| Castle Rock to Ridgeland (Mississippi) | 951.18 mi (1,530.77 km) |
| Castle Rock to Ridgewood (New Jersey) | 1,618.20 mi (2,604.24 km) |
| Castle Rock to Rifle (Colorado) | 156.13 mi (251.26 km) |
| Castle Rock to Rincon (Georgia) | 1,405.45 mi (2,261.86 km) |
| Castle Rock to Ringwood (New Jersey) | 1,608.89 mi (2,589.26 km) |
| Castle Rock to Río Grande (Puerto Rico) | 2,739.28 mi (4,408.45 km) |
| Castle Rock to Rio Grande City (Texas) | 963.08 mi (1,549.92 km) |
| Castle Rock to Rio Linda (California) | 890.33 mi (1,432.85 km) |
| Castle Rock to Rio Rancho (New Mexico) | 300.13 mi (483.01 km) |
| Castle Rock to Rio Rico (Arizona) | 644.39 mi (1,037.05 km) |
| Castle Rock to Ripon (California) | 885.44 mi (1,424.98 km) |
| Castle Rock to River Edge (New Jersey) | 1,622.46 mi (2,611.09 km) |
| Castle Rock to River Falls (Wisconsin) | 731.22 mi (1,176.79 km) |
| Castle Rock to River Forest (Illinois) | 908.34 mi (1,461.82 km) |
| Castle Rock to River Grove (Illinois) | 907.58 mi (1,460.61 km) |
