Cook County 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. As of 2019, the population was 5,150,233. Its county seat is Chicago, the most populous city in Illinois and the third-most-populous city in the United States. More than 40% of all residents of Illinois live in Cook County.
Cook County was incorporated in 1831 and named for Daniel Pope Cook, an early Illinois statesman. It achieved its present boundaries in 1839. During the first half of the 20th century it had the absolute majority of Illinois's population.
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