| Castle Rock to San Luis Obispo (California) | 912.75 mi (1,468.94 km) |
| Castle Rock to San Marcos (California) | 809.53 mi (1,302.81 km) |
| Castle Rock to San Marcos (Texas) | 764.78 mi (1,230.79 km) |
| Castle Rock to San Marino (California) | 817.79 mi (1,316.10 km) |
| Castle Rock to San Mateo (California) | 951.36 mi (1,531.06 km) |
| Castle Rock to San Pablo (California) | 947.00 mi (1,524.05 km) |
| Castle Rock to San Rafael (California) | 956.21 mi (1,538.87 km) |
| Castle Rock to San Ramon (California) | 928.14 mi (1,493.69 km) |
| Castle Rock to San Tan Valley (Arizona) | 568.00 mi (914.11 km) |
| Castle Rock to Sand Springs (Oklahoma) | 526.30 mi (846.99 km) |
| Castle Rock to Sandusky (Ohio) | 1,170.83 mi (1,884.26 km) |
| Castle Rock to Sandy (Oregon) | 978.66 mi (1,575.01 km) |
| Castle Rock to Sandy (Utah) | 379.46 mi (610.68 km) |
| Castle Rock to Sandy Springs (Georgia) | 1,192.81 mi (1,919.64 km) |
| Castle Rock to Sanford (Florida) | 1,528.09 mi (2,459.23 km) |
