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

Largest 10 Zip Codes by Population

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

20 Richest Counties in Illinois

1. Lake County
2. DuPage County
3. Will County
4. Kane County
5. McHenry County
6. Kendall County
7. Monroe County
8. Cook County
9. Piatt County
10. Grundy County
11. Woodford County
12. Clinton County
13. Boone County
14. Calhoun County
15. McLean County
16. Sangamon County
17. Effingham County
18. Madison County
19. Jersey County
20. Ogle County

20 Richest Cities in Illinois

1. Kenilworth
2. Winnetka
3. Glencoe
4. Bannockburn
5. Hinsdale
6. Hollowayville
7. Long Grove
8. Riverwoods
9. Barrington Hills
10. Golf
11. Kildeer
12. Western Springs
13. Lake Forest
14. North Barrington
15. South Barrington
16. Wilmette
17. Lake Bluff
18. Oak Brook
19. Hawthorn Woods
20. Northfield