Geographic Region: Congressional Districts

After each decennial census conducted by the U.S. Census Bureau, the congressional districts for each state are redrawn. The new districts are the basis for the next general election, and they take effect in the Congress after that election. (For example, the latest decennial census was conducted in 2020. The new districts were redrawn in 2021, and they were used as the basis for the general election in November 2022. They took effect with the beginning of the next Congress in January 2023.)

After the 2020 Census, Illinois lost one district..

Source of definition: U.S. Census Bureau

Below find the two most recent congressional district maps for Illinois. The districts change boundaries only after each decennial Census (every 10 years).