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  2. Geography of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Illinois

    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.

  3. List of ecoregions in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_ecoregions_in_Illinois

    Illinois' ecology is in a land area of 56,400 square miles (146,000 km 2); the state is 385 miles (620 km) long and 218 miles (351 km) wide and is located between latitude: 36.9540° to 42.4951° N, and longitude: 87.3840° to 91.4244° W, [1] with primarily a humid continental climate.

  4. Category:Regions of Illinois - Wikipedia

    en.wikipedia.org/wiki/Category:Regions_of_Illinois

    Pages in category "Regions of Illinois" ... Illinois statistical areas; W. Wabash Valley This page was last edited on 29 March 2013, at 09:54 (UTC). ...

  5. List of counties in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_counties_in_Illinois

    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.

  6. Outline of Illinois - Wikipedia

    en.wikipedia.org/wiki/Outline_of_Illinois

    The following outline is provided as an overview of and topical guide to the U.S. state of Illinois: Illinois – fifth most populous of the 50 states of the United States of America. Illinois lies between Lake Michigan and the Mississippi River and the Ohio River in the Midwestern United States.

  7. Southern Illinois - Wikipedia

    en.wikipedia.org/wiki/Southern_Illinois

    Southern Illinois is a region of the U.S. state of Illinois comprising the southern third of the state, principally south of Interstate 70.Part of downstate Illinois, it is bordered by the two most voluminous rivers in the United States: the Mississippi below its connection with the Missouri River to the west and the Ohio River to the east and south, with the tributary Wabash River, extending ...

  8. Illinois statistical areas - Wikipedia

    en.wikipedia.org/wiki/Illinois_statistical_areas

    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 .

  9. Fox Valley (Illinois) - Wikipedia

    en.wikipedia.org/wiki/Fox_Valley_(Illinois)

    The Fox Valley—also commonly known as the Fox River Valley—is a region centered on the Fox River of Northern Illinois, along the western edges of the Chicago metropolitan area. [1] The region extends from the village of Antioch , in far northern Illinois, to the city of Ottawa in the south. [ 1 ]