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Illinois also has two counties named after the same person, New York governor DeWitt Clinton (DeWitt County, and Clinton County). Information on the FIPS county code , county seat , year of establishment, origin, etymology , population, area and map of each county is included in the table below.
House in Lebanon, Il historic district Mermaid House Hotel, Lebanon, Illinois. 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.
Centralia is a city in Clinton, Jefferson, Marion, and Washington counties in the U.S. state of Illinois with the largest portion in Marion County. The city is the largest in three counties, Clinton, Marion, and Washington, but it is not a county seat for any of them. The population was 12,182 as of the 2020 census, down from 13,032 in 2010. [4]
Williamson County is a county in Southern Illinois. At the 2020 census, it had a population of 67,153. [1] The largest city and county seat is Marion. [2] Williamson County is included in the Carbondale-Marion, IL Metropolitan Statistical Area. This area of Southern Illinois is known locally as "Little Egypt".
Will County is a county in the northeastern part of the state of Illinois. According to the 2020 census , it had a population of 696,355, an increase of 2.8% from 677,560 in 2010, making it Illinois's fourth-most populous county. [ 1 ]
McHenry County is a county located in the U.S. state of Illinois. According to the 2020 Census, it had a population of 310,229, [2] making it the sixth-most populous county in Illinois. Its county seat is Woodstock. [3] McHenry County is one of the five Illinois collar counties in the Chicago metropolitan area.
Boone County is a county located in the U.S. state of Illinois. As of the 2020 census, the population was 53,448. Its county seat is Belvidere. [1] Boone County is included in the Rockford, Illinois metropolitan area.
Douglas County is a county located in the U.S. state of Illinois. As of the 2020 United States census , the population was 19,740. [ 1 ] The county seat is Tuscola .