Ranking of St. Clair County, IL Cities and Places By Population in 2023

Updated on August 16, 2024.

Based on the US Census Vintage data estimates, in 2023, among all St. Clair County, IL cities and places, Balance of St. Clair County had the highest population (50.15K), followed by Belleville city (40.73K), and O'Fallon city (31.97K).

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.

See this for other years:
Ranking of St. Clair County, IL Cities and Places By Population in 2023
Balance of St. Clair County
Belleville city
O'Fallon city
East St. Louis city
Cahokia Heights city
Fairview Heights city
Shiloh village
Swansea village
Mascoutah city
Lebanon city
Ranking of St. Clair County, IL Cities and Places By Population in 2023
Items per page:
0 of 0
Rank City or Place Population
1 Balance of St. Clair County 50146
2 Belleville city 40726
3 O'Fallon city 31968
4 East St. Louis city 17642
5 Cahokia Heights city 17114
6 Fairview Heights city 16125
7 Shiloh village 14736
8 Swansea village 14472
9 Mascoutah city 8916
10 Lebanon city 4571
11 Freeburg village 4501
12 Caseyville village 4359
13 Millstadt village 3943
14 Smithton village 3900
15 Dupo village (pt.) 3821
16 Collinsville city (pt.) 2590
17 Washington Park village 2493
18 Fairmont City village (pt.) 2153
19 New Athens village 1873
20 Marissa village 1752
21 Brooklyn village 626
22 St. Libory village 610
23 Lenzburg village 451
24 East Carondelet village 375
25 Summerfield village 332
26 Fayetteville village 286
27 New Baden village (pt.) 210
28 Columbia city (pt.) 194
29 Sauget village 132
30 Madison city (pt.) 1
31 Hecker village (pt.) 0