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. 60617
8. 60608
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. Calhoun County
11. Woodford County
12. Boone County
13. Piatt County
14. Clinton County
15. McLean County
16. Menard County
17. Jersey County
18. Sangamon County
19. Madison County
20. Effingham County

20 Richest Cities in Illinois

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