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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.

How Wealthy Investors are Making Millions Exploiting Illinois' Property Tax Law. Maps of Inequality. Debt Study - View local debt attributed to your property. 20-Year Property Tax History. Additional Studies. Your Property Tax Overview. View taxing district debt attributed to your property. Search $84 million in available property tax refunds. Search $34 million in missing exemptions going back four years.

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.

See the latest charts and maps of coronavirus cases, deaths, hospitalizations and vaccinations in Cook County, Illinois.

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