Results of the 2018 United States House of Representatives elections in Oklahoma by district:[2] Vacant Kevin Hern Republican 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.

[4] Markwayne Mullin Republican Markwayne Mullin Republican 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.

During the 2016 campaign, Mullin stated he was reassessing his pledge, and refused to rule out running again in 2018.

Tom Cole Republican Tom Cole Republican 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 Steve Russell, who had represented the district since 2015, ran for re-election.