Chicago, officially the City of Chicago, is the most populous city in the U.S. state of Illinois, and the third-most populous city in the United States, following New York City and Los Angeles. With a population of 2,746,388 in the 2020 census, it is also the most populous city in the Midwestern United States and the fifth-most populous city in North America. Chicago is the county seat of Cook County, the second-most populous county in the U.S., while a small portion of the city's O'Hare Airport also extends into DuPage County. Chicago is the principal city of the Chicago metropolitan area, defined as either the U.S. Census Bureau's metropolitan statistical area or the combined statistical area, often called Chicagoland. It is one of the 40 largest urban areas in the world. Located on the shores of freshwater Lake Michigan, 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-19th century.

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Study tracks waterbird use of Chicago-area wetlands

Digital Divide: Data Portal Highlights Internet Inequities in Chicago

Boeing plans to relocate its headquarters to Virginia from Chicago.

Study: Many birds nesting, laying eggs earlier in Chicago

Lead lurking in your soil? New Chicago project maps distribution

In Chicago, a New Approach to Gay and Bisexual Men With Prostate Cancer

Across the US, landlords are less likely to respond to applicants with African American and Latino-sounding names when renting properties, a practice that contributes to rising residential segregation. The study found the most discrimination for Black renters in Chicago, Los Angeles and Louisville.

Times Team Explains Chicago's Climate Problem Visually

University of Chicago scientists design "Nanotraps" to catch, clear coronavirus

55 Covid-19 Cases Linked To One Fitness Facility In Chicago

University of Chicago study uncovers inhibitory role of 'Ter cells' in cancer therapies

White Chicago Cops Use Force More Often Than Black Officers

Landmark study of 7000 Chicago police shows nonwhite officers make fewer stops, use less force

Urban agriculture in Chicago does not allow consumers to rely solely on local food

Tracking COVID-19 in transmission in Chicago schools: Public health officials take data-driven approach to reopening city public schools

Beverage prices, volume sold after sweetened beverage tax repeal in Chicago's county