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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 .
Area code 815 was overlaid with area code 779 in 2007. 847/224: North and northwest suburbs of Chicago including all of Lake County, part of McHenry County, northern Cook County, and northeastern Kane County. This area includes Evanston, Des Plaines, Waukegan, and most of Elgin. Area code 847 was overlaid with area code 224 in 2002.
Chicago Metropolitan Agency for Planning (CMAP) is an Illinois state agency responsible for transportation infrastructure, land use, and long-term economic development planning for the areas under its jurisdiction within Illinois. [23] The planning area has a population of over 8 million, which includes the following locations in Illinois: [24]
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]
Collar counties is a colloquialism for DuPage, Kane, Lake, McHenry, and Will counties, the five counties of Illinois that border Cook County, which is home to Chicago.The collar counties are part of the Chicago metropolitan area and comprise many of the area's suburbs.
The Metro East is an urban area in Southern Illinois, United States that contains the eastern and northern urban, suburban, and exurban areas on the Mississippi River in Greater St. Louis. It encompasses eight Illinois counties and constitutes the second-most populous metropolitan area in Illinois .
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
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.