<Tr> <Th> GNIS feature ID </Th> <Td> 0428803 </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.cityofchicago.org </Td> </Tr> <P> Chicago (/ ʃɪˈkɑːɡoʊ / (listen), locally also / - ˈkɔː - /), officially the City of Chicago, on Lake Michigan in Illinois, is one of the largest cities in the United States . As of the 2017 census - estimated population of 2,716,450, Chicago is the third most populous city in the United States after New York and Los Angeles, and the most populous city in both the state of Illinois and the Midwestern United States . It is the county seat of Cook County . The Chicago metropolitan area, often referred to as "Chicagoland", has nearly 10 million people and is the third - largest in the United States and fourth largest in North America . The city is the birthplace of the skyscraper, and considered the most influential architectural city of the 20th century . Chicago saw the creation of the first standardized futures contracts at the Chicago Board of Trade; today its successor has evolved into the largest and most diverse derivatives market in the world, generating 20% of all volume in commodities and financial futures . </P> <P> Chicago was incorporated as a city in 1837 near a portage between the Great Lakes and the Mississippi River watershed and grew rapidly in the mid-nineteenth century . After the Great Chicago Fire of 1871, which destroyed several square miles and left more than 100,000 homeless, the city made a concerted effort to rebuild . The construction boom accelerated population growth throughout the following decades, and by 1900 Chicago was one of the five largest cities in the world . During this period, Chicago made noted contributions to urban planning and zoning standards, which included creating new construction styles (including the Chicago School of architecture), the development of the City Beautiful Movement, and the steel - framed skyscraper . </P>

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