Logan County, Oklahoma

Associate District Judge, Logan County

2 candidates are tracked for Associate District Judge, Logan County on the November 3, 2026 ballot: Sierra Pfeiffer and Diane Vaughan. Candidate information follows official Logan County election filings; verify with the official election office linked below.

About this race

Elected by the voters of Logan County, so this race is on every November 3, 2026 ballot there. District lines are set by Title 20 of the Oklahoma Statutes and the State Election Board candidate list.

What this office does

Trial court judge. A trial judge presides over criminal and civil cases at the first level: bail and pleas, motions, trials, sentencing and civil judgments. Judges are bound by state law and appellate precedent and are barred by judicial conduct rules from campaigning on how they would rule. Most states elect trial judges on a nonpartisan ballot; the term and the courts a judge may sit on vary by state.

This race. Nonpartisan: candidates appear without party labels.

Oklahoma › Logan County › Associate District Judge, Logan County

Sierra Pfeiffer

Nonpartisan

Top priorities

Says she will apply the law as written, without activism or bias.
Emphasizes public safety and swift handling of probation-violation cases.

Per the campaign site.

Biography

Sierra Pfeiffer is Deputy General Counsel for the Oklahoma State Bureau of Investigation, per her campaign site. She has 13 years of experience in Oklahoma's criminal justice system, including as a Logan County assistant district attorney, and earned her law degree with honors from the University of Oklahoma College of Law, per the same source.

Campaign site (opens in a new tab)

Diane Vaughan

Nonpartisan

Top priorities

Campaigns on upholding the Constitution and rule of law by deciding cases on facts and evidence.
Says she will ensure litigants and victims are treated with dignity throughout the judicial process.

Per the campaign site.

Biography

Diane Vaughan currently serves as Logan County's associate district judge after being sworn in to the post following a vacancy, per Guthrie News Page. She spent nearly eight years as an assistant district attorney in Payne and Logan counties and nearly 21 years in the Air National Guard, retiring as an assistant staff judge advocate after two Middle East deployments, per her campaign site.

Campaign site (opens in a new tab)

Next on your ballotLogan County Assessor

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Voting info and more

Questions about this race

Who is running for Associate District Judge, Logan County in 2026?

When is the Associate District Judge, Logan County election in Oklahoma?

Election Day is Tuesday, November 3, 2026. Registration deadlines, early voting dates and mail ballot rules for Oklahoma are on the Oklahoma election hub at theballotbrief.com.

How do I see my exact Logan County ballot?

Enter your ZIP code in the lookup at theballotbrief.com for the statewide and congressional races, or a full street address to add the county, city and district contests for that location.

Verify this race

Candidate roster from official Logan County and state election office filings, last verified September 25, 2026. Bios and priorities carry their attribution inline.

Cross-check with the official Oklahoma election office, or see the full Logan County sample ballot and your exact ballot by address.

The rest of your Logan County ballot

12 tracked races in Logan County, Oklahoma. Landed here from another county's search? Look up your own ballot below.

Also on your ballot

Logan County Treasurer Logan County Commissioner District 1 Logan County Commissioner District 3 See all 12 Logan County races

Candidate profiles

Sierra Pfeiffer, full profile Diane Vaughan, full profile Official Oklahoma election office