Illinois has 102 counties. The largest is Cook County (5.2 million people) and the smallest is Hardin County (3,665). Median home values run from $56K in Alexander County to $444K in DuPage County (Zillow ZHVI 2024). Effective property tax rates range from 0.85% in Pulaski County to 2.74% in Lake County (Tax Foundation 2023). Median household income is highest in DuPage County ($107K) and lowest in Alexander County ($40K) (Census ACS 2022). Pick a county below for its full profile, or open the county map to filter by your own ranges.
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