| Pontneddfechan to Silver Firs (Washington) | 4,658.86 mi (7,497.71 km) |
| Pontneddfechan to Silver Spring (Maryland) | 3,512.91 mi (5,653.48 km) |
| Pontneddfechan to Silver Springs Shores (Florida) | 4,188.42 mi (6,740.62 km) |
| Pontneddfechan to Silverdale (Washington) | 4,684.42 mi (7,538.84 km) |
| Pontneddfechan to Silverton (Oregon) | 4,837.09 mi (7,784.54 km) |
| Pontneddfechan to Simi Valley (California) | 5,321.23 mi (8,563.70 km) |
| Pontneddfechan to Simpsonville (South Carolina) | 3,925.38 mi (6,317.29 km) |
| Pontneddfechan to Sioux City (Iowa) | 4,107.84 mi (6,610.94 km) |
| Pontneddfechan to Sioux Falls (South Dakota) | 4,070.19 mi (6,550.34 km) |
| Pontneddfechan to Skokie (Illinois) | 3,804.23 mi (6,122.31 km) |
| Pontneddfechan to Sleepy Hollow (New York) | 3,292.60 mi (5,298.93 km) |
| Pontneddfechan to Slidell (Louisiana) | 4,451.82 mi (7,164.52 km) |
| Pontneddfechan to Smithfield (North Carolina) | 3,726.79 mi (5,997.69 km) |
| Pontneddfechan to Smithfield (Utah) | 4,677.49 mi (7,527.69 km) |
| Pontneddfechan to Smithville (Missouri) | 4,190.36 mi (6,743.73 km) |
