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Elmore County IDGenWeb is a free genealogical site about the history of the Idaho county. It is a member of IDGenWeb, which is a member of USGenWeb®. We hope you find helpful clues for your research of Elmore County ancestors.

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Temporary County Coordinator: Norma Hass normahass01@gmail.com

State Coordinator: Kerry Hairston kerry.hairston@gmail.com

COUNTY FORMATION

Elmore County was formed from now-defunct Alturas County, established February 7, 1889. The county was named for the Ida Elmore mines, the area's greatest silver and gold producer of the 1860's. Elmore County gained a bit of territory south of the Snake River from Owyhee County in 1930. Another small portion was annexed to Elmore County in 1948, from Ada County.

The county seat was moved from Rocky Bar to Mountain Home February 4, 1891.

Elmore county is home to three of Idaho's major reservoirs; Lucky Peak, Anderson Ranch, and Arrowrock and is also home to Idaho's only major military installation, Mountain Home Air Force Base.