Butler County voters will elect a new commissioner for the first time since 2012, choosing between Republican Michael Ryan and Democrat Mike Miller on Nov. 3.

The seat opens because Commissioner Cindy Carpenter lost the Republican primary to Ryan in May. The winner will help shape county policy on property taxes, data center development and contracts with U.S. Immigration and Customs Enforcement, as first reported by WCPO. For West Chester and Liberty Township residents, the stakes are direct: the 2026 property reappraisal will raise tax bills countywide, and data center siting decisions are already reshaping both townships' zoning policies.

Ryan, a former Hamilton City Council member and vice mayor, is running on economic growth. Miller, a political newcomer and community volunteer, calls himself a citizen candidate focused on putting residents first.

Property taxes after a 19% reappraisal

The race arrives as Butler County homeowners brace for higher tax bills. Residential and agricultural property values rose a median 19% countywide in the 2026 reappraisal, according to the Butler County Auditor's Office. Commercial and industrial values climbed 20%. The new values apply to the 2026 tax year and will hit bills paid in 2027.

The county is projecting roughly $74 million in unencumbered cash reserves at the end of 2027, according to budget figures cited by WCPO.

Both candidates support rolling back the county's general-fund millage, but they disagree on what else to do with the money.

Miller said the county should not sit on reserves it does not need. "If we're not gonna use those taxpayer dollars to invest in the community, then yes, we should roll it back," he told WCPO. He also argued that rollbacks alone favor higher-value homeowners and called for more spending on infrastructure, mental health and addiction recovery.

Ryan said economic growth is the better long-term fix. He pointed to his Hamilton City Council tenure, during which his campaign claims the city added 1,400 jobs and attracted more than $700 million in capital investment. Those figures have not been independently verified.

Data centers and local control

Data center development prompted all six townships under county zoning to request a temporary ban. The Butler County Commissioners voted unanimously June 17 to impose a six-month moratorium on new data centers in Hanover, Lemon, Madison, Milford, Oxford and Ross townships.

West Chester Township's zoning code does not list data centers as a permitted use, effectively blocking construction there, according to WLWT. In Liberty Township, the Zoning Commission advanced restrictions in June that would let trustees approve or reject projects case by case. Trustee President Todd Minniear said at the June meeting that energy use, water consumption and noise are his biggest concerns.

Ryan supports the moratorium but frames the issue around local input. He told WCPO he wants township trustees and city councils involved in siting decisions and sees opportunities in aviation, given the county's location between Dayton and Cincinnati airports.

Miller opposes data centers that strain utilities or harm the environment. His platform calls for development evaluated by its impact on existing residents.

ICE contracts

The candidates split on ICE contracts. Ryan supports the county's agreements, saying he saw ICE work alongside local law enforcement during his time on Hamilton City Council. Miller opposes them, arguing most detainees are nonviolent and not from Butler County.

The six-month data center moratorium is set to expire around mid-December, and the new commissioner will likely weigh in on whether to extend it or adopt permanent rules.