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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.
Illinois is the most populous state in the Midwest region. Chicago, the third-most populous city in the United States, is the center of the Chicago metropolitan area or Chicagoland, as this area is nicknamed. Although the Chicago metropolitan area comprises only 9% of the land area of the state, it contains 65% of the state's residents.
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.
The Chicago metropolitan area, also referred to as the Greater Chicago Area and Chicagoland, is the largest metropolitan statistical area in the U.S. state of Illinois, containing the City of Chicago along with its surrounding suburbs and satellite cities. Encompassing 10,286 square mi (28,120 km 2 ), the metropolitan area includes the city of ...
Illinois has a maximum north–south distance of 390 miles (630 km) and 210 miles (340 km) east-west. Total area is 57,918 square miles (150,010 km 2 ), ranked 25th in size of the 50 states. Water area is 2,325 square miles (6,020 km 2 ); Lake Michigan accounts for most of this. Charles Mound in the northwest Driftless Area is the highest point ...
Central Illinois. Coordinates: 40.1°N 89.3°W. Central Illinois. Central Illinois is a region of the U.S. state of Illinois that consists of the entire central third of the state, divided from north to south. Also known as the Heart of Illinois, it is characterized by small towns and mid-sized cities. Agriculture, particularly corn and ...
Website. rockfordil .gov. [8] Rockford is a city in Winnebago County, Illinois, United States. Located in far northern part of the state on the banks of the Rock River, Rockford is the county seat of Winnebago County (with a small portion of the city located in Ogle County ). The most-populous Illinois city outside of the Chicago metropolitan ...
5th, 9th, 10th, 11th. Website. www .lakecountyil .gov. Lake County is 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. Its county seat is Waukegan, the tenth-largest city in ...