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, The county seat of St.


O'Fallon, Township in St.

East Saint Louis
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.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z all
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

County Cities on Map (35)

Illinois Counties (102)

Cook County (5,108,284) DuPage County (917,481) Lake County (693,593) Will County (688,726) Kane County (531,010) McHenry County (305,888) Winnebago County (281,295) Madison County (262,635) Saint Clair County (258,046) Champaign County (209,192) Sangamon County (193,882) Peoria County (177,652) McLean County (171,256) Rock Island County (140,907) Tazewell County (130,777) Kendall County (130,638) Kankakee County (108,594) LaSalle County (107,571) DeKalb County (104,491) Macon County (103,015) Vermilion County (74,855) Williamson County (66,415) Adams County (64,783) Jackson County (56,675) Whiteside County (54,656) Boone County (52,777) Grundy County (50,993) Coles County (50,383) Ogle County (50,306) Knox County (49,053) Henry County (48,411) Macoupin County (44,567) Stephenson County (43,831) Woodford County (38,091) Franklin County (38,060) Clinton County (37,398) Jefferson County (37,235) Marion County (37,045) Livingston County (35,414) Monroe County (34,739) Effingham County (34,065) Fulton County (33,690) Lee County (33,647) Morgan County (33,400) Bureau County (32,303) Christian County (32,075) Randolph County (31,351) McDonough County (29,295) Logan County (28,383) Montgomery County (28,045) Iroquois County (26,711) Saline County (23,182) Jersey County (21,616) Shelby County (21,299) Fayette County (21,264) Jo Daviess County (21,239) Perry County (20,664) Douglas County (19,510) Crawford County (18,512) Hancock County (17,422) Edgar County (16,858) Warren County (16,696) Union County (16,498) Piatt County (16,355) Bond County (16,262) Wayne County (16,031) Richland County (15,507) Lawrence County (15,467) De Witt County (15,368) Clark County (15,268) Pike County (15,239) Mercer County (15,225) Moultrie County (14,347) Carroll County (14,241) Washington County (13,764) Massac County (13,636) White County (13,364) Mason County (13,173) Clay County (13,079) Ford County (12,949) Greene County (12,702) Johnson County (12,358) Menard County (12,068) Cass County (11,925) Marshall County (11,309) Wabash County (11,190) Cumberland County (10,649) Jasper County (9,465) Hamilton County (8,084) Schuyler County (6,738) Brown County (6,546) Henderson County (6,535) Edwards County (6,356) Putnam County (5,716) Alexander County (5,497) Stark County (5,262) Pulaski County (5,201) Scott County (4,950) Gallatin County (4,793) Calhoun County (4,616) Pope County (4,142) Hardin County (3,808)