California Gazetteer
| Name | County | Average Household Income | |
|---|---|---|---|
| 1. | City of Hidden Hills | Los Angeles | $343,483 |
| 2. | City of Piedmont | Alameda | $340,837 |
| 3. | Town of Hillsborough | San Mateo | $334,990 |
| 4. | Town of Atherton | San Mateo | $331,311 |
| 5. | Castle Hill Census Designated Place | Contra Costa | $330,374 |
| 6. | Town of Los Altos Hills | Santa Clara | $327,683 |
| 7. | North Gate Census Designated Place | Contra Costa | $327,527 |
| 8. | Emerald Lake Hills Census Designated Place | San Mateo | $326,715 |
| 9. | Bell Canyon Census Designated Place | Ventura | $325,743 |
| 10. | Norris Canyon Census Designated Place | Contra Costa | $324,351 |
| 11. | Town of Portola Valley | San Mateo | $323,102 |
| 12. | City of Monte Sereno | Santa Clara | $322,279 |
| 13. | City of Los Altos | Santa Clara | $321,665 |
| 14. | Glen Ellen Census Designated Place | Sonoma | $321,632 |
| 15. | Loyola Census Designated Place | Santa Clara | $319,229 |
| 16. | Alamo Census Designated Place | Contra Costa | $318,725 |
| 17. | City of Orinda | Contra Costa | $318,541 |
| 18. | Town of Woodside | San Mateo | $317,195 |
| 19. | Town of Ross | Marin | $314,668 |
| 20. | La Honda Census Designated Place | San Mateo | $313,873 |
