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  1. Find information and services for Cook County residents, businesses and visitors. Learn about Project Rainbow, discount parking, manufacturing apprenticeships, solid waste and more.

  2. 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.

  3. Learn about the history, population, government and services of Cook County, Illinois, the second most populous county in the nation. Find out how Cook County is governed by a 17-member Board of Commissioners and a County Board President.

  4. Learn about the mission, mandates and key activities of the Cook County Clerk, the chief election officer and vital records keeper for Cook County. Find information on property tax, economic interests, lobbyist registration, County Board and more.

  5. 3 days ago · Explore the population changes, racial and ethnic makeup, age distribution, and migration patterns of Cook County, IL from 2010 to 2022. See how the county ranks among other counties and states in the US and compare the data sources and methods.

  6. Cook County, Illinois has 944.9 square miles of land area and is the 6th largest county in Illinois by total area. Topics in the Cook County, Illinois data profile include: Populations and People; Income and Poverty; Education; Employment; Housing; Health; Business and Economy; Families and Living Arrangements; Race and Ethnicity.

  7. The government of Cook County, Illinois, is primarily composed of the Board of Commissioners, other elected officials such as the Sheriff, State's Attorney, Treasurer, Board of Review, Clerk, Assessor, Cook County Circuit Court judges and Circuit Court Clerk, as well as numerous other officers and entities.

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