California Gazetteer
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.
| County | Wealth Index | |
|---|---|---|
| 1. | Marin County | 227 |
| 2. | San Mateo County | 209 |
| 3. | Santa Clara County | 197 |
| 4. | Contra Costa County | 174 |
| 5. | El Dorado County | 163 |
| 6. | Placer County | 154 |
| 7. | Alpine County | 152 |
| 8. | Alameda County | 151 |
| 9. | Napa County | 149 |
| 10. | Santa Cruz County | 148 |
| 11. | Ventura County | 146 |
| 12. | Nevada County | 145 |
| 13. | Orange County | 144 |
| 14. | San Francisco County | 142 |
| 15. | Sonoma County | 141 |
| 16. | San Benito County | 132 |
| 17. | Calaveras County | 130 |
| 18. | San Luis Obispo County | 130 |
| 19. | San Diego County | 129 |
| 20. | Santa Barbara County | 121 |
