| Allentown to Smyrna (Delaware) | 90.27 mi (145.28 km) |
| Allentown to Smyrna (Georgia) | 680.32 mi (1,094.86 km) |
| Allentown to Smyrna (Tennessee) | 678.57 mi (1,092.05 km) |
| Allentown to Snellville (Georgia) | 660.42 mi (1,062.84 km) |
| Allentown to Snoqualmie (Washington) | 2,315.40 mi (3,726.27 km) |
| Allentown to Snyder (Texas) | 1,504.79 mi (2,421.72 km) |
| Allentown to Socastee (South Carolina) | 515.38 mi (829.42 km) |
| Allentown to Socorro (Texas) | 1,815.11 mi (2,921.13 km) |
| Allentown to Soddy-Daisy (Tennessee) | 643.92 mi (1,036.29 km) |
| Allentown to Solana Beach (California) | 2,347.66 mi (3,778.20 km) |
| Allentown to Soledad (California) | 2,468.00 mi (3,971.86 km) |
| Allentown to Solon (Ohio) | 315.75 mi (508.15 km) |
| Allentown to Somers Point (New Jersey) | 99.66 mi (160.39 km) |
| Allentown to Somerset (Kentucky) | 547.89 mi (881.75 km) |
| Allentown to Somerset (New Jersey) | 51.52 mi (82.92 km) |
