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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 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 Government, Illinois | Cook County.

Welcome to the Cook County Clerk's Office | Cook County Clerk

County Vendor Resources; Economic Development; Environmental; Permits; Roads and Transportation; Tax Center; Services by Category. Community and Family Support; Jobs and Employment; Outdoor Recreation; Pets and Animals; Property and Housing; Public Safety and Jails; Unincorporated County Services; Vital Records; Voting and Elections; Your Health; Top Business Services

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.

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

The Cook County Circuit Court is the largest court system in Illinois and the second largest unified court system in the world. Our staff is composed of more than 1,400 employees. Our primary function is to attend court sessions and make, keep, and preserve all records of the court. Currently, we have approximately 24 million case files, of which 3.9 million are active case files.