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History and Facts of Idaho Counties

Idaho Counties – The Idaho Territory was organized on March 3, 1863. The State of Idaho was created as the 43rd state on July 3, 1890. The State of Idaho is bordered by MontanaNevadaOregonUtahWashingtonWyoming and Canada. It has 44 Counties.

List of Idaho Counties

Idaho is divided into 44 counties.

List of Old Former / Extinct Idaho Counties

Idaho has counties that no longer are in existence. A lot of these counties were established and disbanded within the 19th century; county borders have modified very little since 1900 in the vast most of states.

The below Idaho counties no longer exist:

?? County, Idaho

Created ? from ?. It was abolished ? and re-established as ? County on ?.

  • Alturas County(1864-1895) – was a county in Idaho Territory and later the state of Idaho from 1864 to 1895. It covered an area larger than the states of Maryland, New Jersey, and Delaware combined. Most present-day southern Idaho counties were created at least in part from the original Alturas County area. The name Alturas comes from a Spanish word for “mountain summits” or “mountainous heights.” Alturas County was created by the Idaho Territorial Legislature in February 1864. Later that year the mining camp of Rocky Bar was designated the county seat. The county seat was moved to Hailey in 1882. In 1889, the Idaho Territorial Legislature created Elmore County and Logan County from parts of Alturas County. On March 5, 1895, to circumvent a recent state supreme court decision striking down an earlier county reorganization, the Idaho Legislature combined Alturas and Logan Counties into a new county called Blaine. Two weeks later on March 18, the southern portion of the newly-created Blaine County was split off to form Lincoln County with its county seat at Shoshone. Hailey remained the county seat of what was now Blaine County and Alturas County disappeared from the Idaho map.
  • Lah-Toh County (1864-1867) – was a county in Idaho Territory from 1864 to 1867. Lah-Toh County was created by the Idaho Territorial Legislature in 1864 with Coeur d’Alene as its county seat. The name is Nez Perce for “the place of pine trees and sestle”. The county was abolished in 1867, although sources disagree whether the area was absorbed by Nez Perce County or Kootenai County. It is most likely Kootenai since Coeur d’Alene serves as that county’s county seat. The county was re-established in 1888 with different boundaries as Latah County.
  • Logan County (1889-1895) – was a county in Idaho Territory and later the state of Idaho from 1889 to 1895. Logan County was created from parts of Alturas County by the Idaho Territorial Legislature in 1889 with Bellevue as its county seat. Six years later, the Idaho Legislature attempted to return Bellevue to Alturas County, but the plan was struck down by the state supreme court. In response on March 5, 1895, the Idaho Legislature combined Logan and Alturas Counties into a new county called Blaine. Two weeks later on March 18, the southern portion of the newly-created Blaine County was split off to form Lincoln County with its county seat at Shoshone and Logan County ceased to exist. Bellevue became part of Blaine County.

Map of Idaho County Boundary Changes from 1848 to 1965

This Interactive Map of Idaho Counties show the historical boundaries, names, organization, and attachments of every county, extinct county and unsuccessful county proposal from the creation of Idaho in 1848-1965.

Fun Facts about Idaho Counties

County Name Facts

The County names:

  • 0 of them named for Native American words or people,
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Counties by Year

  • ? County was the first county created on ?.
  •  The last county to be formed was ? County on ?.
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Facts for County Size

  • ? County (000 sq mi) is the largest county in Idaho.
  • ? County (000 sq mi) is the smallest county in Idaho.

Facts for County Population (2017 Est.)

  • ? County (000) is the most populated county in Idaho.
  • ? County (000) is the least populated county in Idaho.

Facts for Idaho Counties and Cities

Idaho’s 10 largest cities (2010) are:

  1. Birmingham (000) is in ? County and ? Counties
  2. Boise, Nampa, Meridian, Idaho Falls, Pocatello, Caldwell, Coeur d’Alene, Twin Falls, Lewiston and Post Falls