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. | 59022 | Crow Agency | 350 |
| 2. | 59031 | Garryowen | 350 |
| 3. | 59043 | Lame Deer | 350 |
| 4. | 59323 | Colstrip | 350 |
| 5. | 59454 | Kevin | 350 |
| 6. | 59530 | Inverness | 350 |
| 7. | 59540 | Rudyard | 350 |
| 8. | 59484 | Sweet Grass | 347 |
| 9. | 59089 | Wyola | 344 |
| 10. | 59527 | Hays | 338 |
| 11. | 59259 | Richey | 336 |
| 12. | 59528 | Hingham | 327 |
| 13. | 59035 | Fort Smith | 322 |
| 14. | 59275 | Westby | 320 |
| 15. | 59075 | Saint Xavier | 318 |
| 16. | 59016 | Busby | 308 |
| 17. | 59482 | Sunburst | 308 |
| 18. | 59544 | Whitewater | 305 |
| 19. | 59219 | Dagmar | 303 |
| 20. | 59050 | Lodge Grass | 301 |
