| Echelon to Security-Widefield (Colorado) | 1,583.49 mi (2,548.39 km) |
| Echelon to Sedalia (Missouri) | 976.95 mi (1,572.26 km) |
| Echelon to Sedro-Woolley (Washington) | 2,375.40 mi (3,822.84 km) |
| Echelon to Seguin (Texas) | 1,478.47 mi (2,379.37 km) |
| Echelon to Selden (New York) | 124.61 mi (200.54 km) |
| Echelon to Selma (Alabama) | 844.21 mi (1,358.62 km) |
| Echelon to Selma (California) | 2,407.81 mi (3,875.00 km) |
| Echelon to Selma (Texas) | 1,495.65 mi (2,407.01 km) |
| Echelon to Seminole (Florida) | 941.23 mi (1,514.76 km) |
| Echelon to Seven Hills (Ohio) | 365.79 mi (588.68 km) |
| Echelon to Seven Oaks (South Carolina) | 524.94 mi (844.82 km) |
| Echelon to Severn (Maryland) | 103.15 mi (166.00 km) |
| Echelon to Severna Park (Maryland) | 99.02 mi (159.36 km) |
| Echelon to Sevierville (Tennessee) | 541.40 mi (871.30 km) |
| Echelon to Seymour (Indiana) | 584.68 mi (940.95 km) |
