The Illinois General Assembly is the legislature of the U.S. state of Illinois. It has two chambers, the Illinois House of Representatives and the Illinois Senate. The General Assembly was created by the first state constitution adopted in 1818. As of 2022, the current General Assembly is the 102nd.

Under the Illinois Constitution, since 1983 the Senate has had 59 members and the House has had 118 members. In both chambers, all members are elected from single-member districts. Each Senate district is divided into two adjacent House districts.

The General Assembly meets in the Illinois State Capitol in Springfield, Illinois. Its session laws are generally adopted by majority vote in both houses, and upon gaining the assent of the Governor of Illinois. They are published in the official Laws of Illinois.

Two future presidents of the United States, Abraham Lincoln and Barack Obama, began their political careers in the Illinois General Assembly–– in the Illinois House of Representatives and Illinois Senate, respectively.

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The Judiciary of Illinois is the unified court system of Illinois responsible for applying the Constitution and law of Illinois. It consists of the Supreme Court, Appellate Court, and circuit courts. The Supreme Court oversees the administration of the court system.

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The Government of Illinois, under Illinois’ Constitution, has three branches of government: Executive, Legislative, and Judicial. The State’s executive branch is split into several statewide elected offices, with the Governor as chief executive and head of state, and has numerous departments, agencies, boards and commissions. Legislative functions are granted to the General Assembly, a bicameral body consisting of the 118-member House of Representatives and the 59-member Senate. The judiciary is composed of the Supreme Court of Illinois and lower courts.

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