As used in sections 67-4710 through 67-4719, Idaho Code, unless the context requires otherwise:
No. 1. The counties of Benewah, Bonner, Boundary, Kootenai and Shoshone.
No. 2. The counties of Clearwater, Idaho, Latah, Lewis and Nez Perce.
No. 3. The counties of Adams, Canyon, Gem, Payette, Washington, Ada, Owyhee, Elmore, Boise and Valley.
No. 4. The counties of Camas, Cassia, Gooding, Jerome, Lincoln, Minidoka and Twin Falls.
No. 5. The counties of Bannock, Caribou, Bear Lake, Franklin, Oneida, Power and Bingham.
No. 6. The counties of Clark, Jefferson, Fremont, Madison, Teton and Bonneville.
No. 7. The counties of Blaine, Lemhi, Custer and Butte.
Idaho Code § 67-4711