| Keystone to Somersworth (New Hampshire) | 1,231.61 mi (1,982.09 km) |
| Keystone to Somerton (Arizona) | 1,930.92 mi (3,107.52 km) |
| Keystone to Somerville (Massachusetts) | 1,177.12 mi (1,894.39 km) |
| Keystone to Somerville (New Jersey) | 971.74 mi (1,563.87 km) |
| Keystone to Sonoma (California) | 2,388.28 mi (3,843.57 km) |
| Keystone to Soquel (California) | 2,353.78 mi (3,788.05 km) |
| Keystone to South Bend (Indiana) | 958.46 mi (1,542.50 km) |
| Keystone to South Bradenton (Florida) | 46.31 mi (74.52 km) |
| Keystone to South Burlington (Vermont) | 1,241.35 mi (1,997.76 km) |
| Keystone to South Charleston (West Virginia) | 707.38 mi (1,138.41 km) |
| Keystone to South Daytona (Florida) | 120.23 mi (193.49 km) |
| Keystone to South El Monte (California) | 2,125.99 mi (3,421.45 km) |
| Keystone to South Elgin (Illinois) | 1,010.00 mi (1,625.44 km) |
| Keystone to South Euclid (Ohio) | 927.34 mi (1,492.41 km) |
| Keystone to South Farmingdale (New York) | 1,012.68 mi (1,629.76 km) |
