Cassia County, Idaho

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Cassia County is a county located in the U.S. state of Idaho. As of the 2000 Census the county had a population of 21,416 (2008 estimate: 21,348).[1] The county seat and largest city is Burley.[2]

Cassia County was created by the Idaho Territorial Legislature on February 20, 1879, by a partition of Owyhee County, with the county seat at Albion.[3] A western portion became Twin Falls County in 1907. The county assumed its present boundaries when an eastern portion became Power County on January 30, 1913. The county seat was moved to Burley in 1918. The county was named for Cassia Creek, which in turn was named either for John Cazier, a member of the Mormon Battalion and an emigrant train captain, or for a plant found in the area.

Cassia County is part of the Burley, ID Micropolitan Statistical Area.



According to the United States Census Bureau, the county has a total area of 2,580 square miles (6,682.2 km2), of which 2,566 square miles (6,645.9 km2) is land and 14 square miles (36.3 km2) (0.54%) is water. The county's highest point is Cache Peak at an elevation of 10,339 feet (3,151 m) above sea level, and the lowest is Milner Lake, a reservoir on the Snake River, at 4,134 feet (1,260 m).

The northern half of the county is part of the Magic Valley region of the Snake River Plain, and numerous mountain ranges extend north from the southern boundary and diminish as they approach the river, which flows from east to west.

The Silent City of Rocks National Reserve, containing exposed granitic batholith as old as 2.5 billion years, is located in the southern part of the county.

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