The Circuit Court of Cook County is the largest of the 22 circuits in Illinois as well as one of the largest unified court systems in the world. It was created by a 1964 amendment to the Illinois Constitution which reorganized the courts of Illinois. The amendment effectively merged the often confusing and overlapping jurisdictions of Cook County's 161 courts into one uniform and cohesive court of general jurisdiction. More than 2.4 million cases are filed every year. To accommodate its vast caseload, the Circuit Court of Cook County is organized into three functional departments: County, Municipal and Juvenile Justice and Child Protection. - Source: Wikipedia