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. | City of Hardin | Big Horn | 72.4 |
| 2. | Evaro Census Designated Place | Missoula | 65.7 |
| 3. | City of Ronan | Lake | 65.6 |
| 4. | Pablo Census Designated Place | Lake | 64.0 |
| 5. | Town of Saint Ignatius | Lake | 63.4 |
| 6. | Arlee Census Designated Place | Lake | 63.1 |
| 7. | Town of West Yellowstone | Gallatin | 60.3 |
| 8. | City of Harlem | Blaine | 59.9 |
| 9. | Fort Smith Census Designated Place | Big Horn | 59.5 |
| 10. | Dixon Census Designated Place | Sanders | 59.5 |
| 11. | Malmstrom Air Force Base Census Designated Place | Cascade | 59.5 |
| 12. | City of Wolf Point | Roosevelt | 58.0 |
| 13. | Frazer Census Designated Place | Valley | 57.8 |
| 14. | City of Polson | Lake | 53.5 |
| 15. | Elmo Census Designated Place | Lake | 53.2 |
| 16. | Big Arm Census Designated Place | Lake | 52.9 |
| 17. | Lindisfarne Census Designated Place | Lake | 52.8 |
| 18. | Turtle Lake Census Designated Place | Lake | 52.4 |
| 19. | Ashland Census Designated Place | Rosebud | 52.2 |
| 20. | West Havre Census Designated Place | Hill | 52.0 |
