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Idaho County is a county located in the state of Idaho. Based on the 2010 census, the
population was 16,267. The county was created
February 4, 1864. The county seat is
Grangeville. Idaho county is named for a steamer called
Idaho that was launched on the Columbia River in 1860.
Idaho County is one of seven counties in the United States that has the same name as the state in which it lies. The other six are Arkansas, Hawaii, Iowa, New York, Oklahoma, and Utah.
Idaho County is named for the steamer Idaho, which was launched on the Columbia River in 1860. Originally a county in Washington Territory, the county's name predates both the State of Idaho and Idaho Territory. Some sources say the name derives from ee-da-how, a word supposedly meaning the sun comes from the mountains in the Shoshone language. However, this explanation is now believed to be a hoax perpetrated by George M. Willing.
County QuickFacts: CensusBureau Quick Facts
Established February 4, 1864 by the First Idaho Territorial Legislature with its county seat at Florence. In 1861 it had been established as the third county of the Washington Territory. Named for the Steamer Idaho that was launched June 9, 1860 on the Columbia River and served miners during the gold rush in north Idaho. In 1875 Mount Idaho was named the county seat, in 1902 the county seat was moved to Grangeville following a 10-year struggle between Grangeville and Mount Idaho. Idaho County was originally founded as a region of Washington Territory in 1861. The county 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 Idaho. Previous county seats of the area were Florence (1864-75) and Mount Idaho (1875-1902).
As reported by the Census Bureau, the county has a total area of 8,503 square miles (22,020 km2), of which 8,477 square miles (21,960 km2) is land and 26 square miles (67 km2) (0.3%) is water.
Idaho county is located in north Idaho. The county is the largest county by area in Idaho.
Bordering counties are as follows: