Identifiers: city · village · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Peoria (city), IL | 113,150 |
| 2 | Pekin (city), IL | 31,731 |
| 3 | East Peoria (city), IL | 22,484 |
| 4 | Morton (village), IL | 17,117 |
| 5 | Washington (city), IL | 16,071 |
| 6 | Chillicothe (city), IL | 6,128 |
| 7 | Bartonville (village), IL | 5,945 |
| 8 | Peoria Heights (village), IL | 5,908 |
| 9 | Eureka (city), IL | 5,227 |
| 10 | Creve Coeur (village), IL | 4,934 |
| 11 | West Peoria (city), IL | 4,263 |
| 12 | Metamora (village), IL | 3,904 |
| 13 | Germantown Hills (village), IL | 3,412 |
| 14 | Marquette Heights (city), IL | 2,541 |
| 15 | Tremont (village), IL | 2,277 |
| 16 | Elmwood (city), IL | 2,058 |
| 17 | Bellevue (village), IL | 1,878 |
| 18 | Lake Camelot (CDP), IL | 1,798 |
| 19 | Rome (CDP), IL | 1,604 |
| 20 | Dunlap (village), IL | 1,603 |