| Population | 875 |
| Square Miles | 302.79 |
| Population Density | 2.89 |
| Median Age | 37 |
| Median Household Income | $31,053 |
| Per Capita Income | $13,582 |
| Median Rent | $270 |
| Percent Renters | 19% |
| Median Iroquois, SD 57353 For Sale Price: | $74,900 |
| 1 Bedroom For Sale Median Price: | $20,000 |
| 3 Bedroom For Sale Median Price: | $134,900 |
| 4 Bedroom For Sale Median Price: | $74,900 |