Ranking of St. Clair County, IL Cities and Places By Population in 2020
Updated on August 16, 2024.
Based on the US Census Vintage data estimates, in 2020, among all St. Clair County, IL cities and places, Balance of St. Clair County had the highest population (51.85K), followed by Belleville city (42.27K), and O'Fallon city (32.31K).
The chart below shows the top 10 cities and places, and the table below shows the ranking of all St. Clair cities and places.
You can see similar information for other Illinois counties. You can also see the ranking of all cities and places in Illinois.
Data Source: US Census Bureau (Vintage).
See this for other years:
Ranking of St. Clair County, IL Cities and Places By Population in 2020
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| Rank | City or Place | Population |
|---|---|---|
| 1 | Balance of St. Clair County | 51852 |
| 2 | Belleville city | 42266 |
| 3 | O'Fallon city | 32307 |
| 4 | East St. Louis city | 18400 |
| 5 | Cahokia Heights city | 17848 |
| 6 | Fairview Heights city | 16667 |
| 7 | Swansea village | 14351 |
| 8 | Shiloh village | 14112 |
| 9 | Mascoutah city | 8739 |
| 10 | Lebanon city | 4679 |
| 11 | Freeburg village | 4582 |
| 12 | Caseyville village | 4391 |
| 13 | Millstadt village | 4065 |
| 14 | Smithton village | 4003 |
| 15 | Dupo village (pt.) | 3976 |
| 16 | Collinsville city (pt.) | 2698 |
| 17 | Washington Park village | 2573 |
| 18 | Fairmont City village (pt.) | 2234 |
| 19 | New Athens village | 1947 |
| 20 | Marissa village | 1828 |
| 21 | Brooklyn village | 649 |
| 22 | St. Libory village | 629 |
| 23 | Lenzburg village | 467 |
| 24 | East Carondelet village | 390 |
| 25 | Summerfield village | 343 |
| 26 | Fayetteville village | 293 |
| 27 | New Baden village (pt.) | 218 |
| 28 | Columbia city (pt.) | 198 |
| 29 | Sauget village | 138 |
| 30 | Madison city (pt.) | 1 |
| 31 | Hecker village (pt.) | 0 |