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. | Town of Hunts Point | King | 452 |
| 2. | Town of Yarrow Point | King | 441 |
| 3. | City of Clyde Hill | King | 429 |
| 4. | City of Medina | King | 415 |
| 5. | Town of Beaux Arts Village | King | 404 |
| 6. | Riverpoint Census Designated Place | King | 317 |
| 7. | Cottage Lake Census Designated Place | King | 316 |
| 8. | City of Mercer Island | King | 304 |
| 9. | City of Sammamish | King | 300 |
| 10. | City of Woodway | Snohomish | 291 |
| 11. | Union Hill-Novelty Hill Census Designated Place | King | 286 |
| 12. | Ames Lake Census Designated Place | King | 285 |
| 13. | Mirrormont Census Designated Place | King | 267 |
| 14. | City of Snoqualmie | King | 266 |
| 15. | Fox Island Census Designated Place | Pierce | 265 |
| 16. | Canterwood Census Designated Place | Pierce | 255 |
| 17. | Raft Island Census Designated Place | Pierce | 253 |
| 18. | Lake Roesiger Census Designated Place | Snohomish | 250 |
| 19. | City of Bainbridge Island | Kitsap | 247 |
| 20. | High Bridge Census Designated Place | Snohomish | 246 |