| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sugar Creek (historical) | city | Iowa | United States | 40.41 | -91.51 | 830 | |
| Sully | city | Iowa | United States | 41.58 | -92.84 | 961 | |
| Sulphur Springs | city | Iowa | United States | 42.62 | -95.10 | 1669 | |
| Summerset | city | Iowa | United States | 41.43 | -93.54 | 898 | |
| Summerset Junction (historical) | city | Iowa | United States | 41.44 | -93.54 | 830 | |
| Summit | city | Iowa | United States | 40.83 | -95.42 | 1069 | |
| Summit | city | Iowa | United States | 41.92 | -91.63 | 846 | |
| Summit | city | Iowa | United States | 41.51 | -91.02 | 830 | |
| Summit (historical) | city | Iowa | United States | 40.67 | -91.34 | 830 | |
| Summit View Mobile Home Park | city | Iowa | United States | 41.95 | -91.73 | 849 | |
| Summit Village Dyersville Park | city | Iowa | United States | 42.48 | -91.12 | 1000 | |
| Summitville | city | Iowa | United States | 40.47 | -91.45 | 830 | |
| Sumner | city | Iowa | United States | 42.85 | -92.09 | 1072 | |
| Sunbury | city | Iowa | United States | 41.67 | -90.93 | 830 | |
| Sunfield Mobile Home Park | city | Iowa | United States | 41.37 | -93.55 | 938 | |
| Sunny-Brook Mobile Home Park | city | Iowa | United States | 41.67 | -93.55 | 882 | |
| Sunrise Mobile Court | city | Iowa | United States | 41.93 | -91.68 | 830 | |
| Sunrise Mobile Home Community | city | Iowa | United States | 41.72 | -93.03 | 944 | |
| Sunrise Mobile Home Park | city | Iowa | United States | 41.40 | -92.90 | 859 | |
| Sunrise Mobile Home Park | city | Iowa | United States | 43.08 | -96.16 | 1669 | |
| Sunrise Mobile Home Village | city | Iowa | United States | 41.64 | -91.48 | 830 | |
| Sunset Village | city | Iowa | United States | 42.05 | -91.68 | 830 | |
| Sunset Village | city | Iowa | United States | 42.00 | -95.37 | 1669 | |
| Sunset Village Mobile Home Park | city | Iowa | United States | 42.01 | -92.89 | 977 | |
| Sunshine | city | Iowa | United States | 40.74 | -92.93 | 1003 | |
| Superior | city | Iowa | United States | 43.43 | -94.95 | 1669 | |
| Sutherland | city | Iowa | United States | 42.97 | -95.50 | 1669 | |
| Sutliff | city | Iowa | United States | 41.84 | -91.39 | 830 |