| Keystone to Silver Firs (Washington) | 2,508.71 mi (4,037.37 km) |
| Keystone to Silver Spring (Maryland) | 816.49 mi (1,314.02 km) |
| Keystone to Silver Springs Shores (Florida) | 76.53 mi (123.16 km) |
| Keystone to Silverdale (Washington) | 2,528.01 mi (4,068.43 km) |
| Keystone to Silverton (Oregon) | 2,482.03 mi (3,994.44 km) |
| Keystone to Simi Valley (California) | 2,166.37 mi (3,486.43 km) |
| Keystone to Simpsonville (South Carolina) | 456.29 mi (734.33 km) |
| Keystone to Sioux City (Iowa) | 1,257.23 mi (2,023.31 km) |
| Keystone to Sioux Falls (South Dakota) | 1,322.55 mi (2,128.44 km) |
| Keystone to Skokie (Illinois) | 1,003.20 mi (1,614.49 km) |
| Keystone to Sleepy Hollow (New York) | 1,022.61 mi (1,645.73 km) |
| Keystone to Slidell (Louisiana) | 458.00 mi (737.08 km) |
| Keystone to Smithfield (North Carolina) | 567.65 mi (913.54 km) |
| Keystone to Smithfield (Utah) | 1,892.53 mi (3,045.74 km) |
| Keystone to Smithville (Missouri) | 1,036.52 mi (1,668.12 km) |
