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Idaho Counties

There are44 Counties in Idaho.
Counties are the largest political divisions within the state.

When Idaho became a territory in March, 1863, there were four Counties in existence: Boise, Idaho, Nez Perce and Shoshone. By the time Idaho became a state 27 years later, there were 15 counties. The rest of the 44 Counties came into existence during the 30 years after Idaho became a state. Two of the former Counties disappeared during this time. Alturas, which was created in 1864, was later divided into the many Counties now found in central Idaho. Logan County was only in existence for six years, from 1889 to 1895. It was combined with Alturas to form Blaine County and Lincoln County, which was formed just two weeks after Logan lost its identity.

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Ada County, Idaho

Ada County History, Geography, and Demographics

County Seat: Boise
Year Organized: 1864
Square Miles: 1,055
Court House:

200 West Front Street
County Courthouse
Boise, ID 83702-7300

Etymology - Origin of County Name

Ada County is named for Ada Riggs, the first pioneer child born in the area and the daughter of H. C. Riggs, a cofounder of Boise.

Demographics:

County QuickFacts: Census Bureau Quick Facts

County History

Established December 22, 1864 with its county seat at Boise. Named for Ada Riggs, the first white child born in the area and the daughter of H.C. Riggs, one of the founders of Boise and a member of the Idaho Territorial Legislature. Boise became the capital of Idaho in 1865

Neighboring Counties:

  • North: Gem County
  • Northeast: Boise County
  • East: Elmore County
  • South: Owyhee County
  • Northwest: Canyon County
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