Washington 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. | Lincoln County | 19.8 |
| 2. | Asotin County | 23.6 |
| 3. | Jefferson County | 24.9 |
| 4. | Pend Oreille County | 25.4 |
| 5. | Wahkiakum County | 26.9 |
| 6. | Stevens County | 28.4 |
| 7. | Skamania County | 28.5 |
| 8. | San Juan County | 29.1 |
| 9. | Garfield County | 29.5 |
| 10. | Columbia County | 32.6 |
| 11. | Spokane County | 33.8 |
| 12. | Kittitas County | 36.5 |
| 13. | Clallam County | 37.1 |
| 14. | Cowlitz County | 38.6 |
| 15. | Lewis County | 39.7 |
| 16. | Klickitat County | 41.1 |
| 17. | Whitman County | 41.5 |
| 18. | Pacific County | 41.8 |
| 19. | Island County | 43.1 |
| 20. | Mason County | 44.8 |
