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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 ]
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.
East St. Louis is a city in St. Clair County, Illinois, ... In 1950, East St. Louis was the fourth-largest city in Illinois when its population peaked at 82,366.
Lenzburg Township is located in St. Clair County, Illinois. As of the 2010 census, its population was 1,047 and it contained 450 housing units. As of the 2010 census, its population was 1,047 and it contained 450 housing units.
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.
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.
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]
Randolph County: 157: Chester: 1795: St. Clair County: Edmund Randolph (1753–1813), first Attorney General of the United States, and briefly United States Secretary of State: 29,815: 575 sq mi (1,489 km 2) Richland County: 159: Olney: 1841: Clay and Lawrence County: Richland County, Ohio, itself named for its rich soil: 15,488: 360 sq mi (932 ...