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. | Crook County | 11.0 |
| 2. | Niobrara County | 17.7 |
| 3. | Lincoln County | 19.3 |
| 4. | Hot Springs County | 19.4 |
| 5. | Sheridan County | 19.7 |
| 6. | Johnson County | 20.0 |
| 7. | Weston County | 20.5 |
| 8. | Park County | 20.8 |
| 9. | Platte County | 27.0 |
| 10. | Sublette County | 27.5 |
| 11. | Converse County | 27.9 |
| 12. | Big Horn County | 29.2 |
| 13. | Campbell County | 30.0 |
| 14. | Uinta County | 30.6 |
| 15. | Natrona County | 31.6 |
| 16. | Goshen County | 31.8 |
| 17. | Albany County | 37.6 |
| 18. | Washakie County | 39.5 |
| 19. | Teton County | 43.2 |
| 20. | Laramie County | 44.6 |
