Benewah County Idaho was established in 1915.
Idaho County Idaho was established in 1864.
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.
Cassia County Idaho was established in 1879.
Clark County Idaho was established in 1919.
Clearwater County Idaho was established in 1911.