| Keystone to Storm Lake (Iowa) | 1,225.28 mi (1,971.89 km) |
| Keystone to Storrs (Connecticut) | 1,109.94 mi (1,786.28 km) |
| Keystone to Stoughton (Wisconsin) | 1,086.87 mi (1,749.14 km) |
| Keystone to Stow (Ohio) | 903.75 mi (1,454.44 km) |
| Keystone to Streamwood (Illinois) | 1,009.57 mi (1,624.75 km) |
| Keystone to Streator (Illinois) | 964.39 mi (1,552.04 km) |
| Keystone to Streetsboro (Ohio) | 908.47 mi (1,462.04 km) |
| Keystone to Strongsville (Ohio) | 911.79 mi (1,467.39 km) |
| Keystone to Stuart (Florida) | 157.96 mi (254.22 km) |
| Keystone to Stuarts Draft (Virginia) | 713.49 mi (1,148.25 km) |
| Keystone to Sturgis (Michigan) | 957.59 mi (1,541.10 km) |
| Keystone to Suamico (Wisconsin) | 1,179.48 mi (1,898.18 km) |
| Keystone to Sudley (Virginia) | 792.52 mi (1,275.44 km) |
| Keystone to Suffern (New York) | 1,016.53 mi (1,635.95 km) |
| Keystone to Suffolk (Virginia) | 685.90 mi (1,103.85 km) |
