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Polk County Supervisor Matt McCoy has lost his bid for re-election.
Former State Representative John Forbes defeated McCoy in the Democratic primary for the District 1 seat on Tuesday night.
In the District 4 Democratic primary, Des Moines City Councilman Joe Gatto appears to have narrowly lost his bid for the Board of Supervisors to Heather Jones-Brown by less than 100 votes.
Iowa State Senator Izaah Knox won the Democratic primary for the District 5 board seat.
Republicans didn't field any primary candidates, but can fill ballot vacancies through party conventions before the Aug. 26 deadline.