| Allentown to Security-Widefield (Colorado) | 1,553.03 mi (2,499.35 km) |
| Allentown to Sedalia (Missouri) | 952.03 mi (1,532.15 km) |
| Allentown to Sedro-Woolley (Washington) | 2,327.62 mi (3,745.93 km) |
| Allentown to Seguin (Texas) | 1,475.10 mi (2,373.95 km) |
| Allentown to Selden (New York) | 128.58 mi (206.93 km) |
| Allentown to Selma (Alabama) | 853.86 mi (1,374.15 km) |
| Allentown to Selma (California) | 2,375.11 mi (3,822.37 km) |
| Allentown to Selma (Texas) | 1,491.81 mi (2,400.83 km) |
| Allentown to Seminole (Florida) | 974.12 mi (1,567.70 km) |
| Allentown to Seven Hills (Ohio) | 327.69 mi (527.37 km) |
| Allentown to Seven Oaks (South Carolina) | 548.99 mi (883.52 km) |
| Allentown to Severn (Maryland) | 119.87 mi (192.92 km) |
| Allentown to Severna Park (Maryland) | 119.31 mi (192.01 km) |
| Allentown to Sevierville (Tennessee) | 546.13 mi (878.91 km) |
| Allentown to Seymour (Indiana) | 564.36 mi (908.25 km) |
