Who is running for Adams County Commissioner, District 4 in 2026?
Here are the candidates for Adams County Commissioner, District 4 on the November 3, 2026 ballot. This race is on the ballot for voters in Adams County.
Positions come only from each candidate's own votes, official actions, statements and questionnaire answers, never from party labels. Every item links to its source.
Joseph P Domenico
RepublicanCandidate for Adams County Commissioner, District 4
Joseph Domenico is the Republican nominee for Adams County Commissioner, District 4, in the November 2026 election1. He was the Republican nominee for the same seat in 2022 and lost to incumbent Steve O'Dorisio, 43.1 to 56.9 percent2.
Karen DeAguero
DemocratEnvironmental engineer and nonprofit leader (self-described)
Karen DeAguero is the Democratic nominee for Adams County Commissioner, District 4, on the November 2026 ballot1. She was one of two Democrats on the county's June 30, 2026 primary ballot, with Tyler Quick3. In the Colorado Politics primary Q&A she describes herself as an environmental engineer and nonprofit leader focused on increasing civic participation and accountability2. She faces Republican Joseph Domenico in November1.
Last reviewed 2026-10-08. Spotted something wrong? Every claim links to its source so you can check it yourself.