Republicans in eastern and southern Collier County selected incumbent commissioner Jim Coletta by a margin of nearly 2 to 1.
Coletta will now face Democrat Russell Kish in the Nov. 4 partisan election.
Coletta received about 66 percent compared to challenger Roberto “Bob” Alonso, who received about 34 percent.
More than 13,800 Republicans were eligible to vote in the primary. There are 32,850 total registered voters in the district.
Seeking his third term of office, Coletta is the former business owner of a meat plant, newspaper and equipment retail store.
He campaigned on his record for the past eight years — noting District 5 cuts a wide swath from Everglades City through Golden Gate Estates to Immokalee -- as an advocate for the underprivileged, better roads, improved drainage and sensible flood insurance maps.