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 Yarrow Point | King | 550 |
| 2. | City of Clyde Hill | King | 525 |
| 3. | Town of Hunts Point | King | 521 |
| 4. | City of Medina | King | 501 |
| 5. | City of Woodway | Snohomish | 452 |
| 6. | Town of Beaux Arts Village | King | 432 |
| 7. | Raft Island Census Designated Place | Pierce | 359 |
| 8. | City of Mercer Island | King | 352 |
| 9. | Cottage Lake Census Designated Place | King | 351 |
| 10. | Lake Marcel-Stillwater Census Designated Place | King | 329 |
| 11. | Canterwood Census Designated Place | Pierce | 328 |
| 12. | Ames Lake Census Designated Place | King | 305 |
| 13. | Union Hill-Novelty Hill Census Designated Place | King | 297 |
| 14. | Fox Island Census Designated Place | Pierce | 296 |
| 15. | City of Bainbridge Island | Kitsap | 292 |
| 16. | Maple Heights-Lake Desire Census Designated Place | King | 285 |
| 17. | City of Sammamish | King | 284 |
| 18. | Lake Holm Census Designated Place | King | 282 |
| 19. | High Bridge Census Designated Place | Snohomish | 268 |
| 20. | Tanner Census Designated Place (historical) | King | 268 |
