Alphabetical List
| County |
FIPS code |
County seat |
Established |
Origin |
Etymology |
Population |
Area |
Map |
|---|---|---|---|---|---|---|---|---|
| Ada County | 001 | Boise | 1864 | Boise County | Ada Riggs, daughter of H. C. Riggs, a member of the Idaho Territorial Legislature. | 7005392365000000000392,365 | 70031055000000000001,055 sq mi (70032732000000000002,732 km2) |
|
| Adams County | 003 | Council | 1911 | Washington County | John Adams, second President of the United States . | 70033976000000000003,976 | 70031365000000000001,365 sq mi (70033535000000000003,535 km2) |
|
| Bannock County | 005 | Pocatello | 1893 | Bingham County | Bannock Native American tribe. | 700482839000000000082,839 | 70031113000000000001,113 sq mi (70032883000000000002,883 km2) |
|
| Bear Lake County | 007 | Paris | 1893 | Oneida County | Bear Lake on the Utah/Idaho border. | 70035986000000000005,986 | 7002971000000000000971 sq mi (70032515000000000002,515 km2) |
|
| Benewah County | 009 | St. Maries | 1915 | Kootenai County | Benewah, chief of the Coeur d'Alene Tribe | 70039285000000000009,285 | 7002776000000000000776 sq mi (70032010000000000002,010 km2) |
|
| Bingham County | 011 | Blackfoot | 1885 | Oneida County | Henry H. Bingham, a general in the American Civil War and a U.S. Congressman from Pennsylvania. | 700445607000000000045,607 | 70032095000000000002,095 sq mi (70035426000000000005,426 km2) |
|
| Blaine County | 013 | Hailey | 1895 | Alturas County | James G. Blaine, United States Secretary of State . | 700421376000000000021,376 | 70032645000000000002,645 sq mi (70036851000000000006,851 km2) |
|
| Boise County | 015 | Idaho City | 1864 | Original county | Boise River | 70037028000000000007,028 | 70031902000000000001,902 sq mi (70034926000000000004,926 km2) |
|
| Bonner County | 017 | Sandpoint | 1907 | Kootenai County | Edwin L. Bonner, originator of a 1864 ferry service on the Kootenai River. | 700440877000000000040,877 | 70031738000000000001,738 sq mi (70034501000000000004,501 km2) |
|
| Bonneville County | 019 | Idaho Falls | 1911 | Bingham County | Benjamin Bonneville, a French-born explorer of the West. | 7005104234000000000104,234 | 70031869000000000001,869 sq mi (70034841000000000004,841 km2) |
|
| Boundary County | 021 | Bonners Ferry | 1915 | Bonner | Borders Canada on the north. | 700410972000000000010,972 | 70031269000000000001,269 sq mi (70033287000000000003,287 km2) |
|
| Butte County | 023 | Arco | 1917 | Bingham, Blaine, and Jefferson counties | Buttes rising from the Snake River Plain. | 70032891000000000002,891 | 70032233000000000002,233 sq mi (70035783000000000005,783 km2) |
|
| Camas County | 025 | Fairfield | 1917 | Blaine County | Camassia, a plant species important as a food source among Native Americans and early settlers. | 70031117000000000001,117 | 70031075000000000001,075 sq mi (70032784000000000002,784 km2) |
|
| Canyon County | 027 | Caldwell | 1892 | Ada County | Disputed, either a canyon of the Boise River near Caldwell or a canyon of the Snake River which forms part of the county's boundary. | 7005188923000000000188,923 | 7002590000000000000590 sq mi (70031528000000000001,528 km2) |
|
| Caribou County | 029 | Soda Springs | 1919 | Bannock County | Caribou Mountains | 70036963000000000006,963 | 70031766000000000001,766 sq mi (70034574000000000004,574 km2) |
|
| Cassia County | 031 | Burley | 1879 | Owyhee County | Disputed, either Cassia Creek or a member of the Mormon Battalion, James John Cazier. | 700422952000000000022,952 | 70032567000000000002,567 sq mi (70036648000000000006,648 km2) |
|
| Clark County | 033 | Dubois | 1919 | Fremont County | Sam K. Clark, early settler and a member of the Idaho Senate. | 7002982000000000000982 | 70031765000000000001,765 sq mi (70034571000000000004,571 km2) |
|
| Clearwater County | 035 | Orofino | 1911 | Nez Perce County | Clearwater River | 70038761000000000008,761 | 70032462000000000002,462 sq mi (70036377000000000006,377 km2) |
|
| Custer County | 037 | Challis | 1881 | Alturas and Lemhi counties | General Custer mine, named after George Armstrong Custer, United States Army general. | 70034368000000000004,368 | 70034926000000000004,926 sq mi (700412758000000000012,758 km2) |
|
| Elmore County | 039 | Mountain Home | 1889 | Alturas County | Ida Elmore mines, locally noted for gold and silver production in the 1860s. | 700427038000000000027,038 | 70033078000000000003,078 sq mi (70037972000000000007,972 km2) |
|
| Franklin County | 041 | Preston | 1913 | Oneida County | Franklin D. Richards, early LDS Church apostle. | 700412786000000000012,786 | 7002666000000000000666 sq mi (70031725000000000001,725 km2) |
|
| Fremont County | 043 | Saint Anthony | 1893 | Bingham County | John C. Frémont, an explorer of the West. | 700413242000000000013,242 | 70031867000000000001,867 sq mi (70034836000000000004,836 km2) |
|
| Gem County | 045 | Emmett | 1915 | Boise and Canyon counties | State nickname of "Gem State." | 700416719000000000016,719 | 7002563000000000000563 sq mi (70031458000000000001,458 km2) |
|
| Gooding County | 047 | Gooding | 1913 | Lincoln County | Frank R. Gooding, seventh Governor of Idaho, U.S. Senator . | 700415464000000000015,464 | 7002731000000000000731 sq mi (70031893000000000001,893 km2) |
|
| Idaho County | 049 | Grangeville | 1864 | Original county | Columbia River steamship Idaho launched in 1860. Name predates both Idaho Territory and the State of Idaho. | 700416267000000000016,267 | 70038485000000000008,485 sq mi (700421976000000000021,976 km2) |
|
| Jefferson County | 051 | Rigby | 1913 | Fremont County | Thomas Jefferson, third President of the United States . | 700426140000000000026,140 | 70031095000000000001,095 sq mi (70032836000000000002,836 km2) |
|
| Jerome County | 053 | Jerome | 1919 | Gooding and Lincoln counties | Disputed, either North Side Irrigation Project developer Jerome Hill, his son-in-law Jerome Kuhn, or his grandson Jerome Kuhn, Jr. | 700422374000000000022,374 | 7002600000000000000600 sq mi (70031554000000000001,554 km2) |
|
| Kootenai County | 055 | Coeur d'Alene | 1864 | Nez Perce County | Kootenai Native American tribe. | 7005138494000000000138,494 | 70031245000000000001,245 sq mi (70033225000000000003,225 km2) |
|
| Latah County | 057 | Moscow | 1888 | Nez Perce County | Latah Creek, Nez Perce for "the place of pine trees and sestle." | 700437244000000000037,244 | 70031077000000000001,077 sq mi (70032789000000000002,789 km2) |
|
| Lemhi County | 059 | Salmon | 1869 | Idaho County | Limhi, king of the Nephites according to the Book of Mormon. | 70037936000000000007,936 | 70034564000000000004,564 sq mi (700411821000000000011,821 km2) |
|
| Lewis County | 061 | Nezperce | 1911 | Nez Perce County | Meriwether Lewis, a leader of the Lewis and Clark Expedition. | 70033821000000000003,821 | 7002479000000000000479 sq mi (70031241000000000001,241 km2) |
|
| Lincoln County | 063 | Shoshone | 1895 | Logan County | Abraham Lincoln, sixteenth President of the United States . Idaho Territory was founded under Lincoln's administration. | 70035208000000000005,208 | 70031206000000000001,206 sq mi (70033124000000000003,124 km2) |
|
| Madison County | 065 | Rexburg | 1913 | Fremont County | James Madison, fourth President of the United States . | 700437536000000000037,536 | 7002472000000000000472 sq mi (70031222000000000001,222 km2) |
|
| Minidoka County | 067 | Rupert | 1913 | Lincoln County | Disputed Native American origin, either Lakota for "a fountain or spring of water" or Shoshoni for "broad expanse." | 700420069000000000020,069 | 7002760000000000000760 sq mi (70031968000000000001,968 km2) |
|
| Nez Perce County | 069 | Lewiston | 1864 | Original county | The Nez Perce, a Native American tribe. | 700439265000000000039,265 | 7002849000000000000849 sq mi (70032199000000000002,199 km2) |
|
| Oneida County | 071 | Malad City | 1864 | Original County | Oneida Lake in New York state, where many early settlers were from. | 70034286000000000004,286 | 70031200000000000001,200 sq mi (70033108000000000003,108 km2) |
|
| Owyhee County | 073 | Murphy | 1863 | Original county | Corruption of Hawaii. Hawaiian fur trappers explored the area in 1819 and 1820. | 700411526000000000011,526 | 70037678000000000007,678 sq mi (700419886000000000019,886 km2) |
|
| Payette County | 075 | Payette | 1917 | Canyon County | Francois Payette, Canadian-born fur trader and early settler. | 700422623000000000022,623 | 7002408000000000000408 sq mi (70031057000000000001,057 km2) |
|
| Power County | 077 | American Falls | 1913 | Bingham, Blaine, and Oneida counties | The American Falls Power Plant | 70037817000000000007,817 | 70031406000000000001,406 sq mi (70033642000000000003,642 km2) |
|
| Shoshone County | 079 | Wallace | 1864 | Original county | Shoshone Native American tribe. | 700412765000000000012,765 | 70032634000000000002,634 sq mi (70036822000000000006,822 km2) |
|
| Teton County | 081 | Driggs | 1915 | Bingham, Fremont, and Madison counties | Teton Range and valley. | 700410170000000000010,170 | 7002450000000000000450 sq mi (70031165000000000001,165 km2) |
|
| Twin Falls County | 083 | Twin Falls | 1907 | Cassia County | Twin Falls waterfall on the Snake River. | 700477230000000000077,230 | 70031925000000000001,925 sq mi (70034986000000000004,986 km2) |
|
| Valley County | 085 | Cascade | 1917 | Boise and Idaho counties | Long Valley located in the county. | 70037651000000000007,651 | 70033733000000000003,733 sq mi (70039668000000000009,668 km2) |
|
| Washington County | 087 | Weiser | 1879 | Ada County | George Washington, first President of the United States . | 700410198000000000010,198 | 70031456000000000001,456 sq mi (70033771000000000003,771 km2) |
Read more about this topic: List Of Counties In Idaho
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