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. | Vernon County | 9.2 |
| 2. | Florence County | 9.3 |
| 3. | Pepin County | 9.7 |
| 4. | Iron County | 10.7 |
| 5. | Iowa County | 11.4 |
| 6. | Rusk County | 11.6 |
| 7. | Lincoln County | 11.8 |
| 8. | Buffalo County | 11.8 |
| 9. | Grant County | 11.9 |
| 10. | Marinette County | 12.0 |
| 11. | Oneida County | 12.2 |
| 12. | Taylor County | 12.3 |
| 13. | Oconto County | 12.5 |
| 14. | Polk County | 12.6 |
| 15. | Richland County | 12.7 |
| 16. | Langlade County | 13.0 |
| 17. | Crawford County | 13.5 |
| 18. | Pierce County | 13.6 |
| 19. | Washburn County | 13.7 |
| 20. | St. Croix County | 14.5 |
