The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
| County | Housing Affordability Index | |
|---|---|---|
| 1. | San Francisco County | 53 |
| 2. | Marin County | 61 |
| 3. | San Mateo County | 61 |
| 4. | Los Angeles County | 63 |
| 5. | Santa Cruz County | 64 |
| 6. | Santa Clara County | 66 |
| 7. | San Luis Obispo County | 68 |
| 8. | Monterey County | 68 |
| 9. | Alameda County | 71 |
| 10. | Santa Barbara County | 73 |
| 11. | Trinity County | 76 |
| 12. | Orange County | 76 |
| 13. | San Diego County | 76 |
| 14. | Sonoma County | 77 |
| 15. | Napa County | 78 |
| 16. | Mendocino County | 79 |
| 17. | Yolo County | 79 |
| 18. | Ventura County | 80 |
| 19. | San Benito County | 80 |
| 20. | Contra Costa County | 86 |
