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. | 57069 | Vermillion | 112 |
| 2. | 57738 | Fairburn | 127 |
| 3. | 57783 | Spearfish | 128 |
| 4. | 57730 | Custer | 131 |
| 5. | 57745 | Hill City | 131 |
| 6. | 57744 | Hermosa | 132 |
| 7. | 57270 | Veblen | 134 |
| 8. | 57722 | Buffalo Gap | 136 |
| 9. | 57701 | Rapid City | 140 |
| 10. | 57785 | Sturgis | 140 |
| 11. | 57367 | Pickstown | 146 |
| 12. | 57717 | Belle Fourche | 148 |
| 13. | 57762 | Nisland | 150 |
| 14. | 57751 | Keystone | 154 |
| 15. | 57779 | Saint Onge | 157 |
| 16. | 57706 | Ellsworth AFB | 157 |
| 17. | 57201 | Watertown | 158 |
| 18. | 57075 | Wentworth | 159 |
| 19. | 57769 | Piedmont | 159 |
| 20. | 57773 | Pringle | 160 |
