Illinois Gazetteer
| Name | County | Total Population | |
|---|---|---|---|
| 1. | City of Chicago | Cook | 2,712,997 |
| 2. | City of Aurora | Kane | 201,208 |
| 3. | City of Joliet | Will | 149,801 |
| 4. | City of Rockford | Winnebago | 149,574 |
| 5. | City of Naperville | DuPage | 145,061 |
| 6. | City of Elgin | Kane | 114,972 |
| 7. | City of Springfield | Sangamon | 113,310 |
| 8. | City of Peoria | Peoria | 110,768 |
| 9. | City of Waukegan | Lake | 89,184 |
| 10. | City of Champaign | Champaign | 87,530 |
| 11. | Town of Cicero | Cook | 84,255 |
| 12. | City of Bloomington | McLean | 77,375 |
| 13. | City of Evanston | Cook | 76,506 |
| 14. | Village of Bolingbrook | Will | 75,192 |
| 15. | Village of Arlington Heights | Cook | 73,407 |
| 16. | Village of Schaumburg | Cook | 72,796 |
| 17. | City of Decatur | Macon | 71,463 |
| 18. | Village of Palatine | Cook | 66,880 |
| 19. | Village of Skokie | Cook | 63,283 |
| 20. | City of Des Plaines | Cook | 57,581 |
