Towns
| State | City/Town | Town Title |
|---|---|---|
| Iowa | Sully | Sully, IA |
| Iowa | Sumner | Sumner, IA |
| Iowa | Superior | Superior, IA |
| Iowa | Sutherland | Sutherland, IA |
| Iowa | Swaledale | Swaledale, IA |
| Iowa | Swan | Swan, IA |
| Iowa | Swea City | Swea City, IA |
| Iowa | Swedesburg | Swedesburg, IA |
| Iowa | Swisher | Swisher, IA |
| Iowa | Tabor | Tabor, IA |
| Iowa | Tama | Tama, IA |
| Iowa | Teeds Grove | Teeds Grove, IA |
| Iowa | Templeton | Templeton, IA |
| Iowa | Terril | Terril, IA |
| Iowa | Thayer | Thayer, IA |
| Iowa | Thompson | Thompson, IA |
| Iowa | Thor | Thor, IA |
| Iowa | Thornburg | Thornburg, IA |
| Iowa | Thornton | Thornton, IA |
| Iowa | Thurman | Thurman, IA |
| Iowa | Tiffin | Tiffin, IA |
| Iowa | Tingley | Tingley, IA |
| Iowa | Tipton | Tipton, IA |
| Iowa | Titonka | Titonka, IA |
| Iowa | Toddville | Toddville, IA |