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Idaho County is a county located in the U.S. state of Idahomarker. As of the 2000 Census the county had a population of 15,511 (2007 estimate: 15,345) [14522]. The county seat is Grangevillemarker . Previous county seats were Florence (1864-75) and Mount Idahomarker (1875-1902). At just over 8,500 square miles, Idaho County is the state's largest county by area.

Idaho County was originally founded as a region of Washington Territory in 1861, named for a steamer called Idaho that was launched on the Columbia River in 1860. It was reorganized by the Idaho Territorial Legislature on February 4, 1864. In this context, the name of the county predates both the Idaho Territory and the State of Idahomarker.

Idaho County has two time zones, divided by the Salmon River. Most of the county is in the Pacific Time Zone, but those areas south of the Salmon River, including the city of Rigginsmarker, are in the Mountain Time Zone.


According to the U.S. Census Bureau, the county has a total area of 8,502 square miles (22,021 km²), of which, 8,485 square miles (21,976 km²) of it is land and 18 square miles (46 km²) of it (0.21%) is water. It is part of the Palouse, a wide and rolling prairie-like region of the middle Columbia basin.

Adjacent counties

National protected areas



As of the census of 2000, there were 15,511 people, 6,084 households, and 4,295 families residing in the county. The population density was 2 people per square mile (1/km²). There were 7,537 housing units at an average density of 1 per square mile (0/km²). The racial makeup of the county was 94.12% White, 0.08% Black or African American, 2.89% Native American, 0.26% Asian, 0.02% Pacific Islander, 0.91% from other races, and 1.72% from two or more races. 1.57% of the population were Hispanic or Latino of any race. 29.7% were of German, 12.9% Americanmarker, 11.7% English and 9.0% Irish ancestry according to Census 2000.

There were 6,084 households out of which 29.20% had children under the age of 18 living with them, 60.80% were married couples living together, 6.30% had a female householder with no husband present, and 29.40% were non-families. 25.30% of all households were made up of individuals and 11.70% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 2.95.

In the county the population was spread out with 25.00% under the age of 18, 6.30% from 18 to 24, 23.30% from 25 to 44, 28.40% from 45 to 64, and 17.00% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 103.60 males. For every 100 females age 18 and over, there were 104.90 males.

The median income for a household in the county was $29,515, and the median income for a family was $33,919. Males had a median income of $28,383 versus $18,214 for females. The per capita income for the county was $14,411. About 12.50% of families and 16.30% of the population were below the poverty line, including 21.00% of those under age 18 and 10.00% of those age 65 or over.



Unincorporated communities

  • Burgdorf
  • Clearwater
  • Dixie
  • Elk City
  • Fenn
  • Golden
  • Greencreek
  • Lowell
  • Lucile
  • Mackay Bar
  • Mount Idahomarker
  • Orogrande
  • Pittsburgh Landing
  • Pollock
  • Powell Junction
  • Red River Hot Springs
  • Syringa
  • Warrenmarker
  • Woodland


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