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. | Keweenaw County | 5.0 |
| 2. | Alcona County | 8.9 |
| 3. | Montmorency County | 9.1 |
| 4. | Ontonagon County | 9.8 |
| 5. | Alpena County | 9.8 |
| 6. | Oscoda County | 9.8 |
| 7. | Presque Isle County | 9.9 |
| 8. | Gladwin County | 10.2 |
| 9. | Huron County | 11.2 |
| 10. | Crawford County | 11.4 |
| 11. | Dickinson County | 11.4 |
| 12. | Otsego County | 11.5 |
| 13. | Clare County | 12.0 |
| 14. | Arenac County | 12.3 |
| 15. | Osceola County | 12.3 |
| 16. | Wexford County | 12.6 |
| 17. | Roscommon County | 12.7 |
| 18. | Antrim County | 12.7 |
| 19. | Hillsdale County | 12.8 |
| 20. | Ogemaw County | 13.0 |
