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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. [1]
The following is a list of incorporated places in the United States with a population density of over 10,000 people per square mile. As defined by the United States Census Bureau, an incorporated place is a place that has a self-governing local government and as such has been "incorporated" by the state it is in.
City State Census Population Change 2010 2020 1 Chicago Illinois: 2,695,598 2,746,388 +1.9%: 2 Columbus
More than half the population of the state of Illinois lives in the Chicago metropolitan area. The 2000 United States census had shown the population density of the city itself was 12,750.3 people per square mile (4,923.0/km 2), making it one of the nation's most densely populated cities.
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.
Located on the Illinois River, the city had a population of 113,150 as of the 2020 census, making it the eighth-most populous city in Illinois. [ 5 ] [ 6 ] It is the principal city of the Peoria metropolitan area in Central Illinois , consisting of the counties of Fulton , Marshall , Peoria , Stark , Tazewell , and Woodford which had a ...
As a result, the city of Chicago was divided into two area codes, 312 and 773. Rather than divide the city by a north–south area code, the central business district retained the 312 area code, while the remainder of the city took the new 773 code. In 2002, the 847 area code was supplemented with the overlay area code 224.
About 10.4% of families and 12.2% of the population were below the poverty line, including 16.2% of those under age 18 and 8.4% of those age 65 or over. [ 17 ] From April 1, 2010, to July 1, 2011, Joliet was the fastest-growing city in the Midwestern United States and the 18th-fastest growing city in the United States among incorporated places ...