Illinois
Demographics
by Cubit
Demographics Reports
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A-Z Counties & Cities
Zip Codes
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Illinois Demographics Site Map
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Browse Illinois Counties & Cities Alphabetically
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Browse Illinois Zip Codes
Zip Codes by Population
Largest 10 Counties by Population
Cook County
DuPage County
Lake County
Will County
Kane County
McHenry County
Winnebago County
Madison County
St. Clair County
Champaign County
Largest 10 Cities by Population
Chicago
Aurora
Naperville
Rockford
Joliet
Springfield
Peoria
Elgin
Champaign
Waukegan
Largest 10 Zip Codes by Population
60629
60618
60639
60632
60647
60617
60804
60608
60625
60623