2018 Jefferson County, Missouri Executive election

2018 Jefferson County, Missouri Executive election
November 6, 2018
 
Nominee Dennis Gannon Jeff Roorda
Party Republican Democratic
Popular vote 50,713 36,220
Percentage 58.34% 41.66%

County Executive before election

Ken Waller
Republican

Elected County Executive

Dennis Gannon
Republican

The 2018 Jefferson County, Missouri Executive election took place on November 6, 2018. Incumbent County Executive Ken Waller declined to run for re-election to a third term, instead opting to run for County Clerk. Businessman Dennis Gannon, the former President of the County Port Authority, won the Republican primary over sheriff's deputy Gary Stout, and faced former State Representative Jeff Roorda, the Democratic nominee, in the general election. Gannon defeated Roorda by a wide margin, winning 58 percent of the vote.