| Cwmbran to Silver Firs (Washington) | 4,679.75 mi (7,531.33 km) |
| Cwmbran to Silver Spring (Maryland) | 3,538.19 mi (5,694.16 km) |
| Cwmbran to Silver Springs Shores (Florida) | 4,213.60 mi (6,781.13 km) |
| Cwmbran to Silverdale (Washington) | 4,705.26 mi (7,572.38 km) |
| Cwmbran to Silverton (Oregon) | 4,858.32 mi (7,818.71 km) |
| Cwmbran to Simi Valley (California) | 5,344.36 mi (8,600.92 km) |
| Cwmbran to Simpsonville (South Carolina) | 3,950.66 mi (6,357.97 km) |
| Cwmbran to Sioux City (Iowa) | 4,132.24 mi (6,650.20 km) |
| Cwmbran to Sioux Falls (South Dakota) | 4,094.46 mi (6,589.40 km) |
| Cwmbran to Skokie (Illinois) | 3,829.15 mi (6,162.43 km) |
| Cwmbran to Sleepy Hollow (New York) | 3,317.88 mi (5,339.62 km) |
| Cwmbran to Slidell (Louisiana) | 4,477.10 mi (7,205.19 km) |
| Cwmbran to Smithfield (North Carolina) | 3,752.05 mi (6,038.34 km) |
| Cwmbran to Smithfield (Utah) | 4,700.58 mi (7,564.85 km) |
| Cwmbran to Smithville (Missouri) | 4,215.13 mi (6,783.60 km) |
