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Cassia County is a county located in the U.S. state of Idaho . As of the 2010 Census the county had a population of 22,952. The county seat and largest city is Burley .
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 . 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.