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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.

Idaho map

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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