As of the 2000 Census, the population of Cassia County Idaho is, 21,416.
The total area of Cassia County Idaho is, 2,567 sq mi, (6,648 km sq).
Benewah County Idaho was established in 1915.
Idaho County Idaho was established in 1864.
The web address of the Cassia County Historical Society Inc is: http://cassiacounty.org
Adams County Idaho was Established in 1911.
Blaine County Idaho was established in 1895.
Bonneville County Idaho was established in 1911.
Butte County Idaho was established in 1917.
Boundary County Idaho was established in 1915.
Canyon County Idaho was established in 1892.
Caribou County Idaho was established in 1919.