Oklahoma's District Five race ended in an upset, with Democrat challenger Kendra Horn defeating Republican incumbent Steve Russell. Horn won with 50.69% of votes, gaining her margin in absentee and early votes.
Republican Kevin Hern will fill the vacant District One seat, defeating Democrat Tim Gilpin. The seat was vacated by Jim Bridenstine, who is now running NASA. Hern won with just over 59% of votes.
"I think it's an opportunity to do what we're seeing happen right now, [putting] Americans back to work" Hern said. "What we're seeing is the greatest job growth we've seen, probably in the history of our country."
The District Two race was the most crowded in Oklahoma, with Republican incumbent Markwayne Mullin comfortably winning with 65% of votes.
In District Three, House veteran Frank Lucas will return for his ninth term, receiving nearly 74% of votes.
Republican incumbent Tom Cole received 63% of votes on his way to securing the District Four victory.