Identifiers: city · village
| Rank | Community | Population |
|---|---|---|
| 1 | Springfield (city), IL | 114,394 |
| 2 | Chatham (village), IL | 14,377 |
| 3 | Lincoln (city), IL | 13,288 |
| 4 | Sherman (village), IL | 4,673 |
| 5 | Rochester (village), IL | 3,863 |
| 6 | Riverton (village), IL | 3,532 |
| 7 | Pawnee (village), IL | 2,678 |
| 8 | Petersburg (city), IL | 2,258 |
| 9 | Athens (city), IL | 1,977 |
| 10 | Jerome (village), IL | 1,692 |
| 11 | Southern View (village), IL | 1,596 |
| 12 | Leland Grove (city), IL | 1,454 |
| 13 | Williamsville (village), IL | 1,425 |
| 14 | Grandview (village), IL | 1,405 |
| 15 | New Berlin (village), IL | 1,381 |
| 16 | Divernon (village), IL | 1,139 |
| 17 | Edinburg (village), IL | 1,085 |
| 18 | Illiopolis (village), IL | 846 |
| 19 | Loami (village), IL | 812 |
| 20 | Pleasant Plains (village), IL | 808 |