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A map of the counties and county equivalents of the United States. The 100 most populous counties are highlighted, with counties having more than one million residents in orange and counties having fewer than one million residents in green, based on the results of the April 1, 2020 United States census .
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]
The Peoria Metropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of six counties in Central Illinois, anchored by the city of Peoria. As of the 2020 census, the area had a population of 402,391. [2] The City of Peoria, according to the 2020 US Census Bureau, has 113,150 people. [3]
Locally, Sangamon County saw a decrease from July 1 of 2020 to 2023 of 196,144 to 193,491, or 1.35% of the county's population was lost. An aerial view of Springfield is seen on Monday, April 1, 2024.
Illinois also has two counties named after the same person, New York governor DeWitt Clinton (DeWitt County, and Clinton County). Information on the FIPS county code , county seat , year of establishment, origin, etymology , population, area and map of each county is included in the table below.
The Rockford Metropolitan Statistical Area, as defined by the United States Census Bureau, is an area consisting of four counties in north-central Illinois, anchored by the city of Rockford. As of the 2010 census, the MSA had a population of 349,431 (though a 2011 estimate placed the population at 348,360). [2]
Among all the counties in the US, there is a wide range in life expectancy from birth. The residents of Summit County, Colorado, live the longest with a life expectancy of 86.83 years. The residents of Oglala Lakota County (formerly Shannon County) of South Dakota live the shortest, with a life expectancy of 66.81 years—twenty years less. [3]
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). [1]