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. | Stanley County | 126 |
| 2. | Sully County | 116 |
| 3. | Union County | 110 |
| 4. | Lincoln County | 107 |
| 5. | Edmunds County | 96 |
| 6. | Perkins County | 90 |
| 7. | Potter County | 89 |
| 8. | Spink County | 88 |
| 9. | Grant County | 85 |
| 10. | Hamlin County | 83 |
| 11. | Hutchinson County | 83 |
| 12. | Yankton County | 83 |
| 13. | Sanborn County | 82 |
| 14. | Douglas County | 81 |
| 15. | Brown County | 80 |
| 16. | Marshall County | 80 |
| 17. | Lake County | 80 |
| 18. | Pennington County | 79 |
| 19. | Campbell County | 79 |
| 20. | Codington County | 79 |
