Democrat Chuy Garcia has beaten Mark Lorch, a Republican, in the race for the House seat representing Illinois' 4th Congressional District, currently held by Democrat Luis V. Gutiérrez.
With all precincts reporting, Garcia has 86.6 percent of the vote, followed by Lorch with 13.4 percent.
Gutiérrez has represented the district in the House since 1993.
Democrats have gained a majority in the House, with 235 seats in the next Congress. All of Illinois's House seats have been decided; two switched hands, all going to Democrats.
The number of votes cast for Democrats in House races has increased 55.0 percent from the 2014 midterms, compared with an increase of 25.6 percent for Republicans.
The district went for Democrat Hillary Clinton in 2016 by a margin of 68.3 points. Clinton won Illinois by 16.9 points.
Data is from the Associated Press. This story may be updated if more information becomes available. It is powered by Heliograf, The Post's artificial intelligence system.