Identifiers: city · village
| Rank | Community | Population |
|---|---|---|
| 1 | Waukegan (city), IL | 89,321 |
| 2 | Arlington Heights (village), IL | 77,676 |
| 3 | Palatine (village), IL | 67,908 |
| 4 | Mount Prospect (village), IL | 56,852 |
| 5 | Hoffman Estates (village), IL | 52,530 |
| 6 | Buffalo Grove (village), IL | 43,212 |
| 7 | Wheeling (village), IL | 39,137 |
| 8 | Northbrook (village), IL | 35,222 |
| 9 | Mundelein (village), IL | 31,560 |
| 10 | North Chicago (city), IL | 30,759 |
| 11 | Gurnee (village), IL | 30,706 |
| 12 | Highland Park (city), IL | 30,176 |
| 13 | Round Lake Beach (village), IL | 27,252 |
| 14 | McHenry (city), IL | 27,135 |
| 15 | Vernon Hills (village), IL | 26,850 |
| 16 | Zion (city), IL | 24,655 |
| 17 | Rolling Meadows (city), IL | 24,200 |
| 18 | Grayslake (village), IL | 21,248 |
| 19 | Libertyville (village), IL | 20,579 |
| 20 | Lake Zurich (village), IL | 19,759 |