List of Idaho counties

Counties of Idaho
Ada Adams Ban- nock Bear Lake Bene- wah Bingham Blaine Boise Bonner Bonneville Boundary Butte Camas Can- yon Caribou Cassia Clark Clearwater Custer Elmore Frank- lin Fremont Gem Good- ing Idaho Jeffer- son Jerome Koote- nai Latah Lemhi Lewis Lincoln Madi- son Mini- doka Nez Perce Oneida Owyhee Pay- ette Power Shoshone Te- ton Twin Falls Valley Wash- ington
Location	State of Idaho
Number	44
Populations	982 (Clark) – 392,365 (Ada)
Areas	408 square miles (1,060 km2) (Payette) – 8,485 square miles (21,980 km2) (Idaho)
Government	County government
Subdivisions	cities, towns, townships, unincorporated communities, indian reservations, census designated place

There are 44 counties in the U.S. state of Idaho.

The Idaho Territory was organized in March 1863, and Owyhee County was the first county in the territory to be organized, in December of that year. Oneida County was organized in January 1864, while Missoula County was adopted the same month, before becoming part of the new Montana Territory in May. Shoshone, Nez Perce, Idaho and Boise Counties were recognized in February 1864; Alturas County was organized the same month. In December 1864, Kootenai and Ada Counties were created; Lah-Toh County was also created at this time but was abolished in 1867.

Idaho's present-day boundaries were established in 1868, and Lemhi County was created the following year. By the time Idaho was admitted to the Union as the 43rd state in 1890, a further eight counties had been created, bringing the total to 18. After Canyon, Fremont and Bannock Counties had been created, Alturas and Logan Counties were merged to form Blaine County in March 1895; Lincoln County was formed out of Blaine County later the same month. Bonner and Twin Falls Counties were created in 1907, before a further 21 counties were created between 1911 and 1919, bringing the total to the present-day 44.

Since 1945, each county has used a code on its license plates that features the first letter of the county's name. Where the names of two or more counties start with the same letter, in each of these counties the letter is preceded by a number indicating that county's order in the alphabetical list. For instance, the four counties beginning with 'L' in alphabetical order are Latah, Lemhi, Lewis and Lincoln; the codes for these counties are thus 1L, 2L, 3L and 4L respectively. Elmore, Idaho, Kootenai, Nez Perce, Shoshone, Valley, and Washington Counties are the only ones in the state with their respective first letters; in these counties, the letter alone serves as the code.

In some fourth grade classrooms, students memorize the counties with the following poem:

Counties of Idaho Poem
Ada is first with our capital town,
Adams’ Seven Devils go straight up and down.
Then ten counties start with B;
Bannock, Bear Lake, Benewah three;
Bingham, Blaine, Boise, Bonner,
Bonneville, Boundary, Butte make ten.
Then the next seven start with C:
Camas, Canyon, Caribou three.
Cassia, Clark, Clearwater, Custer,
Are the Idaho C’s we can muster.
Elmore, Franklin, Fremont, Gem,
Gooding and Idaho don’t forget them.
Flatlands of Jefferson,
Potatoes of Jerome,
Kootenai, Latah, we’re almost home.
Lemhi and Lewis,
Hurry, hurry, hurry!
Lincoln with its ice caves
Very very burry.
Madison, Minidoka, Nez Perce;
Our Indian accent grows worse and worse.
Oneida, Owyhee, a little faster please
Payette and Power are the only Ps.
Shoshone, Teton, Twin Falls, almost done,
Valley County and Washington.
Author unknown