| West Mifflin to Siloam Springs (Arkansas) | 842.82 mi (1,356.38 km) |
| West Mifflin to Silver Firs (Washington) | 2,130.32 mi (3,428.42 km) |
| West Mifflin to Silver Spring (Maryland) | 179.79 mi (289.34 km) |
| West Mifflin to Silver Springs Shores (Florida) | 786.08 mi (1,265.07 km) |
| West Mifflin to Silverdale (Washington) | 2,155.57 mi (3,469.06 km) |
| West Mifflin to Silverton (Oregon) | 2,175.37 mi (3,500.93 km) |
| West Mifflin to Simi Valley (California) | 2,157.70 mi (3,472.48 km) |
| West Mifflin to Simpsonville (South Carolina) | 409.65 mi (659.27 km) |
| West Mifflin to Sioux City (Iowa) | 865.15 mi (1,392.33 km) |
| West Mifflin to Sioux Falls (South Dakota) | 890.32 mi (1,432.84 km) |
| West Mifflin to Skokie (Illinois) | 423.22 mi (681.10 km) |
| West Mifflin to Sleepy Hollow (New York) | 320.00 mi (514.99 km) |
| West Mifflin to Slidell (Louisiana) | 889.78 mi (1,431.96 km) |
| West Mifflin to Smithfield (North Carolina) | 345.32 mi (555.74 km) |
| West Mifflin to Smithfield (Utah) | 1,655.56 mi (2,664.36 km) |
