South Dakota counties ranked by the diversity index, the chance that two public school students picked at random from the county belong to different racial or ethnic groups. Counties need at least 3 schools and 1,000 students to qualify. The median ranked county is at 30.4%.
| # | County | State | Diversity index |
|---|---|---|---|
| 1 | Beadle County | SD | 66.2% |
| 2 | Moody County | SD | 65.1% |
| 3 | Roberts County | SD | 61.1% |
| 4 | Charles Mix County | SD | 60.0% |
| 5 | Pennington County | SD | 59.1% |
| 6 | Minnehaha County | SD | 56.8% |
| 7 | Hughes County | SD | 55.5% |
| 8 | Brule County | SD | 53.2% |
| 9 | Brown County | SD | 42.8% |
| 10 | Yankton County | SD | 39.4% |
| 11 | Davison County | SD | 36.3% |
| 12 | Brookings County | SD | 34.5% |
| 13 | Grant County | SD | 33.6% |
| 14 | Codington County | SD | 31.1% |
| 15 | Union County | SD | 30.7% |
| 16 | Lincoln County | SD | 30.1% |
| 17 | Lawrence County | SD | 26.7% |
| 18 | Meade County | SD | 26.6% |
| 19 | Butte County | SD | 25.9% |
| 20 | Lake County | SD | 23.1% |
| 21 | Dewey County | SD | 22.2% |
| 22 | Kingsbury County | SD | 21.0% |
| 23 | Bon Homme County | SD | 19.7% |
| 24 | Hutchinson County | SD | 19.5% |
| 25 | Hamlin County | SD | 18.3% |
| 26 | Turner County | SD | 18.1% |
| 27 | Spink County | SD | 18.0% |
| 28 | McCook County | SD | 15.0% |
| 29 | Todd County | SD | 9.1% |
| 30 | Oglala Lakota County | SD | 3.9% |