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. | Garfield County | 181 |
| 2. | Lincoln County | 173 |
| 3. | Adams County | 152 |
| 4. | Grant County | 146 |
| 5. | Pacific County | 143 |
| 6. | Okanogan County | 142 |
| 7. | Grays Harbor County | 137 |
| 8. | Franklin County | 137 |
| 9. | Lewis County | 135 |
| 10. | Benton County | 133 |
| 11. | Yakima County | 133 |
| 12. | Wahkiakum County | 130 |
| 13. | Ferry County | 121 |
| 14. | Thurston County | 121 |
| 15. | Mason County | 118 |
| 16. | Cowlitz County | 118 |
| 17. | Pierce County | 117 |
| 18. | Klickitat County | 116 |
| 19. | Clark County | 114 |
| 20. | Clallam County | 113 |
