Illinois Gazetteer
| Name | County | Total Population | |
|---|---|---|---|
| 1. | City of Chicago | Cook | 2,672,258 |
| 2. | City of Aurora | Kane | 176,706 |
| 3. | City of Joliet | Will | 149,952 |
| 4. | City of Naperville | DuPage | 148,402 |
| 5. | City of Rockford | Winnebago | 146,025 |
| 6. | City of Elgin | Kane | 113,599 |
| 7. | City of Springfield | Sangamon | 113,006 |
| 8. | City of Peoria | Peoria | 110,655 |
| 9. | City of Champaign | Champaign | 88,863 |
| 10. | City of Waukegan | Lake | 87,270 |
| 11. | Town of Cicero | Cook | 81,097 |
| 12. | City of Bloomington | McLean | 78,804 |
| 13. | Village of Schaumburg | Cook | 77,461 |
| 14. | City of Evanston | Cook | 76,284 |
| 15. | Village of Arlington Heights | Cook | 75,066 |
| 16. | Village of Bolingbrook | Will | 73,186 |
| 17. | City of Decatur | Macon | 68,560 |
| 18. | Village of Palatine | Cook | 65,628 |
| 19. | Village of Skokie | Cook | 65,270 |
| 20. | City of Des Plaines | Cook | 59,081 |
