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.
| Name | County | Diversity Index | |
|---|---|---|---|
| 1. | Town of Jordan | Garfield | 3.5 |
| 2. | Highwood Census Designated Place | Chouteau | 4.3 |
| 3. | Town of Winnett | Petroleum | 4.3 |
| 4. | Town of Richey | Dawson | 5.3 |
| 5. | Wilsall Census Designated Place | Park | 5.4 |
| 6. | Town of Winifred | Fergus | 5.9 |
| 7. | Town of Chester | Liberty | 6.0 |
| 8. | Town of Denton | Fergus | 6.1 |
| 9. | Town of Ekalaka | Carter | 6.4 |
| 10. | Town of Grass Range | Fergus | 6.4 |
| 11. | Town of Geraldine | Chouteau | 6.5 |
| 12. | Roy Census Designated Place | Fergus | 6.5 |
| 13. | Maxville Census Designated Place | Granite | 7.1 |
| 14. | Town of Wibaux | Wibaux | 7.1 |
| 15. | City of Fort Benton | Chouteau | 7.1 |
| 16. | City of Hobson | Judith Basin | 7.1 |
| 17. | Rocky Boy's Agency Census Designated Place | Hill | 7.6 |
| 18. | Sedan Census Designated Place | Gallatin | 7.7 |
| 19. | Town of Stanford | Judith Basin | 7.8 |
| 20. | Saint Pierre Census Designated Place | Hill | 7.8 |
