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St. Clair County is the ninth most populous county in Illinois. Located directly east of St. Louis, the county is part of the Metro East region of the Greater St. Louis metropolitan area in southern Illinois.
The St. Clair County Administration and Courts Building is preparing to undergo extensive renovations that will affect parking, traffic, and building access. To aid those who are planning on visiting the building, we have set up an informational page that will provide the most up-to-date notices. Know Before You Go. How Can We Help You? Residents.
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.
Welcome To St. Clair County. Whether you're a prospective resident or a business owner looking to relocate, we are excited to showcase all that our county has to offer. Located in the heart of the Midwest, St. Clair County boasts a rich history and a diverse community.
St. Clair County is the oldest county in the U.S. state of Illinois. According to the 2020 census, it had a population of 257,400, [1] making it the ninth-most populous county in Illinois. Its county seat is Belleville. [2] The county was founded in 1790, before the establishment of Illinois as a state.
In 2022, St. Clair County, IL had a population of 257k people with a median age of 39.4 and a median household income of $68,915. Between 2021 and 2022 the population of St. Clair County, IL declined from 258,597 to 256,791, a −0.698% decrease and its median household income grew from $63,017 to $68,915, a 9.36% increase.
St. Clair County, Illinois has 657.7 square miles of land area and is the 28th largest county in Illinois by total area. Topics in the St. Clair County, Illinois data profile include: Populations and People; Income and Poverty; Education; Employment; Housing; Health; Business and Economy; Families and Living Arrangements; Race and Ethnicity
