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.
| Name | County | Wealth Index | |
|---|---|---|---|
| 1. | Buena Census Designated Place | Yakima | 27 |
| 2. | Whidbey Island Station Census Designated Place | Island | 29 |
| 3. | City of Royal City | Grant | 30 |
| 4. | Moses Lake North Census Designated Place | Grant | 30 |
| 5. | Malott Census Designated Place | Okanogan | 31 |
| 6. | Town of Nespelem | Okanogan | 31 |
| 7. | City of Soap Lake | Grant | 31 |
| 8. | Bangor Base Census Designated Place | Kitsap | 33 |
| 9. | City of Clarkston | Asotin | 34 |
| 10. | Fort Lewis Census Designated Place | Pierce | 34 |
| 11. | Grayland Census Designated Place | Grays Harbor | 35 |
| 12. | Amanda Park Census Designated Place | Grays Harbor | 35 |
| 13. | City of Bridgeport | Douglas | 35 |
| 14. | Taholah Census Designated Place | Grays Harbor | 35 |
| 15. | City of Wapato | Yakima | 36 |
| 16. | City of Ellensburg | Kittitas | 36 |
| 17. | City of Goldendale | Klickitat | 37 |
| 18. | Inchelium Census Designated Place | Ferry | 37 |
| 19. | Keller Census Designated Place | Ferry | 37 |
| 20. | City of Chewelah | Stevens | 37 |
