| Fort Madison to Smyrna (Delaware) | 837.65 mi (1,348.06 km) |
| Fort Madison to Smyrna (Georgia) | 598.98 mi (963.97 km) |
| Fort Madison to Smyrna (Tennessee) | 414.28 mi (666.73 km) |
| Fort Madison to Snellville (Georgia) | 617.39 mi (993.60 km) |
| Fort Madison to Snoqualmie (Washington) | 1,575.29 mi (2,535.19 km) |
| Fort Madison to Snyder (Texas) | 760.15 mi (1,223.35 km) |
| Fort Madison to Socastee (South Carolina) | 830.22 mi (1,336.11 km) |
| Fort Madison to Socorro (Texas) | 1,035.55 mi (1,666.56 km) |
| Fort Madison to Soddy-Daisy (Tennessee) | 500.36 mi (805.25 km) |
| Fort Madison to Solana Beach (California) | 1,520.10 mi (2,446.37 km) |
| Fort Madison to Soledad (California) | 1,638.30 mi (2,636.60 km) |
| Fort Madison to Solon (Ohio) | 519.19 mi (835.56 km) |
| Fort Madison to Somers Point (New Jersey) | 889.86 mi (1,432.10 km) |
| Fort Madison to Somerset (Kentucky) | 437.12 mi (703.48 km) |
| Fort Madison to Somerset (New Jersey) | 883.10 mi (1,421.22 km) |
