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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 U.S. State of Illinois currently has 47 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 14 combined statistical areas , 12 metropolitan statistical areas , and 21 micropolitan statistical areas in Illinois. [ 1 ]
Illinois' population slightly declined in 2020 from the 2010 United States census by just over 18,000 residents and the overall population was quite higher than recent census estimates. [84] Illinois 2020 Population Density Map. Illinois is the most populous state in the Midwest region.
List of municipalities in Illinois#Most populous To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .
Robinson is a city in and the county seat of Crawford County, Illinois, United States. [3] The population was 7,150 at the 2020 census, down from 7,713 at the 2010 census . [ 4 ]
The population was 148,655 at the 2020 census, making Rockford the fifth-most populous city in Illinois, as well as the state's most populous city outside of the Chicago metropolitan area. [10] It anchors the Rockford metropolitan area , which had 338,798 residents in 2020.
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.
With a population of 2,746,388, as of the 2020 census, [9] it is the third-most populous city in the United States after New York City and Los Angeles. As the seat of Cook County , the second-most populous county in the U.S., Chicago is the center of the Chicago metropolitan area , often colloquially called "Chicagoland" and home to 9.6 million ...