| Fort Madison to Somersworth (New Hampshire) | 1,064.68 mi (1,713.44 km) |
| Fort Madison to Somerton (Arizona) | 1,402.97 mi (2,257.86 km) |
| Fort Madison to Somerville (Massachusetts) | 1,052.36 mi (1,693.60 km) |
| Fort Madison to Somerville (New Jersey) | 877.02 mi (1,411.43 km) |
| Fort Madison to Sonoma (California) | 1,658.72 mi (2,669.46 km) |
| Fort Madison to Soquel (California) | 1,657.75 mi (2,667.89 km) |
| Fort Madison to South Bend (Indiana) | 274.20 mi (441.29 km) |
| Fort Madison to South Bradenton (Florida) | 1,037.28 mi (1,669.35 km) |
| Fort Madison to South Burlington (Vermont) | 958.10 mi (1,541.91 km) |
| Fort Madison to South Charleston (West Virginia) | 537.07 mi (864.34 km) |
| Fort Madison to South Daytona (Florida) | 983.37 mi (1,582.59 km) |
| Fort Madison to South El Monte (California) | 1,528.49 mi (2,459.87 km) |
| Fort Madison to South Elgin (Illinois) | 183.86 mi (295.90 km) |
| Fort Madison to South Euclid (Ohio) | 515.34 mi (829.36 km) |
| Fort Madison to South Farmingdale (New York) | 936.66 mi (1,507.40 km) |
