| Castle Rock to Superior (Colorado) | 41.82 mi (67.30 km) |
| Castle Rock to Superior (Wisconsin) | 817.80 mi (1,316.12 km) |
| Castle Rock to Surprise (Arizona) | 576.45 mi (927.70 km) |
| Castle Rock to Susanville (California) | 837.37 mi (1,347.61 km) |
| Castle Rock to Sussex (Wisconsin) | 900.28 mi (1,448.86 km) |
| Castle Rock to Suwanee (Georgia) | 1,205.38 mi (1,939.86 km) |
| Castle Rock to Swansea (Illinois) | 799.87 mi (1,287.26 km) |
| Castle Rock to Sweetwater (Florida) | 1,698.04 mi (2,732.73 km) |
| Castle Rock to Sweetwater (Texas) | 537.95 mi (865.74 km) |
| Castle Rock to Sycamore (Illinois) | 864.98 mi (1,392.04 km) |
| Castle Rock to Sylacauga (Alabama) | 1,117.99 mi (1,799.23 km) |
| Castle Rock to Sylvania (Ohio) | 1,118.94 mi (1,800.75 km) |
| Castle Rock to Syosset (New York) | 1,651.20 mi (2,657.35 km) |
| Castle Rock to Syracuse (New York) | 1,506.06 mi (2,423.78 km) |
| Castle Rock to Syracuse (Utah) | 398.42 mi (641.19 km) |
