Identifiers: village · city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Oswego (village), IL | 34,585 |
| 2 | Yorkville (city), IL | 21,533 |
| 3 | Montgomery (village), IL | 20,262 |
| 4 | North Aurora (village), IL | 18,261 |
| 5 | Plano (city), IL | 11,847 |
| 6 | Sugar Grove (village), IL | 9,278 |
| 7 | Boulder Hill (CDP), IL | 8,394 |
| 8 | Sandwich (city), IL | 7,221 |
| 9 | Lake Holiday (CDP), IL | 5,687 |
| 10 | Sheridan (village), IL | 2,431 |
| 11 | Hinckley (village), IL | 2,006 |
| 12 | Somonauk (village), IL | 1,786 |
| 13 | Prestbury (CDP), IL | 1,657 |
| 14 | Earlville (city), IL | 1,613 |
| 15 | Big Rock (village), IL | 1,104 |
| 16 | Newark (village), IL | 973 |
| 17 | Leland (village), IL | 951 |
| 18 | Millington (village), IL | 617 |
| 19 | Kaneville (village), IL | 452 |
| 20 | Millbrook (village), IL | 277 |