Final answer:
The state of Illinois has nine Supreme Court justices. The Court consists of one chief justice and eight associate justices who serve lifetime terms.
Step-by-step explanation:
The state of Illinois has nine Supreme Court justices.
The original court in 1789 had six justices, but Congress set the number at nine in 1869, and it has remained there ever since. There is one chief justice, who is the lead or highest-ranking judge on the Court, and eight associate justices. All nine serve lifetime terms, after successful nomination by the president and confirmation by the Senate.