Idaho Code § 25-3104: Representative districts.

Three (3) elected commission members shall represent one (1) of the following districts:

(1) District I, which shall include the counties of Ada, Adams, Benewah, Boise, Bonner, Boundary, Canyon, Clearwater, Elmore, Gem, Idaho, Kootenai, Latah, Lewis, Nez Perce, Owyhee, Payette, Shoshone, Valley and Washington;

(2) District II, which shall include the counties of Blaine, Camas, Gooding, Jerome, Lincoln, Cassia, Minidoka and Twin Falls;

(3) District III, which shall include the counties of Bannock, Bear Lake, Bingham, Bonneville, Butte, Caribou, Clark, Custer, Franklin, Fremont, Jefferson, Lemhi, Madison, Oneida, Power and Teton.