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There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.
This is a map showing Illinois counties Modification of David Benbennick's map. For more information, see Commons:United States county locator maps . {{PD-self}} Maps of Illinois]]
The Interstate Highway System in Illinois consists of 13 primary highways and 11 auxiliary highways which cover 2,248.93 miles (3,619.30 km). [2] The Interstate Highway with the longest section in Illinois is Interstate 57 at 358.57 miles (577.06 km); the shortest is Interstate 41 at 0.90 miles (1.45 km).
12th. Website. www .unioncountyil .gov. Union County is a county located in the U.S. state of Illinois. According to the 2020 United States Census, it had a population of 17,244. [1] Its county seat is Jonesboro. [2] It is located in the southern portion of Illinois known locally as " Little Egypt ".
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. Illinois is divided into 102 counties and, as of 2020, contained 1,300 municipalities consisting of cities, towns, and villages.
Jo Daviess County ( / ˈdeɪvɪs /) is the northwesternmost county in the U.S. state of Illinois. According to the 2020 census, it had a population of 22,035. [1] Its county seat is Galena. [2] Jo Daviess County is part of the Tri-State Area and is located near Dubuque, Iowa and Platteville, Wisconsin.
Congressional district. 12th. Website. www.lawrencecounty illinois.com. Lawrence County is the easternmost county in the U.S. state of Illinois. At the 2020 census, the population was 15,280. [1] Its county seat is Lawrenceville.
UTC−5 ( CDT) Congressional district. 12th. Website. www .alexandercountyil .com. Alexander County is the southernmost and southwesternmost county in the U.S. state of Illinois. As of the 2020 census, the population was 5,240. [1] Its county seat is Cairo [2] and its western boundary is formed by the Mississippi River .