The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
| County | Wealth Index | |
|---|---|---|
| 1. | Adams County | 50 |
| 2. | Ferry County | 52 |
| 3. | Whitman County | 58 |
| 4. | Garfield County | 59 |
| 5. | Pend Oreille County | 60 |
| 6. | Stevens County | 61 |
| 7. | Grays Harbor County | 61 |
| 8. | Okanogan County | 63 |
| 9. | Klickitat County | 65 |
| 10. | Asotin County | 66 |
| 11. | Grant County | 67 |
| 12. | Douglas County | 67 |
| 13. | Kittitas County | 67 |
| 14. | Pacific County | 68 |
| 15. | Yakima County | 68 |
| 16. | Lincoln County | 74 |
| 17. | Walla Walla County | 75 |
| 18. | Lewis County | 78 |
| 19. | Columbia County | 79 |
| 20. | Franklin County | 80 |
