Cook County, Illinois

County in Illinois, United States

Cook County, Illinois (Under CC License)

Cook County is a county in the U.S. state of Illinois. It is the second-most populous county in the United States after Los Angeles County, California. As of 2017, the population was 5,211,263. Its county seat is Chicago, the largest 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.

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