The 4th congressional district of Illinois includes part of Cook County, and has been represented by Democrat Jesús "Chuy" García since January 2019.

Jesús G. "Chuy" García is an American politician serving as the U.S. representative for Illinois's 4th district since 2019. A member of the Democratic Party, he served on the Cook County Board of Commissioners, as well as in the Illinois Senate and on the Chicago City Council before his election to Congress. He was also a candidate for mayor of Chicago in 2015 and 2023. Throughout his career in Chicago and national politics, he has been described as a progressive.