| Radford to Silver Firs (Washington) | 2,214.15 mi (3,563.32 km) |
| Radford to Silver Spring (Maryland) | 232.16 mi (373.63 km) |
| Radford to Silver Springs Shores (Florida) | 559.81 mi (900.93 km) |
| Radford to Silverdale (Washington) | 2,237.98 mi (3,601.69 km) |
| Radford to Silverton (Oregon) | 2,238.96 mi (3,603.25 km) |
| Radford to Simi Valley (California) | 2,137.66 mi (3,440.23 km) |
| Radford to Simpsonville (South Carolina) | 190.76 mi (307.00 km) |
| Radford to Sioux City (Iowa) | 916.75 mi (1,475.36 km) |
| Radford to Sioux Falls (South Dakota) | 957.98 mi (1,541.72 km) |
| Radford to Skokie (Illinois) | 511.01 mi (822.39 km) |
| Radford to Sleepy Hollow (New York) | 451.18 mi (726.11 km) |
| Radford to Slidell (Louisiana) | 709.30 mi (1,141.50 km) |
| Radford to Smithfield (North Carolina) | 165.80 mi (266.84 km) |
| Radford to Smithfield (Utah) | 1,689.25 mi (2,718.59 km) |
| Radford to Smithville (Missouri) | 775.57 mi (1,248.16 km) |
