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Knox would later become a county in Indiana and is unrelated to the current Knox County in Illinois, while St. Clair would become the oldest county in Illinois. 15 counties had been created by the time Illinois achieved statehood in 1818. The last county, Ford County, was created in 1859.
This is an accepted version of this page This is the latest accepted revision, reviewed on 25 December 2024. "Cities in Illinois" redirects here. For unincorporated communities, see List of unincorporated communities in Illinois. For CDPs, see List of census-designated places in Illinois. Map of the United States with Illinois highlighted Illinois is a state located in the Midwestern United ...
The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.
State law specifies that no two townships in Illinois shall have the same name, [3] and that, if the Illinois Secretary of State compares the township abstracts and finds a duplicate, the county that last adopted the name shall instead adopt a different name at the next county board meeting. [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". [citation needed]
Bridge on Illinois Route 15 connecting Wabash and Gibson counties. This span no longer exists. According to the U.S. Census Bureau, the county has a total area of 228 square miles (590 km 2), of which 223 square miles (580 km 2) is land and 4.3 square miles (11 km 2) (1.9%) is water. [4] It is the fifth-smallest county in Illinois by area.
Lake County is a county located in the northeastern corner of the U.S. state of Illinois, along the shores of Lake Michigan. As of the 2020 census , it has a population of 714,342, [ 1 ] making it the third-most populous county in Illinois .
Cass County is a county located in the U.S. state of Illinois. As of the 2020 United States Census , the population was 13,042. [ 1 ] Its county seat is Virginia . [ 2 ]