Sorted by population.
| County | Population | Median HHI |
|---|---|---|
| Cook County IL |
5,516,095 | $88,624 |
| DuPage County IL |
945,773 | $113,827 |
| Lake County IL |
725,926 | $110,306 |
| Kane County IL |
501,481 | $105,421 |
| Will County IL |
370,450 | $101,355 |
| St. Clair County IL |
231,779 | $73,617 |
| Champaign County IL |
220,981 | $66,814 |
| Madison County IL |
216,024 | $77,611 |
| Kendall County IL |
188,356 | $120,323 |
| Boone County IL |
179,923 | $81,450 |
| Sangamon County IL |
176,619 | $76,966 |
| McLean County IL |
164,376 | $79,244 |
In alphabetical order; geographic adjacency layer planned for v1.1.
Every value drawn from the same federal-source warehouse that powers individual place profiles. See data sources for the full dictionary, methodology for metric definitions.