Butte County

Butte County is a county in southeastern Idaho with mountains, valleys, and river systems running through it. The terrain varies from grasslands to forested areas that cover the landscape across its extent.

The county was established in 1917, with Arco designated as its administrative center. The region became significant during the 20th century as a testing ground for nuclear power development.

Ranching and farming families have shaped the way people live here for generations, with livestock and crops defining both the landscape and daily rhythms. The open spaces reflect how deeply agriculture is woven into the local identity.

Administrative services and official business are handled in Arco, the main town. This is a rural area spread out across open land, so visitors should plan for distances between points of interest.

An experimental nuclear reactor in this area was the first place anywhere in the world to produce electricity from nuclear power. This achievement made the region a landmark in energy history and innovation.

Location: Idaho

Inception: February 6, 1917

Capital city: Arco

Shares border with: Custer County, Lemhi County, Clark County, Jefferson County, Bingham County, Blaine County

GPS coordinates: 43.72000,-113.17000

Latest update: December 14, 2025 20:26