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.
Bonneville County Idaho was established in 1911.
Butte County Idaho was established in 1917.
Canyon County Idaho was established in 1892.
Caribou County Idaho was established in 1919.
Clark County Idaho was established in 1919.
Clearwater County Idaho was established in 1911.
Custer County Idaho was established in 1881.
Elmore County Idaho was established in 1889.