| Alton to Smyrna (Delaware) | 3,561.60 mi (5,731.84 km) |
| Alton to Smyrna (Georgia) | 4,179.54 mi (6,726.32 km) |
| Alton to Smyrna (Tennessee) | 4,160.16 mi (6,695.13 km) |
| Alton to Snellville (Georgia) | 4,158.78 mi (6,692.91 km) |
| Alton to Snoqualmie (Washington) | 4,772.53 mi (7,680.64 km) |
| Alton to Snyder (Texas) | 4,887.78 mi (7,866.11 km) |
| Alton to Socastee (South Carolina) | 3,959.25 mi (6,371.79 km) |
| Alton to Socorro (Texas) | 5,145.37 mi (8,280.67 km) |
| Alton to Soddy-Daisy (Tennessee) | 4,139.46 mi (6,661.81 km) |
| Alton to Solana Beach (California) | 5,457.01 mi (8,782.22 km) |
| Alton to Soledad (California) | 5,390.83 mi (8,675.71 km) |
| Alton to Solon (Ohio) | 3,706.15 mi (5,964.47 km) |
| Alton to Somers Point (New Jersey) | 3,519.15 mi (5,663.52 km) |
| Alton to Somerset (Kentucky) | 4,029.97 mi (6,485.61 km) |
| Alton to Somerset (New Jersey) | 3,463.21 mi (5,573.50 km) |
