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Cook County Illinois ☎ +1 312-443-5500 Last Updated: 06/18/2025 |
| 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. More than 40 percent of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541. The county seat is Chicago, the most populous city in Illinois and the third most populous city in the United States. | |
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Illinois Place » City Illinois is a state in the Midwestern region of the United States. The population was 12,812,508 in 2020. Its largest urban areas include Chicago and the Metro East of Greater St. Louis, as well as Peoria, Rockford, Champaign–Urbana, and Springfield, the state's capital. 198 views 💖 1 👍 0The United States |