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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.

Location Phone. (312) 603-5656. Mission The Cook County Clerk is the chief election officer for Cook County. The Clerk is also responsible for maintaining and providing vital records, various aspects of the real estate tax process, receiving and making available to the public statements of economic interests and lobbyist registration, and ...

Counties of Illinois. There are 102 counties in Illinois. The most populous of these is Cook County, the second-most populous county in the United States and the home of Chicago, while the least populous is Hardin County. The largest by land area is McLean County, while the smallest is Putnam County. Illinois's FIPS state code is 17 and its ...

Property Tax Portal. The Cook County Property Tax Portal is the result of collaboration among the elected officials who take part in the property tax system; the Portal consolidates information and delivers Cook County taxpayers a one-stop customer service website.

If you have an emergency or need immediate assistance, please call 911 or your local emergency services. For non-emergencies and general inquiries about the County, please use the information below. ‌118 N. Clark Street, Chicago, IL 60602. ‌ (312) 443-5500.

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.

In 2020, Cook County, IL had a population of 5.17M people with a median age of 37 and a median household income of $67,886. Between 2019 and 2020 the population of Cook County, IL declined from 5.2M to 5.17M, a −0.553% decrease and its median household income grew from $64,660 to $67,886, a 4.99% increase.

Table. All Topics Population Age and Sex Race and Hispanic Origin Population Characteristics Housing Families & Living Arrangements Computer and Internet Use Education Health Economy Transportation Income & Poverty Businesses Geography. Cook County, Illinois. Population Estimates, July 1, 2022, (V2022) . 5,109,292.