Illinois Demographics Site Map

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Browse Illinois Zip Codes

• Zip Codes by Population

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. Naperville
4. Rockford
5. Joliet
6. Springfield
7. Peoria
8. Elgin
9. Champaign
10. Waukegan

Largest 10 Zip Codes by Population

1. 60629
2. 60618
3. 60639
4. 60632
5. 60647
6. 60617
7. 60804
8. 60608
9. 60625
10. 60623