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Elmore County, Idaho

Elmore County, Idaho
Elmore County Courthouse
Seal of Elmore County, Idaho
Map of Idaho highlighting Elmore County
Location in the state of Idaho
Map of the United States highlighting Idaho
Idaho's location in the U.S.
Founded February 7, 1889
Named for The Ida Elmore mines, producer of silver and gold in the 1860s
Seat Mountain Home
Largest city Mountain Home
 • Total 3,101 sq mi (8,032 km2)
 • Land 3,075 sq mi (7,964 km2)
 • Water 26 sq mi (67 km2), 0.8%
 • (2010) 27,038
 • Density 8.8/sq mi (3/km²)
Congressional district 2nd
Time zone Mountain: UTC-7/-6
Website .orgelmorecounty

Elmore County is a county located in the U.S. state of Idaho. As of the 2010 census, the population was 29,130.[1] The largest city and county seat is Mountain Home.[2]

Elmore County comprises the Mountain Home, ID Micropolitan Statistical Area, which is also included in the Boise-Mountain Home-Ontario, ID-OR Combined Statistical Area.


  • History 1
  • Geography 2
    • Adjacent counties 2.1
    • Major highways 2.2
    • National protected areas 2.3
  • Demographics 3
  • Communities 4
    • Cities 4.1
    • Census-designated place 4.2
    • Unincorporated communities 4.3
    • Ghost town 4.4
  • See also 5
  • References 6
  • External links 7


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 and gold producer of the 1860s, located near Silver City in Owyhee County.[3][4]

The Oregon Trail crossed the Snake River in Elmore County, at Three Island Crossing near Glenns Ferry. 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.[5]

Construction of what would become Mountain Home Air Force Base was begun in October 1942, 12 miles (19 km) southwest of Mountain Home. The base officially opened in August 1943 as a training base for bombers, and was an operational base under SAC through 1965. It became a fighter base in 1966 under TAC, now the Air Combat Command.

Anderson Ranch Dam is east of Mountain Home on the South Fork of the Boise River. At the time of its completion in 1950, it was the world's highest earthfill dam.[6]


According to the U.S. Census Bureau, the county has a total area of 3,101 square miles (8,030 km2), of which 3,075 square miles (7,960 km2) is land and 26 square miles (67 km2) (0.8%) is water.[7] Elmore County's highest point is Snowyside Peak at 10,651 feet (3,246 m) above sea level, located in the northeast corner of the county in the Sawtooth Wilderness. The lowest elevation in the county is the Snake River in the southwest corner, at less than 2,500 feet (760 m).

Adjacent counties

Major highways

National protected areas


As of the census[13] of 2000, there were 29,130 people, 9,092 households, and 6,846 families residing in the county. The population density was 10 people per square mile (4/km²). There were 10,527 housing units at an average density of 3 per square mile (1/km²). The racial makeup of the county was 85.37% White, 3.25% Black or African American, 0.89% Native American, 1.66% Asian, 0.19% Pacific Islander, 5.39% from other races, and 3.25% from two or more races. 11.99% of the population were Hispanic or Latino of any race. 16.8% were of German, 12.0% English, 9.2% American and 8.3% Irish ancestry according to Census 2000.

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 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 for the county was $16,773. About 8.80% of families and 11.20% of the population were below the poverty line, including 15.00% of those under age 18 and 10.80% of those age 65 or over.



Census-designated place

Unincorporated communities

Ghost town

See also


  1. ^ a b "State & County QuickFacts". United States Census Bureau. Retrieved June 30, 2014. 
  2. ^ "Find a County". National Association of Counties. Retrieved 2011-06-07. 
  3. ^ Idaho State Historical Society - J. Marion More - accessed 2009-06-15.
  4. ^ "Idaho for the Curious", by Cort Conley, ©1982, ISBN 0-9603566-3-0, p.374-379
  5. ^ - about Elmore County - accessed 2009-05-15
  6. ^ - Anderson Ranch Dam - accessed 2011-09-27
  7. ^ "US Gazetteer files: 2010, 2000, and 1990".  
  8. ^ "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2014". Retrieved June 4, 2015. 
  9. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved June 30, 2014. 
  10. ^ "Historical Census Browser". University of Virginia Library. Retrieved June 30, 2014. 
  11. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved June 30, 2014. 
  12. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved June 30, 2014. 
  13. ^ "American FactFinder".  

External links

  • County website
  • - Elmore County profile

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