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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

Mountain Time Zone

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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