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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. Charles Mound in the northwest Driftless Area is the highest point ...
There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its postal abbreviation is IL.
According to the United States Census Bureau, the City of Chicago has a total area of 606.1 km 2 (234.0 mi 2 ). 588.3 km 2 (227.1 mi 2) of it is land and 17.8 square kilometres (6.9 sq mi) of it is water. The total area is 2.94% water. The city has been built on relatively flat land, the average height of land is 579 feet (176 m) above sea level.
Fort Sheridan, Highwood, Illinois (closed 1993) Fort Arlington, Arlington Heights, Illinois. Green River Ordnance Plant. Haley Army Airfield. Joliet Army Ammunition Plant, Joliet, Illinois. Rock Island Arsenal, Rock Island, Illinois. Savanna Army Depot, Savanna, Illinois (Closed circa 2000)
Originally Chicago to St. Louis, mostly replaced by US 66 except from Springfield to Staunton where IL 4 was used on the old road and US 66 on the new; IL 4 replaced the old IL 43 Staunton to near Murphysboro IL 4A — — — — 1925: 1967 Ran Chicago to Joliet along Archer Av., Replaced by IL 171: IL 5 — — — —
Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States.With a population of 2,746,388, as of the 2020 census, it is the third-most populous city in the United States after New York City and Los Angeles.
State. Illinois. Largest city. Chicago. Population. 9.7 million. Northern Illinois is a region generally covering the northern third of the U.S. state of Illinois. [1] [2] The region is by far the most populous of Illinois with nearly 9.7 million residents as of 2010.
The Chicago metropolitan area, also referred to as the Greater Chicago Area and Chicagoland, is the largest metropolitan statistical area in the U.S. state of Illinois, containing the City of Chicago along with its surrounding suburbs and satellite cities. Encompassing 10,286 square mi (28,120 km 2 ), the metropolitan area includes the city of ...