Current members Oklahoma's 1st district: Kevin Hern (R) (since 2018) Oklahoma's 2nd district: Markwayne Mullin (R) (since 2013) Oklahoma's 3rd district: Frank Lucas (R) (since 1994) Oklahoma's 4th district: Tom Cole (R) (since 2003) Oklahoma's 5th district: Kendra Horn (D) (since 2019)