Illinois Gazetteer
| Name | County | Total Population | |
|---|---|---|---|
| 1. | City of Chicago | Cook | 2,635,574 |
| 2. | City of Aurora | Kane | 175,982 |
| 3. | City of Joliet | Will | 148,175 |
| 4. | City of Naperville | DuPage | 147,525 |
| 5. | City of Rockford | Winnebago | 144,488 |
| 6. | City of Elgin | Kane | 113,292 |
| 7. | City of Springfield | Sangamon | 112,480 |
| 8. | City of Peoria | Peoria | 109,440 |
| 9. | City of Champaign | Champaign | 88,387 |
| 10. | City of Waukegan | Lake | 87,168 |
| 11. | Town of Cicero | Cook | 79,373 |
| 12. | City of Bloomington | McLean | 78,399 |
| 13. | Village of Schaumburg | Cook | 76,862 |
| 14. | City of Evanston | Cook | 75,160 |
| 15. | Village of Arlington Heights | Cook | 74,254 |
| 16. | Village of Bolingbrook | Will | 72,964 |
| 17. | City of Decatur | Macon | 67,535 |
| 18. | Village of Palatine | Cook | 64,427 |
| 19. | Village of Skokie | Cook | 64,176 |
| 20. | City of Des Plaines | Cook | 58,152 |
