| Mortara to Silver Firs (Washington) | 5,350.88 mi (8,611.41 km) |
| Mortara to Silver Spring (Maryland) | 4,203.37 mi (6,764.67 km) |
| Mortara to Silver Springs Shores (Florida) | 4,856.34 mi (7,815.52 km) |
| Mortara to Silverdale (Washington) | 5,375.76 mi (8,651.44 km) |
| Mortara to Silverton (Oregon) | 5,533.45 mi (8,905.23 km) |
| Mortara to Simi Valley (California) | 6,037.49 mi (9,716.40 km) |
| Mortara to Simpsonville (South Carolina) | 4,613.38 mi (7,424.52 km) |
| Mortara to Sioux City (Iowa) | 4,827.42 mi (7,768.99 km) |
| Mortara to Sioux Falls (South Dakota) | 4,790.20 mi (7,709.07 km) |
| Mortara to Skokie (Illinois) | 4,518.03 mi (7,271.06 km) |
| Mortara to Sleepy Hollow (New York) | 3,983.98 mi (6,411.59 km) |
| Mortara to Slidell (Louisiana) | 5,144.37 mi (8,279.07 km) |
| Mortara to Smithfield (North Carolina) | 4,408.01 mi (7,094.00 km) |
| Mortara to Smithfield (Utah) | 5,393.55 mi (8,680.08 km) |
| Mortara to Smithville (Missouri) | 4,906.73 mi (7,896.61 km) |
