A new SmartAsset study ranked the 10 wealthiest counties in Illinois based on income, home values, and investment income. Lake, DuPage, and Kendall counties took the top three spots. Cook County ...

While Lake County ranked as the wealthiest county overall, it had the third-highest median income of $104,553. Spanning all counties, the overall median income is $62,930.

St. Clair County came in as the 31st most wealthy in Illinois, with a median income of $68,915. Here’s how the 10 wealthiest counties in Illinois stacked up, from SmartAsset.

With a median income of $63,017, St. Clair County is the 28th wealthiest county in Illinois, according to a recent analysis from tech company SmartAsset. Measuring median income, investment income ...