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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% of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541.

Cook County is the largest and most populous county in Illinois and the center of the Chicago metro area, or Chicagoland. In addition to the exciting attractions of Chicago, Cook County is known for its beautiful scenery and outdoor recreation from its forest preserves, golf courses, and lake fishing to Lake Michigan with beach volleyball, kayaking, boating, and paddleboarding.

CCAO Datasets on Cook County Data Portal; Data Dashboards; Search . Search by address; Search by Neighborhood; Property Details; Find Comparable Properties; Enter 14-digit PIN; 10-digit PIN search; 8-digit PIN search; Search by appeal/attorney; All Forms & Tools . All Forms; Assessment by Legal; Divisions & Consolidations; Farms; Flood and Disaster Areas

Cook County is home to more than five million residents, roughly 45% of Illinois’ population and provides a range of vital services and programs that enhance the quality of life for residents across the region. These services range from health care to urban planning. Cook County is committed to empowering its employees to bring our constituents the best that public service has to offer.