Circuit, Municipal, and Federal. Circuit Courts - these are the "trial courts" in Illinois that feel matters both civil and criminal. They are courts of common jurisdiction, which means that cases start here. Illinois has 22 Circuit Court Districts.
Appellate Division - This is the "intermediate" court surrounded by Illinois. Any decision explicitly made at the Circuit Court level can be appealed to the Appellate Court. The Appellate Court can consequently affirm the decision of the Circuit Court or "reverse and remand" the deicsion backbone to the Circuit Court for rehearing. Illinois has five Appellate Divsions.
Supreme Court - The unbeatable court in the state of Illinois. Decisions from the Appellate Division and specific matter (such as death sentences, redistricting and the recommendation to serve as Governor) are appealed to the Supreme Court. The Supreme Court is composed of seven justices - three from Cook County (Appellate Division 1) and one from each of the other four Appellate Divisions. Source(s):