| Fort Madison to Superior (Colorado) | 728.65 mi (1,172.65 km) |
| Fort Madison to Superior (Wisconsin) | 421.22 mi (677.88 km) |
| Fort Madison to Surprise (Arizona) | 1,253.02 mi (2,016.54 km) |
| Fort Madison to Susanville (California) | 1,529.85 mi (2,462.05 km) |
| Fort Madison to Sussex (Wisconsin) | 236.75 mi (381.02 km) |
| Fort Madison to Suwanee (Georgia) | 604.60 mi (973.01 km) |
| Fort Madison to Swansea (Illinois) | 160.43 mi (258.19 km) |
| Fort Madison to Sweetwater (Florida) | 1,203.63 mi (1,937.05 km) |
| Fort Madison to Sweetwater (Texas) | 754.13 mi (1,213.66 km) |
| Fort Madison to Sycamore (Illinois) | 167.95 mi (270.29 km) |
| Fort Madison to Sylacauga (Alabama) | 585.86 mi (942.85 km) |
| Fort Madison to Sylvania (Ohio) | 404.40 mi (650.81 km) |
| Fort Madison to Syosset (New York) | 933.18 mi (1,501.82 km) |
| Fort Madison to Syracuse (New York) | 799.37 mi (1,286.46 km) |
| Fort Madison to Syracuse (Utah) | 1,080.72 mi (1,739.26 km) |
