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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.
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.
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.
2026 priorities
- Says the county retired all of its debt and earned a top AAA bond rating from Moody's Ratings during his tenure, per Journal-News, reporting on his primary campaign
- Supports keeping taxes low and promoting business development, and has advocated for property tax relief for residents, per Journal-News
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.
2026 priorities (per the campaign site)
- 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
Source: candidate campaign site, roster verified 2026-09-09.
Campaign site →
Katherine Bowles is a Lebanon, Ohio resident and a former Republican now running as the Libertarian candidate for Warren County commissioner, per the Journal-News. No campaign website or questionnaire response was found as of September 9, 2026; the official election filing is the only verifiable source for Katherine Bowles.
