The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
| County | Wealth Index | |
|---|---|---|
| 1. | Stillwater County | 107 |
| 2. | Madison County | 99 |
| 3. | Jefferson County | 98 |
| 4. | Daniels County | 98 |
| 5. | Fallon County | 96 |
| 6. | Gallatin County | 93 |
| 7. | Carter County | 93 |
| 8. | Liberty County | 93 |
| 9. | McCone County | 93 |
| 10. | Flathead County | 91 |
| 11. | Richland County | 91 |
| 12. | Broadwater County | 90 |
| 13. | Sheridan County | 86 |
| 14. | Beaverhead County | 83 |
| 15. | Lake County | 83 |
| 16. | Valley County | 80 |
| 17. | Yellowstone County | 79 |
| 18. | Dawson County | 79 |
| 19. | Fergus County | 79 |
| 20. | Sweet Grass County | 78 |
