ISTA Regions

Boundary, Bonner, Benewah, Kootenai, and Shoshone Counties

Latah, Clearwater, Idaho, Nez Perce, and Lewis Counties

Adams, Washington, Payette, Gem, Canyon, and Owyhee
Counties

Blain, Camas, Gooding, Lincoln, Cassia, Minidoka, Twin Falls,
And Jerome Counties

Bear Lake, Franklin, Oneida, Power, Bannock, Caribou, and part
of Bingham Counties

Clark, Fremont, Lemhi, Custer, Butte, Teton, Madison, Jefferson,
Bonneville, and the balance of Bingham Counties

Valley, Boise, Ada, and Elmore Counties