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. | Garfield County | 24.4 |
| 2. | Lincoln County | 26.5 |
| 3. | Pend Oreille County | 27.9 |
| 4. | Asotin County | 27.9 |
| 5. | Wahkiakum County | 29.6 |
| 6. | Jefferson County | 31.3 |
| 7. | Stevens County | 33.7 |
| 8. | Columbia County | 36.1 |
| 9. | Skamania County | 36.5 |
| 10. | San Juan County | 37.3 |
| 11. | Spokane County | 41.6 |
| 12. | Clallam County | 42.5 |
| 13. | Cowlitz County | 45.5 |
| 14. | Pacific County | 45.5 |
| 15. | Kittitas County | 45.8 |
| 16. | Lewis County | 46.0 |
| 17. | Island County | 48.6 |
| 18. | Ferry County | 49.3 |
| 19. | Klickitat County | 50.8 |
| 20. | Grays Harbor County | 51.1 |
