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. Joliet
4. Naperville
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. 60608
8. 60617
9. 60625
10. 60623

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. Grundy County
10. Woodford County
11. Piatt County
12. Calhoun County
13. Clinton County
14. Boone County
15. McLean County
16. Sangamon County
17. Madison County
18. Jersey County
19. Menard County
20. Tazewell County

20 Richest Cities in Illinois

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