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. | Blaine County | 1.7 |
| 2. | Keya Paha County | 2.5 |
| 3. | Rock County | 3.6 |
| 4. | Hooker County | 4.4 |
| 5. | Garfield County | 4.6 |
| 6. | McPherson County | 4.6 |
| 7. | Wheeler County | 4.7 |
| 8. | Grant County | 5.1 |
| 9. | Loup County | 6.2 |
| 10. | Logan County | 7.4 |
| 11. | Sherman County | 7.4 |
| 12. | Thomas County | 7.8 |
| 13. | Thayer County | 7.9 |
| 14. | Frontier County | 8.1 |
| 15. | Boone County | 8.9 |
| 16. | Brown County | 9.2 |
| 17. | Cedar County | 9.4 |
| 18. | Pawnee County | 9.6 |
| 19. | Harlan County | 9.8 |
| 20. | Franklin County | 10.1 |
