to Rosemead (California) | 818.13 mi (1,316.65 km) |
