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As of the 2020 United States census, St. Clair County had a population of 257,400, making it the third most populous county in Illinois outside the Chicago metropolitan area. Belleville is the county’s seat and largest city. [ 1 ]
Randolph County and St. Clair County: James Monroe (1758–1831), seventh United States Secretary of State, eighth United States Secretary of War, Governor of Virginia, and fifth President of the United States: 34,957: 385 sq mi (997 km 2) Montgomery County: 135: Hillsboro: 1821: Bond and Madison County
Belleville is a city in and the county seat of St. Clair County, Illinois, United States. [3] The population was 42,404 at the 2020 census, making it the most populated city in the Metro East region of Greater St. Louis, and in all of Southern Illinois.
Collinsville is a city located mainly in Madison County and partially in St. Clair County, Illinois, United States. As of the 2020 census, the city had a population of 24,366. [3] Collinsville is approximately 14 miles (23 km) east of St. Louis, Missouri, and is part of that city's Metro East area. [5]
St. Clair Township is located in St. Clair County, Illinois. As of the 2010 census, its population was 35,498 and it contained 15,366 housing units. [2] St. Clair Township formed from a portion of Belleville Township on October 5, 1885.
Lebanon is a city in St. Clair County, Illinois, United States. The population was 4,691 at the 2020 census It is a part of the Metro East region of the Greater St. Louis metropolitan area. Lebanon is home to McKendree University, the oldest college in Illinois.
Smithton is a village in St. Clair County, Illinois, United States. ... The population density was 1,344.5 inhabitants per square mile (519.1/km 2).
O'Fallon is a city in St. Clair County, Illinois, United States. The 2020 census listed the population at 32,289. The city is the second largest city in the Metro East region of the St. Louis metropolitan area and Southern Illinois. It sits 5 miles (8.0 km) from Scott Air Force Base and 18 miles (29 km) from Downtown St. Louis.