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. | Billings County | 4.3 |
| 2. | Griggs County | 5.6 |
| 3. | Wells County | 5.6 |
| 4. | Emmons County | 6.0 |
| 5. | Logan County | 7.0 |
| 6. | Grant County | 7.2 |
| 7. | LaMoure County | 7.9 |
| 8. | Slope County | 9.1 |
| 9. | Foster County | 9.4 |
| 10. | Renville County | 9.5 |
| 11. | Cavalier County | 9.9 |
| 12. | Burke County | 10.3 |
| 13. | Divide County | 10.5 |
| 14. | McHenry County | 10.8 |
| 15. | McIntosh County | 10.8 |
| 16. | Hettinger County | 11.3 |
| 17. | Sheridan County | 11.4 |
| 18. | Ransom County | 11.4 |
| 19. | Steele County | 12.2 |
| 20. | Towner County | 12.4 |
