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Springfield is the capital city of the U.S. state of Illinois.Its population was 114,394 at the 2020 United States census, which makes it the state's seventh-most populous city, [10] the second-most populous outside of the Chicago metropolitan area (after Rockford), and the most populous in Central Illinois.
The Springfield Metropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of two counties in Central Illinois, anchored by the city of Springfield. As of the 2000 census , the MSA had a population of 201,437 (though a July 1, 2009 estimate placed the population at 208,182).
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.
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]
A total of 45 counties are typically considered to be within Central Illinois, with a population of 1,874,635 as of the 2020 U.S. Census. Major cities include Peoria, Springfield (the state capital), Decatur, Quincy, Champaign–Urbana, Bloomington–Normal, Galesburg, and Danville. [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'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.
Sangamon County is a county located near the center of the U.S. state of Illinois. According to the 2020 census, it had a population of 196,343. [1] Its county seat and largest city is Springfield, [2] the state capital. Sangamon County is included in the Springfield, IL Metropolitan Statistical Area.