by Kristen Carney
Updated: June 20, 2024
The most populous counties in Illinois are Cook County with 5,087,072, DuPage County at 921,213, Lake County with 708,760, Will County at 700,728, and Kane County with 514,982. You can get the most current Census population data for all 102 Illinois counties, sorted from the most populous counties in Illinois to the least, according to the 2023 Population Estimates Program.
Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Illinois counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!
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