Identifiers: city · village
| Rank | Community | Population |
|---|---|---|
| 1 | Elgin (city), IL | 114,797 |
| 2 | Schaumburg (village), IL | 78,723 |
| 3 | Arlington Heights (village), IL | 77,676 |
| 4 | Palatine (village), IL | 67,908 |
| 5 | Hoffman Estates (village), IL | 52,530 |
| 6 | Buffalo Grove (village), IL | 43,212 |
| 7 | Crystal Lake (city), IL | 40,269 |
| 8 | Streamwood (village), IL | 39,577 |
| 9 | Carpentersville (village), IL | 37,983 |
| 10 | Mundelein (village), IL | 31,560 |
| 11 | Algonquin (village), IL | 29,700 |
| 12 | Lake in the Hills (village), IL | 28,982 |
| 13 | Huntley (village), IL | 27,740 |
| 14 | McHenry (city), IL | 27,135 |
| 15 | Woodstock (city), IL | 25,630 |
| 16 | South Elgin (village), IL | 23,865 |
| 17 | Lake Zurich (village), IL | 19,759 |
| 18 | Round Lake (village), IL | 18,721 |
| 19 | Cary (village), IL | 17,826 |
| 20 | Wauconda (village), IL | 14,084 |
Identifiers: city · village
| Rank | Community | Population |
|---|---|---|
| 1 | Elgin (city), IL | 114,797 |
| 2 | Schaumburg (village), IL | 78,723 |
| 3 | Palatine (village), IL | 67,908 |
| 4 | Hoffman Estates (village), IL | 52,530 |
| 5 | Buffalo Grove (village), IL | 43,212 |
| 6 | Crystal Lake (city), IL | 40,269 |
| 7 | Streamwood (village), IL | 39,577 |
| 8 | Carpentersville (village), IL | 37,983 |
| 9 | Mundelein (village), IL | 31,560 |
| 10 | Algonquin (village), IL | 29,700 |
| 11 | Lake in the Hills (village), IL | 28,982 |
| 12 | Huntley (village), IL | 27,740 |
| 13 | McHenry (city), IL | 27,135 |
| 14 | Woodstock (city), IL | 25,630 |
| 15 | South Elgin (village), IL | 23,865 |
| 16 | Lake Zurich (village), IL | 19,759 |
| 17 | Round Lake (village), IL | 18,721 |
| 18 | Cary (village), IL | 17,826 |
| 19 | Wauconda (village), IL | 14,084 |
| 20 | Barrington (village), IL | 10,722 |