Jeff Cornilles

Jeff Cornilles: Idaho Republican Incumbent for House District 12A

Jeff Cornilles is a Republican member of the Idaho House of Representatives representing District 12A, which covers portions of Gem and Payette counties. Cornilles is running for re-election in 2026 and faces no Republican primary challenger as of April 2026, per Ballotpedia. He was first elected to the Idaho House in 2020.

Background

Cornilles lives in the Gem or Payette County area. He has a background in agriculture and has been involved in conservative Republican politics in western Idaho. As of April 2026, limited additional biographical detail has been published in major news outlets.

Political Career

Cornilles was first elected to the Idaho House in 2020 and re-elected in 2022 and 2024. He serves on the House Agricultural Affairs and Environment, Energy and Technology committees, per his Idaho Legislature member page. Cornilles has supported agricultural interests, natural resource management, and conservative positions on energy and environmental regulation. Through his Agricultural Affairs committee assignment, he has been involved in legislation affecting Idaho's farming and ranching sector. Through his Environment, Energy and Technology assignment, he has been involved in energy policy and environmental regulation debates. In the 2025-2026 period, Cornilles supported measures expanding firearms preemption and legislation asserting state authority over federal lands and natural resources. He also participated in oversight of Idaho's water rights and agricultural water use.

Policy Positions

On agriculture, Cornilles has supported legislation protecting Idaho's farming and ranching sector, including water rights, crop insurance, and limitations on regulations that burden agricultural operations. On energy and environment, Cornilles has supported Idaho's agricultural and energy industries and opposed new federal and state environmental regulations he views as burdensome. On natural resources, Cornilles has been involved in legislation affecting Idaho's water rights and natural resource management. On firearms, Cornilles has supported firearms preemption legislation.

Political Alignment

Jeff Cornilles is a Mainstream Republican with an agricultural focus. His background in agriculture and committee assignments reflect the agricultural-conservative wing of the Idaho House Republican caucus.

Campaign and Endorsements

Cornilles is unopposed in the Republican primary. He faces Democratic challenger Amanda Easley in the November general election. As of April 2026, no formal endorsements for the 2026 cycle had been publicly reported. Campaign finance records are available through the Idaho Secretary of State's Sunshine database.