| Echelon to Smyrna (Delaware) | 50.33 mi (81.00 km) |
| Echelon to Smyrna (Georgia) | 668.70 mi (1,076.17 km) |
| Echelon to Smyrna (Tennessee) | 682.67 mi (1,098.65 km) |
| Echelon to Snellville (Georgia) | 647.03 mi (1,041.30 km) |
| Echelon to Snoqualmie (Washington) | 2,362.16 mi (3,801.52 km) |
| Echelon to Snyder (Texas) | 1,518.87 mi (2,444.39 km) |
| Echelon to Socastee (South Carolina) | 480.01 mi (772.50 km) |
| Echelon to Socorro (Texas) | 1,831.89 mi (2,948.14 km) |
| Echelon to Soddy-Daisy (Tennessee) | 640.86 mi (1,031.36 km) |
| Echelon to Solana Beach (California) | 2,374.21 mi (3,820.92 km) |
| Echelon to Soledad (California) | 2,501.21 mi (4,025.31 km) |
| Echelon to Solon (Ohio) | 354.20 mi (570.03 km) |
| Echelon to Somers Point (New Jersey) | 42.17 mi (67.86 km) |
| Echelon to Somerset (Kentucky) | 553.78 mi (891.22 km) |
| Echelon to Somerset (New Jersey) | 52.56 mi (84.58 km) |
