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. | Buffalo County | 29 |
| 2. | Oglala Lakota County | 30 |
| 3. | Todd County | 30 |
| 4. | Mellette County | 35 |
| 5. | Corson County | 41 |
| 6. | Bennett County | 42 |
| 7. | Ziebach County | 42 |
| 8. | Jones County | 44 |
| 9. | Dewey County | 49 |
| 10. | Fall River County | 56 |
| 11. | Davison County | 56 |
| 12. | Butte County | 57 |
| 13. | Haakon County | 57 |
| 14. | Jackson County | 57 |
| 15. | Charles Mix County | 59 |
| 16. | Clay County | 59 |
| 17. | Tripp County | 59 |
| 18. | Gregory County | 60 |
| 19. | Lyman County | 61 |
| 20. | Clark County | 63 |
