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.
| Name | County | Wealth Index | |
|---|---|---|---|
| 1. | Village of Brooklyn | St. Clair | 18 |
| 2. | Village of Hopkins Park | Kankakee | 20 |
| 3. | Village of Washington Park | St. Clair | 22 |
| 4. | City of Venice | Madison | 23 |
| 5. | Village of Alorton | St. Clair | 23 |
| 6. | Village of Sauget | St. Clair | 23 |
| 7. | City of Centreville | St. Clair | 25 |
| 8. | City of East Saint Louis | St. Clair | 27 |
| 9. | City of Mounds | Pulaski | 27 |
| 10. | City of Mound City | Pulaski | 29 |
| 11. | Village of Sun River Terrace | Kankakee | 30 |
| 12. | Village of Robbins | Cook | 30 |
| 13. | City of Cairo | Alexander | 30 |
| 14. | Village of Ullin | Pulaski | 31 |
| 15. | Village of Bush | Williamson | 32 |
| 16. | City of Hurst | Williamson | 32 |
| 17. | City of Johnston City | Williamson | 33 |
| 18. | Village of Carrier Mills | Saline | 33 |
| 19. | Village of Palmyra | Macoupin | 33 |
| 20. | City of Metropolis | Massac | 35 |
