I3INSIT3
STATE DIRECTORY / IL
2025 POPULATION CENTERS / IL

Illinois.

Canonical weather-risk pages for the ten leading county and county-equivalent population centers in Illinois.

  1. 01Cook County2025 population estimate 5,194,625
  2. 02DuPage County2025 population estimate 934,298
  3. 03Lake County2025 population estimate 719,339
  4. 04Will County2025 population estimate 712,253
  5. 05Kane County2025 population estimate 525,757
  6. 06McHenry County2025 population estimate 317,751
  7. 07Winnebago County2025 population estimate 283,674
  8. 08Madison County2025 population estimate 263,110
  9. 09St. Clair County2025 population estimate 250,708
  10. 10Champaign County2025 population estimate 209,972
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