Elmore County is a

county A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) '' Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denoti ...

in the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...

Idaho Idaho ( ) is a landlocked U.S. state, state in the Pacific Northwest and Mountain states, Mountain West subregions of the Western United States. It borders Montana and Wyoming to the east, Nevada and Utah to the south, and Washington (state), ...

. As of the 2020 census, the population was 28,666. The largest city and

county seat A county seat is an administrative center, seat of government, or capital city of a county or parish (administrative division), civil parish. The term is in use in five countries: Canada, China, Hungary, Romania, and the United States. An equiva ...

is Mountain Home. Elmore County comprises the Mountain Home, ID Micropolitan Statistical Area, which is also included in the

Boise Boise ( ) is the capital and most populous city of the U.S. state of Idaho. As of the 2020 census, there were 235,685 people residing in the city. Located on the Boise River in southwestern Idaho, it is east of the Oregon border and nor ...

-Mountain Home-

Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...

, ID- OR Combined Statistical Area.

History

Elmore County was established February 7, 1889, with its county seat at Rocky Bar. It is named after the Ida Elmore mines, the area's greatest

silver Silver is a chemical element; it has Symbol (chemistry), symbol Ag () and atomic number 47. A soft, whitish-gray, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. ...

and

gold Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a brightness, bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal ...

producer of the 1860s, located near Silver City in

Owyhee County Owyhee County ( ) is a county in the southwestern corner of the U.S. state of Idaho. As of the 2020 census, the population was 11,913. The county seat is Murphy, and its largest city is Homedale. In area it is the second-largest county in I ...

. While the

Oregon Trail The Oregon Trail was a east–west, large-wheeled wagon route and Westward Expansion Trails, emigrant trail in North America that connected the Missouri River to valleys in Oregon Territory. The eastern part of the Oregon Trail crossed what ...

crossed the

Snake River The Snake River is a major river in the interior Pacific Northwest region of the United States. About long, it is the largest tributary of the Columbia River, which is the largest North American river that empties into the Pacific Ocean. Begin ...

in Elmore County, at Three Island Crossing near Glenns Ferry, the significant early settlements of Elmore County were mining settlements located primarily in northern Elmore County surrounding the ghost town of Rocky Bar. Settlement at Rocky Bar commenced in 1863 with the settlement having 560 residents at the Territorial Census of that year. Nearby, Atlanta was settled in 1864. Elmore County north of the Snake River was originally part of Alturas County when it was created in 1864 and Rocky Bar became its county seat. The portion of Elmore County south of the Snake River was within Owyhee County until 1930. A small portion of Ada County was also annexed in 1948, bringing Elmore to its present boundary. The settlement at Rocky Bar was impacted by poor management by mining companies, mining lawsuits, and its geographic remoteness between 1869 and 1880. The Wood River experienced a surge in settlement at Hailey starting in 1880 that led to Rocky Bar's loss of the county seat to Hailey in 1882. Rocky Bar would briefly become a county seat upon the creation of Elmore County in 1889. A station on the overland stage route, originally named Rattlesnake, was moved west to the railroad line and became Mountain Home. On February 4, 1891, the county seat was moved to Mountain Home. Construction of Mountain Home Air Force Base began in October 1942, southwest of Mountain Home. The base officially opened in August 1943 as a training base for

bomber A bomber is a military combat aircraft that utilizes air-to-ground weaponry to drop bombs, launch aerial torpedo, torpedoes, or deploy air-launched cruise missiles. There are two major classifications of bomber: strategic and tactical. Strateg ...

s, and was an operational base under the

Strategic Air Command Strategic Air Command (SAC) was a United States Department of Defense Specified Command and a United States Air Force (USAF) Major Command responsible for command and control of the strategic bomber and intercontinental ballistic missile compon ...

(SAC) through 1965. It became a fighter base in 1966 under

Tactical Air Command Tactical Air Command (TAC) is an inactive United States Air Force organization. It was a List of Major Commands of the United States Air Force, Major Command of the United States Air Force, established on 21 March 1946 and headquartered at Lang ...

(TAC), which became Air Combat Command (ACC) in 1992. Anderson Ranch Dam is east of Mountain Home on the South Fork of the

Boise River The Boise River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. , accessed May 3, 2011 tributary of the Snake River in the Northwestern United States. It drains a rugged portion of the Sawtooth Range in so ...

. At the time of its completion in 1950, it was the world's highest earthfill dam.

Geography

According to the

U.S. Census Bureau The United States Census Bureau, officially the Bureau of the Census, is a principal agency of the U.S. federal statistical system, responsible for producing data about the American people and economy. The U.S. Census Bureau is part of the U ...

, the county has a total area of , of which is land and (0.8%) is water. Elmore County's highest point is Snowyside Peak at

above sea level Height above mean sea level is a measure of a location's vertical distance (height, elevation or altitude) in reference to a vertical datum based on a historic mean sea level. In geodesy, it is formalized as orthometric height. The zero level ...

, located in the northeast corner of the county in the Sawtooth Wilderness. The lowest

elevation The elevation of a geographic location (geography), ''location'' is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational equipotenti ...

in the county is the

in the southwest corner, at less than .

Adjacent counties

Boise County Boise County is a rural mountain county in the U.S. state of Idaho. As of the 2020 United States census, the population was 7,610. The county seat is historic Idaho City, which is connected through a series of paved and unpaved roads to Lowm ...

- north * Ada County - west *

- south * Twin Falls County - southeast * Gooding County - east * Camas County - east * Blaine County - northeast * Custer County - northeast

Major highways

* * * * * * * * *

National protected areas

Boise National Forest Boise National Forest is a United States National Forest, National Forest covering of the U.S. state of Idaho. Created on July 1, 1908, from part of Sawtooth National Forest, it is managed by the United States Forest Service, U.S. Forest Se ...

(part) *

Sawtooth National Forest Sawtooth National Forest is a United States National Forest, National Forest that covers 2,110,408 acres (854,052 ha) in the U.S. states of Idaho (~96 percent) and Utah (~4 percent). Managed by the U.S. Forest Service in the United States Depart ...

(part) *

Sawtooth National Recreation Area The Sawtooth National Recreation Area (SNRA) is a national recreation area in central Idaho, United States that is managed as part of Sawtooth National Forest. The recreation area, established on August 22, 1972, is managed by the U.S. Forest S ...

(part) ** Sawtooth Wilderness (part) * Snake River Birds of Prey National Conservation Area (part)

Demographics

2000 census

As of the

census A census (from Latin ''censere'', 'to assess') is the procedure of systematically acquiring, recording, and calculating population information about the members of a given Statistical population, population, usually displayed in the form of stati ...

of 2000, there were 29,130 people, 9,092 households, and 6,846 families living in the county. The

population density Population density (in agriculture: Standing stock (disambiguation), standing stock or plant density) is a measurement of population per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key geog ...

was . There were 10,527 housing units at an average density of . The racial makeup of the county was 85.37%

White White is the lightest color and is achromatic (having no chroma). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully (or almost fully) reflect and scatter all the visible wa ...

, 3.25%

Black Black is a color that results from the absence or complete absorption of visible light. It is an achromatic color, without chroma, like white and grey. It is often used symbolically or figuratively to represent darkness.Eva Heller, ''P ...

African American African Americans, also known as Black Americans and formerly also called Afro-Americans, are an Race and ethnicity in the United States, American racial and ethnic group that consists of Americans who have total or partial ancestry from an ...

, 0.89% Native American, 1.66% Asian, 0.19%

Pacific Islander Pacific Islanders, Pasifika, Pasefika, Pacificans, or rarely Pacificers are the peoples of the list of islands in the Pacific Ocean, Pacific Islands. As an ethnic group, ethnic/race (human categorization), racial term, it is used to describe th ...

, 5.39% from other races, and 3.25% from two or more races. 11.99% of the population were

Hispanic The term Hispanic () are people, Spanish culture, cultures, or countries related to Spain, the Spanish language, or broadly. In some contexts, Hispanic and Latino Americans, especially within the United States, "Hispanic" is used as an Ethnici ...

or Latino of any race. 16.8% were of

German German(s) may refer to: * Germany, the country of the Germans and German things **Germania (Roman era) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizenship in Germany, see also Ge ...

, 12.0% English, 9.2% American and 8.3% Irish ancestry. There were 9,092 households, out of which 43.00% had children under the age of 18 living with them, 64.10% were

married couples Marriage, also called matrimony or wedlock, is a culturally and often legally recognised union between people called spouses. It establishes rights and obligations between them, as well as between them and their children (if any), and b ...

living together, 7.50% had a female householder with no husband present, and 24.70% were non-families. 20.70% of all households were made up of individuals, and 6.40% had someone living alone who was 65 years of age or older. The average household size was 2.76 and the average family size was 3.21. In the county, the population was spread out, with 28.00% under the age of 18, 13.90% from 18 to 24, 36.00% from 25 to 44, 15.00% from 45 to 64, and 7.10% who were 65 years of age or older. The median age was 29 years. For every 100 females there were 123.20 males. For every 100 females age 18 and over, there were 130.60 males. The median income for a household in the county was $35,256, and the median income for a family was $37,823. Males had a median income of $26,248 versus $21,309 for females. The

per capita income Per capita income (PCI) or average income measures the average income earned per person in a given area (city, region, country, etc.) in a specified year. In many countries, per capita income is determined using regular population surveys, such ...

for the county was $16,773. About 8.80% of families and 11.20% of the population were below the

poverty line The poverty threshold, poverty limit, poverty line, or breadline is the minimum level of income deemed adequate in a particular country. The poverty line is usually calculated by estimating the total cost of one year's worth of necessities for ...

, including 15.00% of those under age 18 and 10.80% of those age 65 or over.

2010 census

As of the 2010 United States census, there were 27,038 people, 10,140 households, and 7,135 families living in the county. The population density was . There were 12,162 housing units at an average density of . The racial makeup of the county was 82.2% white, 2.8% Asian, 2.7% black or African American, 1.0% American Indian, 0.4% Pacific islander, 6.8% from other races, and 4.1% from two or more races. Those of Hispanic or Latino origin made up 15.2% of the population. In terms of ancestry, 20.4% were

, 13.5% were English, 12.4% were Irish, and 9.0% were American. Of the 10,140 households, 38.6% had children under the age of 18 living with them, 56.6% were married couples living together, 9.4% had a female householder with no husband present, 29.6% were non-families, and 23.8% of all households were made up of individuals. The average household size was 2.60 and the average family size was 3.11. The median age was 30.0 years. The median income for a household in the county was $43,089 and the median income for a family was $50,840. Males had a median income of $34,126 versus $25,999 for females. The per capita income for the county was $20,388. About 9.2% of families and 12.0% of the population were below the

, including 19.3% of those under age 18 and 7.8% of those age 65 or over.

Communities

Cities

* Glenns Ferry * Mountain Home

Census-designated place

* Hammett * Mountain Home Air Force Base

Unincorporated communities

Atlanta Atlanta ( ) is the List of capitals in the United States, capital and List of municipalities in Georgia (U.S. state), most populous city in the U.S. state of Georgia (U.S. state), Georgia. It is the county seat, seat of Fulton County, Georg ...

Dixie Dixie, also known as Dixieland or Dixie's Land, is a nickname for all or part of the Southern United States. While there is no official definition of this region (and the included areas have shifted over the years), or the extent of the area i ...

*Featherville * King Hill *Pine *Tipanuk

Ghost town

* Rocky Bar

Politics

Education

School districts include: * Bliss Joint School District 234 * Bruneau-Grand View Joint School District 365 * Glenns Ferry Joint School District 192 * Mountain Home School District 193 * Prairie Elementary School District 191 Residents in a portion of the county are in the area (but not the taxation zone) for

College of Western Idaho College of Western Idaho (CWI) is a public community college in Southwest Idaho with its primary campus locations in Boise and Nampa. CWI also offers classes at several community locations throughout the Treasure Valley. It is one of four c ...

. In the remainder, it is in the area (but not the taxation zone) for

College of Southern Idaho College of Southern Idaho (CSI) is a public community college in Twin Falls, Idaho. It also has off-campus programs in Jerome, Hailey, Burley and Gooding. Together with the College of Eastern Idaho, College of Western Idaho and North Ida ...

. - For details on the portions of Elmore and Owyhee counties, see area 4 in:

References

External links

County website

{{coord, 43.34, -115.47, display=title, type:adm2nd_region:US-ID_source:UScensus1990 Idaho counties 1889 establishments in Idaho Territory Populated places established in 1889