| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ideal | city | South Dakota | United States | 43.54333 | -99.92111 | 1899 | 75 |
| Igloo | city | South Dakota | United States | 43.2025 | -103.85639 | 3772 | 61 |
| Imlay | city | South Dakota | United States | 43.71944 | -102.39694 | 2604 | 105 |
| Imogene | city | South Dakota | United States | 45.14056 | -102.7125 | 2575 | 56 |
| Indian Hill Division | city | South Dakota | United States | 43.57139 | -96.62139 | 1450 | 6881 |
| Ingberg Tracts | city | South Dakota | United States | 43.55889 | -96.64583 | 1450 | 26335 |
| Interior | city | South Dakota | United States | 43.72694 | -101.98361 | 2388 | 71 |
| Iona | city | South Dakota | United States | 43.54306 | -99.42444 | 1850 | 98 |
| Ipswich | city | South Dakota | United States | 45.44444 | -99.02889 | 1499 | 173 |
| Irene | city | South Dakota | United States | 43.08306 | -97.16028 | 1417 | 404 |
| Iron Lightning | city | South Dakota | United States | 45.17972 | -101.84583 | 2171 | 47 |
| Iroquois | city | South Dakota | United States | 44.36694 | -97.85056 | 1397 | 208 |
| Isabel | city | South Dakota | United States | 45.39417 | -101.42917 | 2398 | 88 |
| Ivanhoe historical | city | South Dakota | United States | 43.47917 | -103.69444 | 4366 | 88 |
| Iversons Subdivision | city | South Dakota | United States | 43.52833 | -96.63944 | 1496 | 29390 |
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