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. | Flathead County | 46 |
| 2. | Lake County | 49 |
| 3. | Madison County | 49 |
| 4. | Meagher County | 50 |
| 5. | Park County | 52 |
| 6. | Granite County | 52 |
| 7. | Sanders County | 52 |
| 8. | Broadwater County | 54 |
| 9. | Missoula County | 55 |
| 10. | Lincoln County | 56 |
| 11. | Gallatin County | 57 |
| 12. | Ravalli County | 57 |
| 13. | Mineral County | 58 |
| 14. | Musselshell County | 59 |
| 15. | Beaverhead County | 59 |
| 16. | Carbon County | 63 |
| 17. | Jefferson County | 66 |
| 18. | Yellowstone County | 71 |
| 19. | Powell County | 73 |
| 20. | Lewis and Clark County | 73 |