Largest Illinois
counties by population
Cook County ranks number 1 in the state with a population of 5,287,037.
DuPage County ranks number 2 in the state with a population of 932,541.
Lake County ranks number 3 in the state with a population of 712,567.
Will County ranks number 4 in the state with a population of 685,251.
Kane County ranks number 5 in the state with a population of 511,892.
McHenry County ranks number 6 in the state with a population of 320,961.
Winnebago County ranks number 7 in the state with a population of 299,702.
Madison County ranks number 8 in the state with a population of 268,457.
St. Clair County ranks number 9 in the state with a population of 263,617.
Sangamon County ranks number 10 in the state with a population of 195,716.
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