Rep. Steve Russell, a Republican, has lost a bid for reelection in Oklahoma's 5th Congressional District to Kendra Horn, a Democrat.
With all precincts reporting, Horn has 50.7 percent of the vote, followed by Russell with 49.3 percent.
Russell has represented the district in the House since 2015.
Democrats have gained a majority in the House, with 235 seats in the next Congress. All of Oklahoma's House seats have been decided; one switched hands, 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 President Trump, a Republican, in 2016 by a margin of 13.7 points. Trump won Oklahoma by 36.4 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.