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Illinois

Counties and county-equivalents (102)

Largest incorporated cities

  1. 1. Chicago · 2,731,585
  2. 2. Aurora · 181,505
  3. 3. Naperville · 153,114
  4. 4. Joliet · 152,241
  5. 5. Rockford · 147,384
  6. 6. Elgin · 115,476
  7. 7. Springfield · 112,989
  8. 8. Peoria · 110,920
  9. 9. Champaign · 91,195
  10. 10. Waukegan · 87,940

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Cities ranked by Census Vintage 2025 SUB-EST2025 population estimates for incorporated places. Counties and county-equivalents from Census Vintage 2025 CO-EST2025.

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