| Mountain Ash to Silver Firs (Washington) | 4,668.49 mi (7,513.21 km) |
| Mountain Ash to Silver Spring (Maryland) | 3,522.91 mi (5,669.58 km) |
| Mountain Ash to Silver Springs Shores (Florida) | 4,198.16 mi (6,756.28 km) |
| Mountain Ash to Silverdale (Washington) | 4,694.03 mi (7,554.32 km) |
| Mountain Ash to Silverton (Oregon) | 4,846.80 mi (7,800.17 km) |
| Mountain Ash to Simi Valley (California) | 5,331.36 mi (8,580.00 km) |
| Mountain Ash to Simpsonville (South Carolina) | 3,935.36 mi (6,333.35 km) |
| Mountain Ash to Sioux City (Iowa) | 4,118.13 mi (6,627.49 km) |
| Mountain Ash to Sioux Falls (South Dakota) | 4,080.47 mi (6,566.88 km) |
| Mountain Ash to Skokie (Illinois) | 3,814.49 mi (6,138.83 km) |
| Mountain Ash to Sleepy Hollow (New York) | 3,302.61 mi (5,315.04 km) |
| Mountain Ash to Slidell (Louisiana) | 4,461.87 mi (7,180.69 km) |
| Mountain Ash to Smithfield (North Carolina) | 3,736.68 mi (6,013.61 km) |
| Mountain Ash to Smithfield (Utah) | 4,687.61 mi (7,543.98 km) |
| Mountain Ash to Smithville (Missouri) | 4,200.64 mi (6,760.28 km) |
