| Rapid City to Somersworth (New Hampshire) | 1,606.77 mi (2,585.85 km) |
| Rapid City to Somerton (Arizona) | 1,005.46 mi (1,618.13 km) |
| Rapid City to Somerville (Massachusetts) | 1,610.80 mi (2,592.34 km) |
| Rapid City to Somerville (New Jersey) | 1,473.89 mi (2,371.99 km) |
| Rapid City to Sonoma (California) | 1,074.08 mi (1,728.56 km) |
| Rapid City to Soquel (California) | 1,094.73 mi (1,761.80 km) |
| Rapid City to South Bend (Indiana) | 872.46 mi (1,404.09 km) |
| Rapid City to South Bradenton (Florida) | 1,620.73 mi (2,608.32 km) |
| Rapid City to South Burlington (Vermont) | 1,476.20 mi (2,375.72 km) |
| Rapid City to South Charleston (West Virginia) | 1,181.71 mi (1,901.77 km) |
| Rapid City to South Daytona (Florida) | 1,596.47 mi (2,569.27 km) |
| Rapid City to South El Monte (California) | 1,051.74 mi (1,692.61 km) |
| Rapid City to South Elgin (Illinois) | 765.37 mi (1,231.75 km) |
| Rapid City to South Euclid (Ohio) | 1,110.59 mi (1,787.32 km) |
| Rapid City to South Farmingdale (New York) | 1,528.26 mi (2,459.50 km) |
