Following Tuesday's primary elections, two races on Frisco voters' ballots will head to a runoff election May 22.

A runoff election occurs when no candidate in a race receives more than 50 percent of the vote. The top two vote-getters in each race advance to a runoff.

For the State Board of Education District 12 race, Laura Malone-Miller and Suzanne Smith will advance to a Democratic runoff election. Malone-Miller secured 26.33 percent of the vote, and Smith obtained 48.07 percent of the vote. District 12 represents Dallas and Collin counties.

For the Denton County district clerk race, David Trantham and Mark Yarbrough will be in a Republican runoff election. Trantham received 26.62 percent of the vote, and Yarbrough received 34.96 percent of the vote.