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Date/Time Thumbnail Dimensions User Comment; current: 14:18, 2 February 2007: 3,453 × 6,157 (83 KB): Dual Freq: This is a map showing Illinois counties Modification of David Benbennick's map.
Illinois's FIPS state code is 17 and its postal abbreviation is IL. What is now Illinois was claimed as part of Illinois County, Virginia, between 1778 and 1782. Modern-day county formation dates to 1790 when the area was part of the Northwest Territory; two counties—St. Clair and Knox—were created at that time.
Saline County is a county in Southern Illinois.At the 2020 census, it had a population of 23,768. [1] The largest city and county seat is Harrisburg. [2] This area of Southern Illinois is known locally as "Little Egypt".
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.
On July 21, 2023, the OMB delineated 14 combined statistical areas, 12 metropolitan statistical areas, and 21 micropolitan statistical areas in Illinois. [1] As of 2023, the largest of these is the Chicago-Naperville, IL-IN-WI CSA , comprising the area around Illinois' largest city, Chicago .
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.
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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. [ 2 ] The county seat is Tuscola .