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 Atherton | San Mateo | 576 |
| 2. | City of Rolling Hills | Los Angeles | 571 |
| 3. | Town of Hillsborough | San Mateo | 569 |
| 4. | Town of Los Altos Hills | Santa Clara | 559 |
| 5. | Loyola Census Designated Place | Santa Clara | 539 |
| 6. | Town of Woodside | San Mateo | 532 |
| 7. | Ladera Census Designated Place | San Mateo | 526 |
| 8. | City of Piedmont | Alameda | 516 |
| 9. | Town of Portola Valley | San Mateo | 511 |
| 10. | City of Monte Sereno | Santa Clara | 507 |
| 11. | Town of Ross | Marin | 495 |
| 12. | City of Hidden Hills | Los Angeles | 490 |
| 13. | City of Belvedere | Marin | 480 |
| 14. | Emerald Lake Hills Census Designated Place | San Mateo | 478 |
| 15. | City of Los Altos | Santa Clara | 470 |
| 16. | Sleepy Hollow Census Designated Place | Marin | 470 |
| 17. | North Gate Census Designated Place | Contra Costa | 468 |
| 18. | City of Palos Verdes Estates | Los Angeles | 467 |
| 19. | Alamo Census Designated Place | Contra Costa | 461 |
| 20. | City of Saratoga | Santa Clara | 460 |
