Cities & Towns in Saint Clair County, IL
Saint Clair County, The County of St. Clair is the oldest county in the U. S. Illinois state; the Mississippi River, bordering the U, forms its western boundary. S. Missouri State. In southern Illinois, it is part of the Metro East. It had a population of 270,056 according to the 2010 United States Census, making it the eighth-most populous county in Illinois and the most populous in the state's southern part. Its seat in the county is Belleville.. As of 2020 county had an estimated population of 258,046 inhabitants. The county was created 234 years ago in 1790. Its county seat is Belleville.
There are 35 city/town in Saint Clair County, IL. The largest city of Saint Clair County is Belleville with a population of 40,536. Other cities include, O'Fallon population 29,606, East Saint Louis population 25,776, Crest Hill population 20,209, Fairview Heights population 16,127
Belleville
Belleville, The county seat of St.
O'Fallon
O'Fallon, Township in St.
East Saint Louis
East Saint Louis, City in St.
Bordered by the Mississippi River to the west and rolling prairie farmlands to the east, St. Clair County, Illinois encapsulates both industrial power and small-town Midwest charm. Its unique cities provide glimpses into the region's storied past and promising future.
The historic riverfront town of Belleville serves as the county seat and bustles as a dining and shopping hub, fueled by Lindenwood University. Nearby towns like Freeburg retain their quaint downtown districts dotted with cafes and boutiques.
Further east, New Athens and Millstadt exude rural charm through entities like the Kaskaskia College Agricultural Center and celebrations of the region's German Catholic roots.
Revitalized river cities like Sauget showcase the area's manufacturing legacy through landmarks like the National City Steel Plant and celebrations of its multi-ethnic immigrant communities. From the rolling cornfields of its eastern border to the mighty Mississippi River, St. Clair County's diverse cities encapsulate the essence of life in southwestern Illinois.
All Saint Clair County Cities (Aphebetical)
List of cities, towns, neighborhoods & other populated places in Saint Clair County.
| City Name | Title | Population |
|---|---|---|
| Alorton | City in Illinois, United States of America | 1,880 |
| Belleville | The county seat of St. | 40,536 |
| Brooklyn | Village in Illinois, United States | 1,688 |
| Cahokia | Village in St. | 13,742 |
| Caseyville | City in Illinois, United States of America | 4,115 |
| Centreville | City in Illinois, United States | 4,844 |
| Crest Hill | City in Will County, Illinois | 20,209 |
| Douglas | Unincorporated community in Illinois | 160 |
| Dupo | City in Illinois, United States of America | 3,845 |
| East Carondelet | Human settlement in United States of America | 469 |
| East Saint Louis | City in St. | 25,776 |
| Fairmont City | Town in Illinois, United States | 2,439 |
| Fairview Heights | City in Saint Clair County, Illinois, United States | 16,127 |
| Fayetteville | Village in St. | 336 |
| Freeburg | City in Illinois, United States of America | 4,223 |
| Lebanon | City in St. | 4,225 |
| Lenzburg | Human settlement in Illinois, United States of America | 498 |
| Marissa | Human settlement in Illinois, United States of America | 1,785 |
| Mascoutah | City in Saint Clair County, Illinois, United States | 8,076 |
| Miller | Township in LaSalle County, Illinois | 593 |
| Millstadt | Village in St. | 3,821 |
| New Athens | Village in St. | 1,865 |
| O'Fallon | Township in St. | 29,606 |
| Petersburg | City in Menard County, Illinois | 2,207 |
| Pontiac | City in Illinois, USA | 11,176 |
| Rosemont | Village in the U. | 4,147 |
| Saint Libory | Human settlement in Illinois, United States of America | 601 |
| Sauget | Human settlement in Illinois, United States of America | 154 |
| Shiloh | Town in St. | 13,653 |
| Smithton | Borough in Westmoreland County, Pennsylvania, United States of America | 3,812 |
| Summerfield | Village in St. | 391 |
| Summit | Village in Illinois, USA | 10,977 |
| Swansea | Village in St. | 13,276 |
| Union Hill | Human settlement in Illinois, United States of America | 56 |
| Washington Park | Census-designated place in Broward County, Florida | 3,831 |
