Counties and equivalents in Mountain Time (America/Boise)
36 counties and equivalents overlap the America/Boise time zone (Mountain Time). They are listed by population, largest first, starting with Ada County, Idaho, Canyon County, Idaho, and Bonneville County, Idaho. An overlap does not mean that every address belongs to both.
- Ada County, Idaho
- Canyon County, Idaho
- Bonneville County, Idaho
- Twin Falls County, Idaho
- Bannock County, Idaho
- Madison County, Idaho
- Bingham County, Idaho
- Jefferson County, Idaho
- Malheur County, Oregon
- Elmore County, Idaho
- Payette County, Idaho
- Cassia County, Idaho
- Jerome County, Idaho
- Blaine County, Idaho
- Minidoka County, Idaho
- Gem County, Idaho
- Idaho County, Idaho
- Gooding County, Idaho
- Franklin County, Idaho
- Fremont County, Idaho
- Teton County, Idaho
- Valley County, Idaho
- Owyhee County, Idaho
- Washington County, Idaho
- Boise County, Idaho
- Lemhi County, Idaho
- Power County, Idaho
- Caribou County, Idaho
- Bear Lake County, Idaho
- Lincoln County, Idaho
- Oneida County, Idaho
- Adams County, Idaho
- Custer County, Idaho
- Butte County, Idaho
- Camas County, Idaho
- Clark County, Idaho