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. | Cook County | 110 |
| 2. | Lake County | 120 |
| 3. | Jackson County | 125 |
| 4. | DeKalb County | 128 |
| 5. | Kane County | 133 |
| 6. | DuPage County | 135 |
| 7. | Champaign County | 137 |
| 8. | Kankakee County | 142 |
| 9. | McHenry County | 146 |
| 10. | Will County | 149 |
| 11. | Kendall County | 154 |
| 12. | McLean County | 155 |
| 13. | Monroe County | 159 |
| 14. | Peoria County | 159 |
| 15. | Jo Daviess County | 162 |
| 16. | Boone County | 163 |
| 17. | Tazewell County | 167 |
| 18. | Williamson County | 168 |
| 19. | Winnebago County | 169 |
| 20. | St. Clair County | 170 |
