California Gazetteer
| Name | County | Average Household Income | |
|---|---|---|---|
| 1. | Town of Hillsborough | San Mateo | $357,458 |
| 2. | Town of Atherton | San Mateo | $354,663 |
| 3. | Town of Los Altos Hills | Santa Clara | $354,326 |
| 4. | City of Monte Sereno | Santa Clara | $354,164 |
| 5. | City of Hidden Hills | Los Angeles | $353,699 |
| 6. | City of Piedmont | Alameda | $352,753 |
| 7. | North Gate Census Designated Place | Contra Costa | $348,819 |
| 8. | City of Los Altos | Santa Clara | $339,640 |
| 9. | Loyola Census Designated Place | Santa Clara | $337,819 |
| 10. | Emerald Lake Hills Census Designated Place | San Mateo | $337,223 |
| 11. | Town of Woodside | San Mateo | $336,824 |
| 12. | City of Orinda | Contra Costa | $333,127 |
| 13. | Bell Canyon Census Designated Place | Ventura | $332,999 |
| 14. | City of Rolling Hills | Los Angeles | $328,695 |
| 15. | Alamo Census Designated Place | Contra Costa | $327,866 |
| 16. | Town of Ross | Marin | $324,728 |
| 17. | Town of Portola Valley | San Mateo | $321,402 |
| 18. | City of Saratoga | Santa Clara | $314,937 |
| 19. | West Menlo Park Census Designated Place | San Mateo | $308,425 |
| 20. | Lake Sherwood Census Designated Place | Ventura | $307,598 |
