The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
| County | Diversity Index | |
|---|---|---|
| 1. | Hanson County | 3.9 |
| 2. | Faulk County | 4.1 |
| 3. | Hand County | 6.3 |
| 4. | Sanborn County | 6.5 |
| 5. | McPherson County | 7.4 |
| 6. | Campbell County | 8.0 |
| 7. | Edmunds County | 9.3 |
| 8. | Perkins County | 9.5 |
| 9. | Potter County | 10.3 |
| 10. | Kingsbury County | 11.0 |
| 11. | Spink County | 11.2 |
| 12. | Sully County | 11.7 |
| 13. | Douglas County | 11.7 |
| 14. | Clark County | 13.9 |
| 15. | Deuel County | 14.1 |
| 16. | Miner County | 14.2 |
| 17. | Turner County | 14.3 |
| 18. | McCook County | 15.0 |
| 19. | Harding County | 15.1 |
| 20. | Hutchinson County | 16.4 |
