Identifiers: city · town · village
| Rank | Community | Population |
|---|---|---|
| 1 | Chicago (city), IL | 2,746,388 |
| 2 | Naperville (city), IL | 149,540 |
| 3 | Cicero (town), IL | 85,268 |
| 4 | Schaumburg (village), IL | 78,723 |
| 5 | Arlington Heights (village), IL | 77,676 |
| 6 | Bolingbrook (village), IL | 73,922 |
| 7 | Palatine (village), IL | 67,908 |
| 8 | Des Plaines (city), IL | 60,675 |
| 9 | Oak Lawn (village), IL | 58,362 |
| 10 | Berwyn (city), IL | 57,250 |
| 11 | Mount Prospect (village), IL | 56,852 |
| 12 | Oak Park (village), IL | 54,583 |
| 13 | Wheaton (city), IL | 53,970 |
| 14 | Hoffman Estates (village), IL | 52,530 |
| 15 | Downers Grove (village), IL | 50,247 |
| 16 | Elmhurst (city), IL | 45,786 |
| 17 | Lombard (village), IL | 44,476 |
| 18 | Carol Stream (village), IL | 39,854 |
| 19 | Park Ridge (city), IL | 39,656 |
| 20 | Hanover Park (village), IL | 37,470 |