| Rapid City to Silver Firs (Washington) | 943.33 mi (1,518.15 km) |
| Rapid City to Silver Spring (Maryland) | 1,393.01 mi (2,241.83 km) |
| Rapid City to Silver Springs Shores (Florida) | 1,557.40 mi (2,506.40 km) |
| Rapid City to Silverdale (Washington) | 965.84 mi (1,554.37 km) |
| Rapid City to Silverton (Oregon) | 963.13 mi (1,550.01 km) |
| Rapid City to Simi Valley (California) | 1,069.65 mi (1,721.44 km) |
| Rapid City to Simpsonville (South Carolina) | 1,286.61 mi (2,070.60 km) |
| Rapid City to Sioux City (Iowa) | 360.26 mi (579.78 km) |
| Rapid City to Sioux Falls (South Dakota) | 325.58 mi (523.97 km) |
| Rapid City to Skokie (Illinois) | 792.88 mi (1,276.01 km) |
| Rapid City to Sleepy Hollow (New York) | 1,499.07 mi (2,412.52 km) |
| Rapid City to Slidell (Louisiana) | 1,202.48 mi (1,935.20 km) |
| Rapid City to Smithfield (North Carolina) | 1,439.35 mi (2,316.41 km) |
| Rapid City to Smithfield (Utah) | 461.56 mi (742.81 km) |
| Rapid City to Smithville (Missouri) | 550.21 mi (885.48 km) |
