| Bargoed to Silver Firs (Washington) | 4,671.82 mi (7,518.57 km) |
| Bargoed to Silver Spring (Maryland) | 3,528.46 mi (5,678.51 km) |
| Bargoed to Silver Springs Shores (Florida) | 4,203.90 mi (6,765.52 km) |
| Bargoed to Silverdale (Washington) | 4,697.35 mi (7,559.65 km) |
| Bargoed to Silverton (Oregon) | 4,850.25 mi (7,805.73 km) |
| Bargoed to Simi Valley (California) | 5,335.54 mi (8,586.73 km) |
| Bargoed to Simpsonville (South Carolina) | 3,940.93 mi (6,342.32 km) |
| Bargoed to Sioux City (Iowa) | 4,122.91 mi (6,635.18 km) |
| Bargoed to Sioux Falls (South Dakota) | 4,085.18 mi (6,574.46 km) |
| Bargoed to Skokie (Illinois) | 3,819.60 mi (6,147.05 km) |
| Bargoed to Sleepy Hollow (New York) | 3,308.16 mi (5,323.97 km) |
| Bargoed to Slidell (Louisiana) | 4,467.38 mi (7,189.55 km) |
| Bargoed to Smithfield (North Carolina) | 3,742.33 mi (6,022.70 km) |
| Bargoed to Smithfield (Utah) | 4,691.77 mi (7,550.68 km) |
| Bargoed to Smithville (Missouri) | 4,205.64 mi (6,768.33 km) |
