| Keystone to Superior (Colorado) | 1,520.75 mi (2,447.41 km) |
| Keystone to Superior (Wisconsin) | 1,381.67 mi (2,223.58 km) |
| Keystone to Surprise (Arizona) | 1,804.08 mi (2,903.39 km) |
| Keystone to Susanville (California) | 2,309.03 mi (3,716.02 km) |
| Keystone to Sussex (Wisconsin) | 1,082.97 mi (1,742.88 km) |
| Keystone to Suwanee (Georgia) | 418.12 mi (672.90 km) |
| Keystone to Swansea (Illinois) | 835.95 mi (1,345.32 km) |
| Keystone to Sweetwater (Florida) | 212.55 mi (342.07 km) |
| Keystone to Sweetwater (Texas) | 1,102.33 mi (1,774.03 km) |
| Keystone to Sycamore (Illinois) | 1,017.10 mi (1,636.87 km) |
| Keystone to Sylacauga (Alabama) | 410.93 mi (661.33 km) |
| Keystone to Sylvania (Ohio) | 940.28 mi (1,513.24 km) |
| Keystone to Syosset (New York) | 1,016.76 mi (1,636.32 km) |
| Keystone to Syracuse (New York) | 1,091.27 mi (1,756.23 km) |
| Keystone to Syracuse (Utah) | 1,886.86 mi (3,036.60 km) |
