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. Ballotpedia He is a second-term incumbent and a lifelong Nampa resident.

2024 Primary Election Results Cornilles 2,662 votes / Bell 1,812 votes

2024 General Election Results Cornilles 17,076 votes

Background

Jeff Cornilles is a fourth-generation Idaho native who attended Nampa High School and the University of Idaho. Wikipedia 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. Ballotpedia

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. Idaho State Legislature In his 2022 Ballotpedia candidate survey, Cornilles described serving on the board of the first charter school in Idaho and founding the Pix Theater Foundation, which 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. Ballotpedia

In the 2024 Republican primary, Cornilles defeated challenger Jarome Bell with 59.5 percent of the vote to Bell’s 40.5 percent. He then ran unopposed in the November 2024 general election, receiving 17,085 votes. Ballotpedia

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. Idaho State Legislature 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 the first-ever Canyon County Pride Festival held in Nampa in June 2024. 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 gave special accommodation for a planned Chobani expansion in Twin Falls. BoiseDev Critics of that bill, including Cornilles, argued that urban renewal districts deprive taxing districts of property tax revenue.

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. He stated in his 2022 survey that he supports teachers and the work they do on a daily basis.

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 notably distinct from many in the activist wing of the Idaho GOP. 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, which he noted comprise the third-largest tract in the lower 48 states, open and accessible.

Political Alignment

Jeff Cornilles appears most consistently aligned with the Traditional Conservative Republican classification. His documented positions on property tax, growth management, urban renewal, public lands, and fiscal policy place him within the governing-conservative tradition represented by the rural establishment wing of the Idaho Republican Party. His 2025 vote against the Monks urban renewal bill, opposing what critics characterized as developer-friendly policy at the expense of local taxing districts, is consistent with the kind of property-rights-oriented fiscal conservatism associated with organizations such as the Idaho Cattlemen’s Association and the Idaho Majority Club rather than with the activist right.

His 2025 Idaho Freedom Foundation Freedom Index score of 61.6 percent, a D-minus by the IFF’s own grading scale, places him well below the threshold the IFF associates with conservative fidelity, and is consistent with a legislator in the mainstream establishment Republican mold rather than the activist or freedom-caucus wing. His IFF Spending Index score for the same session was 17.4 percent, an F by their scale. These scores indicate a pattern of voting that diverges substantially from the IFF’s preferred positions.

No documented affiliations with the Idaho Freedom Foundation, Idaho Freedom Caucus, Citizens Alliance of Idaho, Idaho Gang of Eight, or the Idaho Family Policy Center were identified during research. No endorsements from Greg Pruett or John Heida were identified. Ballotpedia did not record any endorsements for Cornilles in either his 2024 or 2026 campaigns as of the date of this profile.

Campaign and Endorsements

Cornilles declared his candidacy for the 2026 Republican primary, which is scheduled for May 19, 2026. BallotpediaHis campaign website is active. Ballotpedia has not recorded any formal endorsements for Cornilles in the 2026 cycle as of this writing. In a prior cycle, Cornilles signed a U.S. Term Limits pledge, as documented by Ballotpedia.

FAQ

Who is Jeff Cornilles, Idaho? Jeff Cornilles is a Republican member of the Idaho House of Representatives representing District 12A, which covers the Nampa area. He is a fourth-generation Nampa native, small business owner, and financial services professional first elected in 2022.

What district does Jeff Cornilles represent? Cornilles represents House District 12A, based in Nampa, Canyon County, Idaho.

Is Jeff Cornilles an incumbent or challenger? Cornilles is an incumbent seeking his third term. He is running in the May 19, 2026, Republican primary.

What committees does Jeff Cornilles serve on? In the 2025-2026 legislative session, Cornilles serves on the House Business Committee, the Local Government Committee (as Vice Chair), and the Revenue and Taxation Committee.

What has Jeff Cornilles accomplished in the Idaho Legislature? Cornilles has focused primarily on tax and local government issues. He serves as Vice Chair of the Local Government Committee and sits on the Revenue and Taxation Committee. He sponsored legislation in 2025 addressing Idaho’s indecent exposure statute and voted against an urban renewal reform bill, citing concerns about the fiscal impact on local taxing districts.

Profile published by IdahoVoters.com. Last updated April 2026. This profile will be updated as additional information becomes available.