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. | Clark County | 76.8 |
| 2. | Power County | 74.0 |
| 3. | Jerome County | 69.9 |
| 4. | Minidoka County | 68.2 |
| 5. | Lincoln County | 66.1 |
| 6. | Owyhee County | 64.7 |
| 7. | Gooding County | 64.4 |
| 8. | Cassia County | 63.1 |
| 9. | Canyon County | 60.0 |
| 10. | Blaine County | 57.3 |
| 11. | Bingham County | 56.2 |
| 12. | Elmore County | 55.7 |
| 13. | Twin Falls County | 48.3 |
| 14. | Teton County | 47.8 |
| 15. | Washington County | 47.8 |
| 16. | Payette County | 47.4 |
| 17. | Bonneville County | 40.7 |
| 18. | Fremont County | 37.8 |
| 19. | Bannock County | 36.8 |
| 20. | Jefferson County | 35.1 |
