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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.
Marion County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 37,729. [1] Its county seat is Salem. [2] Marion County comprises the Centralia, IL Micropolitan Statistical Area, which is included in the St. Louis-St. Charles-Farmington, MO-IL Combined Statistical Area.
Map of the United States with Illinois highlighted. Illinois is a state located in the Midwestern United States.According to the 2020 United States census, Illinois is the 6th most populous state with 12,812,508 inhabitants but the 24th largest by land area spanning 55,499.0 square miles (143,742 km 2) of land. [1]
Collar counties is a colloquialism for DuPage, Kane, Lake, McHenry, and Will counties, the five counties of Illinois that border Cook County, which is home to Chicago.The collar counties are part of the Chicago metropolitan area and comprise many of the area's suburbs.
The location of the state of Illinois in the United States of America An enlargeable map of the 102 counties of the state of Illinois. Prehistory of Illinois. Indigenous peoples. Mississippian culture. Cahokia; French colony of Louisiane, 1699–1763; Upper Louisiana was called Illinois Country. Treaty of Paris of 1763
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 .
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.
Bolingbrook is a village in Will and DuPage counties in the U.S. state of Illinois.It is a southwest suburb of Chicago on I-55 and Historic Route 66 (Frontage Road). The village was a new town built on the Gateway Wetlands west of the Des Plaines River in the 1960s.