Idaho Counties
Idaho State Time Zones
Counties in Mountain Time and Pacific Time
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.
Counties of Idaho and their Time Zones
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
