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Idaho County, Idaho

US county information
NameIdaho County
Largest cityGrangeville
US Area
Total Area8502.48 sq mi (22021.4 km2)
Land Area8484.88 sq mi (21975.8 km2)
Water Area17.59 sq mi (45.6 km2)
Population15511 (2000)
Density0.7/km2 (1.8/sq mi)
Named forA steamer called Idaho that was launched on the Columbia River in 1860.
Time zonePacific
Time zonePacific: UTC-8/-7: -8/-7

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Idaho County is a county located in the U.S. state of Idaho. As of the 2000 Census the county had a population of 15,511 (2007 estimate: 15,345). The county seat is Grangeville . Previous county seats were Florence (1864-75) and Mount Idaho (1875-1902). At just over 8500 sqmi (22014.9 km2), Idaho County is the state's largest county by area and is roughly the same size as New Jersey.

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 Idaho.

Idaho County is one of the few counties in the United States with two time zones: Pacific and Mountain; they are 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 Riggins, are in the Mountain Time Zone.

Idaho County is one of seven US counties to share its name with its state (the others are Arkansas County, Hawaii County, Iowa County, New York County, Oklahoma County, and Utah County).

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