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.
| ZIP Code | City | Housing Affordability Index | |
|---|---|---|---|
| 1. | 66113 | Edwardsville | 350 |
| 2. | 67623 | Alton | 350 |
| 3. | 67831 | Ashland | 303 |
| 4. | 67523 | Burdett | 298 |
| 5. | 66958 | Morrowville | 289 |
| 6. | 67572 | Ransom | 284 |
| 7. | 66944 | Haddam | 283 |
| 8. | 67651 | Natoma | 280 |
| 9. | 67418 | Barnard | 277 |
| 10. | 67349 | Howard | 273 |
| 11. | 67584 | Utica | 273 |
| 12. | 67657 | Palco | 273 |
| 13. | 67529 | Garfield | 270 |
| 14. | 66940 | Cuba | 269 |
| 15. | 66942 | Formoso | 267 |
| 16. | 67954 | Rolla | 264 |
| 17. | 67524 | Chase | 255 |
| 18. | 67574 | Rozel | 252 |
| 19. | 67547 | Kinsley | 247 |
| 20. | 66966 | Scandia | 245 |