County Commissioner Tim Mauck is running unopposed for the District 1 seat in Clear Creek County.
The Idaho Springs Democrat is running this year to retain the seat he won in 2010.
Write-in candidates had until April 18 to express an intent to run. An independent or unaffiliated candidate can still petition through July 10 to be on November’s general-election ballot.
Mauck and his fellow commissioners, Tom Hayden and Phil Buckland, each make an annual salary of $58,500, by state statute.