Illinois Gazetteer
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. | Lake County | 171 |
| 2. | DuPage County | 163 |
| 3. | Will County | 134 |
| 4. | Kane County | 131 |
| 5. | McHenry County | 130 |
| 6. | Monroe County | 122 |
| 7. | Woodford County | 112 |
| 8. | Kendall County | 108 |
| 9. | McLean County | 102 |
| 10. | Boone County | 100 |
| 11. | Cook County | 99 |
| 12. | Grundy County | 99 |
| 13. | Calhoun County | 94 |
| 14. | Jersey County | 93 |
| 15. | Sangamon County | 92 |
| 16. | Piatt County | 91 |
| 17. | Madison County | 89 |
| 18. | Effingham County | 86 |
| 19. | St. Clair County | 84 |
| 20. | Tazewell County | 84 |
