Towns
| State | City/Town | Town Title |
|---|---|---|
| South Dakota | Rockham | Rockham, SD |
| South Dakota | Roscoe | Roscoe, SD |
| South Dakota | Rosebud | Rosebud, SD |
| South Dakota | Rosholt | Rosholt, SD |
| South Dakota | Roslyn | Roslyn, SD |
| South Dakota | Rowena | Rowena, SD |
| South Dakota | Rutland | Rutland, SD |
| South Dakota | Saint Charles | Saint Charles, SD |
| South Dakota | Saint Francis | Saint Francis, SD |
| South Dakota | Saint Lawrence | Saint Lawrence, SD |
| South Dakota | Saint Onge | Saint Onge, SD |
| South Dakota | Salem | Salem, SD |
| South Dakota | Scenic | Scenic, SD |
| South Dakota | Scotland | Scotland, SD |
| South Dakota | Selby | Selby, SD |
| South Dakota | Seneca | Seneca, SD |
| South Dakota | Sinai | Sinai, SD |
| South Dakota | Sioux Falls | Sioux Falls, SD |
| South Dakota | Sisseton | Sisseton, SD |
| South Dakota | Smithwick | Smithwick, SD |
| South Dakota | South Shore | South Shore, SD |
| South Dakota | Spearfish | Spearfish, SD |
| South Dakota | Spencer | Spencer, SD |
| South Dakota | Springfield | Springfield, SD |
| South Dakota | Stephan | Stephan, SD |