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. | St. Louis County | 133 |
| 2. | St. Charles County | 129 |
| 3. | Platte County | 128 |
| 4. | Cass County | 99 |
| 5. | Clay County | 98 |
| 6. | Jefferson County | 89 |
| 7. | Cole County | 88 |
| 8. | Franklin County | 87 |
| 9. | Camden County | 84 |
| 10. | Jackson County | 80 |
| 11. | Boone County | 79 |
| 12. | Scotland County | 76 |
| 13. | Carroll County | 74 |
| 14. | Howard County | 73 |
| 15. | Warren County | 73 |
| 16. | Christian County | 71 |
| 17. | Buchanan County | 70 |
| 18. | Andrew County | 70 |
| 19. | Clinton County | 67 |
| 20. | Henry County | 67 |
