Montana Gazetteer
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. | Rosebud County | 58.5 |
| 2. | Roosevelt County | 57.4 |
| 3. | Blaine County | 57.4 |
| 4. | Lake County | 54.1 |
| 5. | Big Horn County | 53.1 |
| 6. | Hill County | 52.0 |
| 7. | Glacier County | 51.6 |
| 8. | Chouteau County | 46.6 |
| 9. | Cascade County | 38.3 |
| 10. | Pondera County | 38.0 |
| 11. | Yellowstone County | 37.5 |
| 12. | Phillips County | 35.0 |
| 13. | Toole County | 34.0 |
| 14. | Missoula County | 33.0 |
| 15. | Valley County | 32.6 |
| 16. | Richland County | 32.1 |
| 17. | Gallatin County | 30.0 |
| 18. | Sanders County | 29.2 |
| 19. | Powell County | 29.1 |
| 20. | Lewis and Clark County | 28.2 |
