Identifiers: city · village · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Marion (city), IL | 16,855 |
| 2 | Harrisburg (city), IL | 8,219 |
| 3 | Eldorado (city), IL | 3,743 |
| 4 | Carrier Mills (village), IL | 1,672 |
| 5 | Norris City (village), IL | 1,145 |
| 6 | Shawneetown (city), IL | 1,054 |
| 7 | Ridgway (village), IL | 851 |
| 8 | Galatia (village), IL | 827 |
| 9 | Pittsburg (village), IL | 565 |
| 10 | Equality (village), IL | 539 |
| 11 | Crab Orchard (CDP), IL | 356 |
| 12 | Raleigh (village), IL | 284 |
| 13 | Stonefort (village), IL | 224 |
| 14 | Omaha (village), IL | 209 |
| 15 | Broughton (village), IL | 185 |
| 16 | New Burnside (village), IL | 153 |
| 17 | Eddyville (village), IL | 99 |
| 18 | Muddy (village), IL | 61 |
| 19 | Junction (village), IL | 56 |