Jeff Cornilles

Jeff Cornilles: Idaho Republican Incumbent for House District 12A

Jeff Cornilles is a Republican member of the Idaho House of Representatives serving District 12A, which covers the Nampa area of Canyon County. Cornilles assumed office on December 1, 2022, and is running for re-election in the Republican primary scheduled for May 19, 2026. He is a second-term incumbent and a lifelong Nampa resident.

Background

Jeff Cornilles is a fourth-generation Idaho native who attended Nampa High School and the University of Idaho. His career experience includes owning Cornilles Financial Services and working as its CEO, as well as working as a financial services professional with MassMutual Idaho. He has been affiliated with the Nampa Rotary Club, the Nampa Chamber of Commerce, and the Nampa Development Corporation, according to his Ballotpedia profile. Cornilles also serves on the Nampa Impact Fee Advisory Committee and serves as a commissioner on the Nampa Development Corporation, Nampa's Urban Renewal Agency. He and his wife Keriann have five children and four grandchildren, per his Idaho Legislature biography. In his 2022 Ballotpedia candidate survey, Cornilles described serving on a charter school board and founding the Pix Theater Foundation, which he said purchased and preserved the historic theater in downtown Nampa.

Political Career

Cornilles won election to the Idaho House of Representatives in November 2022 after defeating Machele Hamilton and Sebastian Griffin in the Republican primary. No opposing candidate appeared on the general election ballot, and Cornilles won unopposed with 10,053 votes. In the 2024 Republican primary, Cornilles defeated challenger Jarome Bell with 59.5 percent of the vote to Bell's 40.5 percent, as reported by the Idaho Press. Bell characterized Cornilles as insufficiently conservative, pointing to votes on a higher education appropriations bill and other measures. Cornilles defended his record and ran unopposed in the November 2024 general election, receiving 17,085 votes. In his current second term, Cornilles serves on the House Business Committee, the Local Government Committee as Vice Chair, and the Revenue and Taxation Committee, per his Idaho Legislature biography. In his first term, his committee assignments included the Resources and Conservation Committee, the Revenue and Taxation Committee, and the Joint Legislative Oversight Committee. In the 2025 session, Cornilles sponsored House Bill 270, which elaborated on Idaho's indecent exposure statute to define toplessness, including exposed female breasts and medically altered male breasts, as a misdemeanor. Cornilles stated the bill was prompted by concerns following the first-ever Canyon County Pride Festival held in Nampa in June 2024. The bill passed the House 59-8 and was signed into law. Also in 2025, Cornilles voted against HB 436, an urban renewal reform bill carried by House Majority Leader Jason Monks, which changed the rules governing urban renewal districts and included a provision allowing an extended district life for a planned Chobani expansion in Twin Falls, as reported by BoiseDev. Cornilles said the bill moved too quickly for adequate public input and argued that the Chobani provision should have been separated from the broader reforms.

Policy Positions

Cornilles's documented policy priorities center on property tax relief, fiscal conservatism, parental rights in education, and Second Amendment protections. In his 2022 Ballotpedia candidate survey, he stated that property tax relief was among his highest priorities, arguing that homeowners on fixed incomes were being forced from paid-off homes due to rising assessments, and called for restoring and expanding the homeowners exemption beyond the $125,000 level then in effect. He also advocated that local impact fees be increased so that growth pays for growth, rather than passing costs to existing residents. On education, Cornilles has expressed support for parental rights and has consistently supported school choice mechanisms, including his prior service on a charter school board. In the 2024 session, as a member of the Revenue and Taxation Committee, Cornilles voted to hold House Bill 447 in committee, effectively blocking a $50 million private school tuition tax credit program. He told the Idaho Press that while he supports education choice, he was cautious about moving too quickly on private school funding without knowing the full consequences. Cornilles identified himself as pro-life in his 2022 survey and stated he would work to support legislation protecting the lives of unborn children and making adoption easier for families. He also stated that the First and Second Amendments were under federal threat and described himself as a gun owner, hunter, and NRA member who would oppose federal overreach on firearms. On public lands, Cornilles has expressed a position aligned with conservation-oriented sportsmen's groups. In his 2022 survey, he identified as a member of Backcountry Hunters and Anglers and stated he would work to keep Idaho's public lands open and accessible for future generations.

Political Alignment

Jeff Cornilles is a Traditional Conservative Republican. His positions on property tax, growth management, urban renewal, public lands, and fiscal policy reflect conservative Republican governance without documented ties to activist organizations. His 2024 endorsements from the Idaho Fraternal Order of Police, the Professional Firefighters of Idaho, the Idaho Farm Bureau, and the Idaho Association of Realtors are consistent with that classification. His 2025 vote against the Monks urban renewal bill, on grounds that it moved too quickly and benefited a single large manufacturer at the expense of local taxing districts, reflects the property-rights-oriented fiscal conservatism that has characterized his legislative record. His 2024 primary challenge from a self-described "America First" candidate, who criticized him from the right on multiple votes, further illustrates the distance between Cornilles and the activist wing of the Idaho Republican Party.

Campaign and Endorsements

Cornilles declared his candidacy for the 2026 Republican primary, scheduled for May 19, 2026. His endorsers have included the Idaho Association of Commerce and Industry, the Idaho Farm Bureau, the Professional Firefighters of Idaho, the Idaho Association of Realtors, and the Idaho Fraternal Order of Police. In a prior cycle, Cornilles signed a U.S. Term Limits pledge, as documented by Ballotpedia. Campaign finance records are available through the Idaho Secretary of State's Sunshine database.