The Ballot Brief
Warren County, Ohio

Warren County Commissioner

3 candidates are tracked for Warren County Commissioner on the November 3, 2026 ballot: Tom Grossmann, Ian Logan and Katherine Bowles. Candidate information follows official Warren County election filings; verify with the official election office linked below.

About this race

The lone contested countywide race on the November 3, 2026 Warren County ballot, per the Journal-News. Incumbent Republican Tom Grossmann won the May 5, 2026 Republican primary over Lebanon Mayor Mark Messer with 61.66% of the vote, per the Journal-News; he faces Democrat Ian Logan and Libertarian Katherine Bowles, both unopposed in their own primaries, in November.

What this office does

County commissioner. The county board is the county's legislative and, in most states, executive body. Commissioners adopt the county budget and property tax rate, oversee roads, the jail, public health, planning and zoning in unincorporated areas, and appoint or confirm department heads. In counties with an elected county executive or judge, the board's role is mainly the budget and ordinances.

Ohio › Warren County › Warren County Commissioner

Tom Grossmann

Republican

Top priorities
  • Says the county retired all of its debt and earned a top AAA bond rating from Moody's Ratings during his tenure
  • Supports keeping taxes low and promoting business development, and has advocated for property tax relief for residents

Per Journal-News, reporting on his primary campaign.

Biography

Tom Grossmann is a lawyer who was an equity partner at Taft, Stettinius & Hollister for 27 years and previously worked as an assistant general counsel for Montedison in Italy, per his campaign site. He served on Mason City Council from 2001-2009 and 2011-2014, including as mayor and vice mayor, and has served as Warren County commissioner since 2015, per the Journal-News.

Campaign site (opens in a new tab)
Ian Logan

Ian Logan

Democratic

Top priorities
  • Calls for ending the county's use of Flock license-plate surveillance cameras and for transparency in surveillance-related contracts
  • Wants developers to provide full accounting of infrastructure impacts, including roads, utilities, water, power and noise, as data centers expand in the county

Per the campaign site.

Biography

Ian Logan grew up in Mason, Ohio, after being born in Cincinnati, and attended Ohio State University, pausing his studies during the COVID-19 pandemic to support frontline healthcare workers, per his campaign site. He worked as an educator in a public school on Columbus's south side before completing his political science degree, per his campaign site.

Campaign site (opens in a new tab)

Katherine Bowles

Libertarian

Biography

Katherine Bowles is a Libertarian candidate from Lebanon, Ohio running for Warren County Commissioner, one of the first Libertarian candidates to seek a Warren County office, per the Journal-News. No campaign website was found as of September 27, 2026.

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Questions about this race

Who is running for Warren County Commissioner in 2026?

3 candidates are tracked for Warren County Commissioner on the November 3, 2026 ballot: Tom Grossmann, Ian Logan and Katherine Bowles. Candidate information follows official Warren County election filings; verify with the official election office linked below.

When is the Warren County Commissioner election in Ohio?

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

How do I see my exact Warren 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 Warren County and state election office filings, last verified September 27, 2026. Bios and priorities carry their attribution inline.

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

The rest of your Warren County ballot

9 tracked races in Warren County, Ohio. Landed here from another county's search? Look up your own ballot below.

Also on your ballot
Judge, Warren County Court of Common Pleas, General DivisionJudge, Warren County Court of Common Pleas, Probate and Juvenile DivisionJudge, Ohio Twelfth District Court of AppealsSee all 9 Warren County races
Candidate profiles
Tom Grossmann, full profileIan Logan, full profileKatherine Bowles, full profileOfficial Ohio election office