John Trenshaw beat incumbent John Glavin for the Osage County First District commissioner seat Tuesday.
Trenshaw received 882 votes - 63.64 percent - while Glavin received 438 votes - 31.6 percent, according to the unofficial election results.
Trenshaw has said his top goal is to create an environment where the county operates like a business, making enough money to cover expenses but also enough to put toward future projects and savings.
While he is currently semi-retired and operates a farm, Trenshaw worked in construction for several years, developing an apartment complex and hotel in Linn.
Glavin was running for his third term as commissioner.
For the contested Osage County coroner race, A.J. Probst received 1,526 votes - 50.92 percent - while Russ Lumpkin received 1,256 votes - 41.91 percent, according to the unofficial election results.
After working as an investigator in the U.S. Army for a few years, Probst has said, he wants to bring compassion and investigative experience to the coroner position and doesn't plan to make major changes to the office.
Several candidates in Osage County's Republican primary election ran unopposed: Larry Kliethermes for Second District commissioner, Michael Bonham for sheriff, Jerry Baker for assessor and Paul Stratman for public administrator.
In the Democratic primary, Tim Hamburg ran unopposed for Osage County surveyor and won.
Osage County primary winners will not face opposition in the November general election.