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Cook County, Illinois

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Cook County, Illinois
CountyCook County
StateIllinois
Founded1831
SeatChicago
Largest cityChicago
Area total sq mi1635
Area land sq mi945
Area water sq mi690
Population as of2020
Population total5,275,541
Population density sq mi5582
Time zoneCentral
Named forDaniel Pope Cook
District1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th

Cook County, Illinois is the most populous county in the U.S. state of Illinois and the second-most populous county in the United States, after Los Angeles County, California. Its county seat is Chicago, the third-largest city in the nation. Encompassing over 1,600 square miles, it is a central hub for Midwestern commerce, culture, and government, anchored by the Chicago Loop and O'Hare International Airport.

History

The region was originally inhabited by the Potawatomi, Miami, and other Algonquian peoples. Following the Treaty of St. Louis (1816), the area was opened for American settlement. Cook County was created in 1831 from Putnam County and named for Daniel Pope Cook, an early Illinois Territory politician and newspaper publisher. The Great Chicago Fire of 1871 was a pivotal event that led to massive reconstruction and innovation, cementing Chicago's role as a national transportation and architectural leader. The 20th century saw profound demographic shifts during the Great Migration, the political rise of Richard J. Daley's Chicago Democratic machine, and significant events like the 1968 Democratic National Convention and the World's Columbian Exposition.

Geography

According to the U.S. Census Bureau, the county has a total area of 1,635 square miles, of which 945 square miles is land and 690 square miles is water, largely from Lake Michigan. It borders Lake County to the north, Will and DuPage counties to the west, and Lake Michigan to the east. The Chicago River and its branches flow through the urban core, while the Des Plaines River runs along its western edge. Notable geographic features include the Indiana Dunes National Park, which extends into the county's southeast, and the extensive forest preserves managed by the Forest Preserve District of Cook County.

Demographics

As of the 2020 United States Census, the population was 5,275,541. The racial makeup is diverse, with significant populations of non-Hispanic White, Black or African American, Hispanic or Latino, and Asian residents. Major ethnic enclaves include Pilsen, Chinatown, and Devon Avenue. The county is a primary destination for immigrants, with large communities from Poland, Mexico, India, and the Philippines. Religious institutions are prominent, including the Archdiocese of Chicago, the Baha'i House of Worship in Wilmette, and numerous Jewish synagogues.

Government

Cook County operates under a commission form led by a Board of Commissioners and a Board President. Key offices include the Cook County State's Attorney, the Cook County Sheriff, and the Clerk of the Circuit Court of Cook County. The Cook County Health system operates Stroger Hospital and a vast network of clinics. The county's judicial power is vested in the Circuit Court of Cook County, one of the largest unified court systems in the world. It is part of multiple congressional districts and is a Democratic stronghold in presidential elections.

Economy

The county boasts a massive and diversified economy, serving as the corporate headquarters for global giants like Boeing, McDonald's, and United Airlines. The Chicago Board of Trade and the Chicago Mercantile Exchange are pillars of global futures trading. Major sectors include finance, centered in the LaSalle Street corridor; manufacturing; healthcare, led by the Northwestern Memorial and Rush University Medical Center systems; and technology, with hubs in the Fulton Market District and 1871. O'Hare International Airport is a critical international logistics and travel nexus.

Culture and recreation

The county is a world-class cultural destination, home to institutions like the Art Institute of Chicago, the Field Museum of Natural History, and the Chicago Symphony Orchestra. Its architectural legacy, from the Willis Tower to works by Frank Lloyd Wright, is celebrated globally. The Chicago Park District maintains thousands of acres of green space, including Lincoln Park and Grant Park, site of the annual Lollapalooza festival. Professional sports are integral, with teams such as the Chicago Bears, Chicago Cubs, and Chicago Bulls. The Brookfield Zoo and the Chicago Botanic Garden offer major suburban attractions.

Category:Cook County, Illinois Category:Illinois counties Category:1831 establishments in Illinois