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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.
As the seat of Cook County, the second-most populous county in the U.S., Chicago is the center of the Chicago metropolitan area, often colloquially called "Chicagoland" and home to 9.6 million residents.
On May 7, 1831, Cook County elected its first officials.Cook County is an urban county in the upper northeastern section of the State of Illinois that contains more than 800 local governmental units within its boundaries.
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Board of Commissioners
The Cook County Board of Commissioners is the county's legislative body. It made up of 17 commissioners who are elected by district for four-year terms. The county board sets policy and laws for the county regarding property, public health services, public safety, and maintenance of county highways. It is presided over by the County Board President, currently Toni Preckwinkle.
Sheriff
The Cook County Sheriff's Office is the sheriff. All Cook County Sheriff's Deputies have police powers regardless of their particular job function or title. Like other Sheriffs' departments in Illinois, the Sheriff can provide all traditional law-enforcement functions, including county-wide patrol and investigations irrespective of municipal boundaries, even in the city of Chicago, but has traditionally limited its police patrol functions to unincorporated areas of the county. The Cook County...
State's Attorney
The Cook County State's Attorneyhandles criminal prosecutions.
Cook County is the fifth largest employer in Chicago. In March 2008, the County Board increased the sales tax by one percent to 1.75 percent. This followed a quarter-cent increase in mass transit taxes. In Chicago, the rate increased to 10.25 percent, the steepest nominal rate of any major metropolitan area in America. In Evanston, sales tax reache...
The Cook County Democratic Party represents Democratic voters in 50 wards in the city of Chicago and 30 suburban townships of Cook County. The organization has dominated County, city, and statepolitics since the 1930s. The county has by far more Democratic Party members than any other Illinois county and is one of the most Democratic counties in th...
Cook County Code from MunicodeCook 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.
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 ...
