The Southern part of Idaho (except Panhandle and Clearwater Regions) fall in the Mountain Time Zone, which is 7 hours behind Greenwich Mean Time (GMT), while the Northern part of Idaho (Panhandle and Clearwater Regions) fall in the Pacific Time Zone, which is 8 hours behind GMT.
Idaho is divided into political jurisdictions designated as counties.
| IDAHO COUNTIES | ||||
|---|---|---|---|---|
| County name | County seat | Time Zone | Year founded | Population |
| Ada County | Boise | Mountain Time Zone | 1864 | 300,904 |
| Adams County | Council | Mountain Time Zone | 1911 | 3,476 |
| Bannock County | Pocatello | Mountain Time Zone | 1893 | 75,565 |
| Bear Lake County | Paris | Mountain Time Zone | 1893 | 6,411 |
| Benewah County | St. Maries | Pacific Time Zone | 1915 | 9,171 |
| Bingham County | Blackfoot | Mountain Time Zone | 1885 | 41,735 |
| Blaine County | Hailey | 1895 | 18,991 | |
| Boise County | Idaho City | Mountain Time Zone | 1864 | 6,670 |
| Bonner County | Sandpoint | Pacific Time Zone | 1907 | 36,835 |
| Bonneville County | Idaho Falls | Mountain Time Zone | 1911 | 82,522 |
| Boundary County | Bonners Ferry | Pacific Time Zone | 1915 | 9,871 |
| Butte County | Arco | Mountain Time Zone | 1917 | 2,899 |
| Camas County | Fairfield | Mountain Time Zone | 1917 | 991 |
| Canyon County | Caldwell | Mountain Time Zone | 1891 | 131,441 |
| Caribou County | Soda Springs | Mountain Time Zone | 1919 | 7,304 |
| Cassia County | Burley | Mountain Time Zone | 1879 | 21,416 |
| Clark County | Dubois | Mountain Time Zone | 1919 | 1,022 |
| Clearwater County | Orofino | Pacific Time Zone | 1911 | 8,930 |
| Custer County | Challis | Mountain Time Zone | 1881 | 4,342 |
| Elmore County | Mountain Home | Mountain Time Zone | 1889 | 29,130 |
| Franklin County | Preston | Mountain Time Zone | 1913 | 11,329 |
| Fremont County | St. Anthony | Mountain Time Zone | 1893 | 11,819 |
| Gem County | Emmett | Mountain Time Zone | 1915 | 15,181 |
| Gooding County | Gooding | Mountain Time Zone | 1913 | 14,155 |
| Idaho County | Grangeville | Pacific Time Zone | 1861/1864 | 15,511 |
| Jefferson County | Rigby | Mountain Time Zone | 1913 | 19,155 |
| Jerome County | Jerome | Mountain Time Zone | 1919 | 18,342 |
| Kootenai County | Coeur d'Alene | Pacific Time Zone | 1864 | 108,685 |
| Latah County | Moscow | Pacific Time Zone | 1886 | 34,935 |
| Lemhi County | Salmon | Mountain Time Zone | 1869 | 7,806 |
| Lewis County | Nezperce | Pacific Time Zone | 1911 | 3,747 |
| Lincoln County | Shoshone | Mountain Time Zone | 1895 | 4,044 |
| Madison County | Rexburg | Mountain Time Zone | 1914 | 27,467 |
| Minidoka County | Rupert | Mountain Time Zone | 1913 | 20,174 |
| Nez Perce County | Lewiston | Pacific Time Zone | 1861/1864 | 37,410 |
| Oneida County | Malad City | Mountain Time Zone | 1864 | 4,125 |
| Owyhee County | Murphy | Mountain Time Zone | 1863 | 10,644 |
| Payette County | Payette | Mountain Time Zone | 1917 | 20,578 |
| Power County | American Falls | Mountain Time Zone | 1913 | 7,538 |
| Shoshone County | Wallace | Pacific Time Zone | 1864 | 13,771 |
| Teton County | Driggs | Mountain Time Zone | 1915 | 5,999 |
| Twin Falls County | Twin Falls | Mountain Time Zone | 1907 | 64,284 |
| Valley County | Cascade | Mountain Time Zone | 1917 | 7,651 |
| Washington County | Weiser | Mountain Time Zone | 1879 | 9,977 |
Two counties were first designated as such by the Washington Territorial Legislature in 1861; they were subsequently re-designated as Idaho counties in 1864
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