Idaho Counties
Counties in Idaho State Time Zones
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 | 1864 | 300,904 | |
Adams County | Council | 1911 | 3,476 | |
Bannock County | Pocatello | 1893 | 75,565 | |
Bear Lake County | Paris | 1893 | 6,411 | |
Benewah County | St. Maries | 1915 | 9,171 | |
Bingham County | Blackfoot | 1885 | 41,735 | |
Blaine County | Hailey | 1895 | 18,991 | |
Boise County | Idaho City | 1864 | 6,670 | |
Bonner County | Sandpoint | 1907 | 36,835 | |
Bonneville County | Idaho Falls | 1911 | 82,522 | |
Boundary County | Bonners Ferry | 1915 | 9,871 | |
Butte County | Arco | 1917 | 2,899 | |
Camas County | Fairfield | 1917 | 991 | |
Canyon County | Caldwell | 1891 | 131,441 | |
Caribou County | Soda Springs | 1919 | 7,304 | |
Cassia County | Burley | 1879 | 21,416 | |
Clark County | Dubois | 1919 | 1,022 | |
Clearwater County | Orofino | 1911 | 8,930 | |
Custer County | Challis | 1881 | 4,342 | |
Elmore County | Mountain Home | 1889 | 29,130 | |
Franklin County | Preston | 1913 | 11,329 | |
Fremont County | St. Anthony | 1893 | 11,819 | |
Gem County | Emmett | 1915 | 15,181 | |
Gooding County | Gooding | 1913 | 14,155 | |
Idaho County | Grangeville | 1861/1864 | 15,511 | |
Jefferson County | Rigby | 1913 | 19,155 | |
Jerome County | Jerome | 1919 | 18,342 | |
Kootenai County | Coeur d'Alene | 1864 | 108,685 | |
Latah County | Moscow | 1886 | 34,935 | |
Lemhi County | Salmon | 1869 | 7,806 | |
Lewis County | Nezperce | 1911 | 3,747 | |
Lincoln County | Shoshone | 1895 | 4,044 | |
Madison County | Rexburg | 1914 | 27,467 | |
Minidoka County | Rupert | 1913 | 20,174 | |
Nez Perce County | Lewiston | 1861/1864 | 37,410 | |
Oneida County | Malad City | 1864 | 4,125 | |
Owyhee County | Murphy | 1863 | 10,644 | |
Payette County | Payette | 1917 | 20,578 | |
Power County | American Falls | 1913 | 7,538 | |
Shoshone County | Wallace | 1864 | 13,771 | |
Teton County | Driggs | 1915 | 5,999 | |
Twin Falls County | Twin Falls | 1907 | 64,284 | |
Valley County | Cascade | 1917 | 7,651 | |
Washington County | Weiser | 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
