Illinois Demographics Site Map

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Largest 10 Counties by Population

1. Cook County
2. DuPage County
3. Lake County
4. Will County
5. Kane County
6. McHenry County
7. Winnebago County
8. Madison County
9. St. Clair County
10. Champaign County

Largest 10 Cities by Population

1. Chicago
2. Aurora
3. Rockford
4. Joliet
5. Naperville
6. Springfield
7. Peoria
8. Elgin
9. Waukegan
10. Champaign