| Castle Rock to Somersworth (New Hampshire) | 1,770.58 mi (2,849.48 km) |
| Castle Rock to Somerton (Arizona) | 721.79 mi (1,161.61 km) |
| Castle Rock to Somerville (Massachusetts) | 1,763.68 mi (2,838.37 km) |
| Castle Rock to Somerville (New Jersey) | 1,595.67 mi (2,567.99 km) |
| Castle Rock to Sonoma (California) | 949.06 mi (1,527.37 km) |
| Castle Rock to Soquel (California) | 941.31 mi (1,514.90 km) |
| Castle Rock to South Bend (Indiana) | 986.85 mi (1,588.18 km) |
| Castle Rock to South Bradenton (Florida) | 1,518.97 mi (2,444.54 km) |
| Castle Rock to South Burlington (Vermont) | 1,652.90 mi (2,660.09 km) |
| Castle Rock to South Charleston (West Virginia) | 1,243.52 mi (2,001.24 km) |
| Castle Rock to South Daytona (Florida) | 1,526.92 mi (2,457.33 km) |
| Castle Rock to South El Monte (California) | 817.14 mi (1,315.06 km) |
| Castle Rock to South Elgin (Illinois) | 883.74 mi (1,422.25 km) |
| Castle Rock to South Euclid (Ohio) | 1,231.74 mi (1,982.29 km) |
| Castle Rock to South Farmingdale (New York) | 1,654.87 mi (2,663.26 km) |
