Search results
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.
Find information and services for Cook County residents, businesses and visitors. Learn about Project Rainbow, discount parking, manufacturing apprenticeships, solid waste and more.
Learn about the history, population, government and services of Cook County, the second most populous county in the nation. Cook County contains 134 municipalities, including the City of Chicago, and is governed by a 17-member Board of Commissioners.
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.
Cook County contains 134 municipalities in its region, the most well known being the City of Chicago – which is the County seat where the central offices of Cook County are located.
Learn about the population, diversity, economy, education, and health of Cook County, IL, the most populous county in Illinois and home to Chicago. See charts, maps, and data sources for various indicators and compare with other geographies.
Cook County is a county in the American state of Illinois. Chicago is the county seat of Cook County. Los Angeles County, California is the only county with a higher population than Cook County. About 5,276,000 people live in Cook County. This is 41 percent of all the people who live in Illinois. Cook County's population is more than the ...
