The 17th congressional district of Illinois is represented by Democrat Eric Sorensen. It includes most of the northwestern portion of the state, with most of its population living on the Illinois side of the Quad Cities, as well as parts of Peoria and Rockford.

Cheryl Lea Bustos is an American journalist, healthcare executive, and politician who served as the U.S. representative from Illinois's 17th congressional district from 2013 to 2023. A member of the Democratic Party, she is the first woman elected to Congress from her district in the northwestern part of the state, anchored by the Illinois side of the Quad Cities and partially including Peoria and Rockford. In 2019, Bustos became chair of the Democratic Congressional Campaign Committee (DCCC).