| Fort Madison to San Luis Obispo (California) | 1,631.63 mi (2,625.85 km) |
| Fort Madison to San Marcos (California) | 1,511.34 mi (2,432.26 km) |
| Fort Madison to San Marcos (Texas) | 829.69 mi (1,335.26 km) |
| Fort Madison to San Marino (California) | 1,529.72 mi (2,461.84 km) |
| Fort Madison to San Mateo (California) | 1,665.24 mi (2,679.95 km) |
| Fort Madison to San Pablo (California) | 1,658.75 mi (2,669.49 km) |
| Fort Madison to San Rafael (California) | 1,667.61 mi (2,683.76 km) |
| Fort Madison to San Ramon (California) | 1,641.38 mi (2,641.55 km) |
| Fort Madison to San Tan Valley (Arizona) | 1,225.63 mi (1,972.46 km) |
| Fort Madison to Sand Springs (Oklahoma) | 403.60 mi (649.53 km) |
| Fort Madison to Sandusky (Ohio) | 454.15 mi (730.89 km) |
| Fort Madison to Sandy (Oregon) | 1,586.28 mi (2,552.87 km) |
| Fort Madison to Sandy (Utah) | 1,073.05 mi (1,726.91 km) |
| Fort Madison to Sandy Springs (Georgia) | 600.04 mi (965.66 km) |
| Fort Madison to Sanford (Florida) | 996.33 mi (1,603.44 km) |
