The 2018 United States House of Representatives elections in Oklahoma were held on November 6, 2018, to elect the five U.S. representatives from the state of Oklahoma, one from each of the state's five congressional districts. The elections coincided with other elections to the House of Representatives, elections to the United States Senate and various state and local elections. Primary elections were held on June 26 and runoff elections were held two months later on August 28. The state's U.S. House delegation Republican majority changed from 5âÂÂ0 to 4âÂÂ1. As of 2025, this is the only time since 2010 that Democrats won any house race in Oklahoma.
Results of the 2018 United States House of Representatives elections in Oklahoma by district:
The 1st district is located in the Tulsa metropolitan area and includes Creek, Rogers, Tulsa, Wagoner and Washington counties. Incumbent Republican Jim Bridenstine, who had represented the district since 2013, resigned on April 23 to become NASA Administrator. He was re-elected unopposed in 2016. The district had a PVI of R+17.
During his initial election in 2012, Bridenstine self-imposed a three term limit. Bridenstine confirmed that he would honor his term-limit pledge.
Bridenstine became Administrator of NASA in the Donald Trump administration, and resigned on April 23.
The 2nd district is located in the regions of Green Country and Kiamichi Country and includes the city of Muskogee and numerous sparsely populated counties. The incumbent was Republican Markwayne Mullin, who had represented the district since 2013. He was re-elected with 71% of the vote in 2016.
Mullin had pledged to serve only three terms when he was first elected in 2012. During the 2016 campaign, Mullin stated he was reassessing his pledge, and refused to rule out running again in 2018.
The 3rd district is located in Western Oklahoma. The largest district in Oklahoma and one of the largest in the country, it includes the Oklahoma Panhandle, Ponca City and the city of Stillwater as well as the Osage Nation. Incumbent Republican Frank Lucas, who had represented the district since 2003 and previously represented the 6th district from 1994 to 2003, ran for re-election. He was re-elected with 78% of the vote in 2016. The district had a PVI of R+27.
The 4th district is located in South Central Oklahoma and includes the suburbs of Oklahoma City, such as the counties of Canadian, Comanche and Cleveland and numerous other sparsely populated counties. Incumbent Republican Tom Cole, who had represented the district since 2003, ran for re-election. He was re-elected with 70% of the vote in 2016. The district had a PVI of R+20.
The 5th district is located in Central Oklahoma and centered around the state capital, Oklahoma City, and the surrounding areas such as Edmond and Shawnee. Incumbent Republican Steve Russell, who had represented the district since 2015, ran for re-election. He was re-elected with 57% of the vote in 2016. The district had a PVI of R+10. Democrat Kendra Horn won by a margin of 1.4% in what was considered an upset.
Official campaign websites for first district candidates
Official campaign websites for second district candidates
Official campaign websites for third district candidates
Official campaign websites for fourth district candidates
Official campaign websites for fifth district candidates