Incumbent Republicans Jeff Colyer and Tracey Mann lost their party's renomination in a tight primary election won by Secretary of State Kris Kobach and businessman Wink Hartman by a margin of around 0.1 percent.

State representative Scott Schwab won the Republican primary amidst a number of candidates, while Democratic nominee Brian McClendon ran unopposed after his challengers withdrew.

Incumbent Republican treasurer Jake LaTurner was appointed to the office on April 25, 2017, following the resignation of his predecessor Ron Estes to join the U.S. House of Representatives.

He ran for election to a full term, defeating his Democratic challenger State Senator Marci Francisco by 15.49 points.

Incumbent Republican Insurance Commissioner Ken Selzer retired to run for governor, leaving the seat open.