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About Cook County, Illinois

cookcountyil.gov

Cook County is the local government for Cook County, Illinois — a jurisdiction of 134 municipalities whose county seat and central offices are located in the City of Chicago. It delivers a wide range of public services and programs including public health and hospitals, courts and corrections, property and tax administration, social services, public works, and emergency management. The county is governed by an elected Board of Commissioners and operates numerous departments and agencies that provide resources, data, permitting and online services to residents, businesses, and partner municipalities.