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. | Yakima County | 82.9 |
| 2. | Franklin County | 82.8 |
| 3. | Adams County | 81.2 |
| 4. | Grant County | 79.1 |
| 5. | Douglas County | 74.6 |
| 6. | King County | 70.4 |
| 7. | Chelan County | 68.9 |
| 8. | Okanogan County | 68.4 |
| 9. | Benton County | 67.0 |
| 10. | Pierce County | 65.3 |
| 11. | Walla Walla County | 64.7 |
| 12. | Snohomish County | 63.5 |
| 13. | Skagit County | 60.1 |
| 14. | Thurston County | 54.9 |
| 15. | Clark County | 54.3 |
| 16. | Kitsap County | 52.0 |
| 17. | Mason County | 51.6 |
| 18. | Whitman County | 50.3 |
| 19. | Whatcom County | 50.2 |
| 20. | Grays Harbor County | 49.8 |
