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List of Idaho Counties and County Seats





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The U.S. state of Idaho is divided into 44 counties. Explore list of California Counties and their County Seats in alphabetical order populations, areas and the date of formation.

List of Idaho Counties and County Seat

S.NCountyCounty SeatPopulation(2011)Area Formed
1Ada CountyBoise392,3651,055 sq mi1864
2Adams CountyCouncil3,9761,365 sq mi1911
3Bannock CountyPocatello82,8391,113 sq mi1893
4Bear Lake CountyParis5,986971 sq mi1893
5Benewah CountySt. Maries9,285776 sq mi1915
6Bingham CountyBlackfoot45,6072,095 sq mi1885
7Blaine CountyHailey21,3762,645 sq mi1895
8Boise CountyIdaho City7,0281,902 sq mi1864
9Bonner CountySandpoint40,8771,738 sq mi1907
10Bonneville CountyIdaho Falls104,2341,869 sq mi1911
11Boundary CountyBonners Ferry10,9721,269 sq mi1915
12Butte CountyArco2,8912,233 sq mi1917
13Camas CountyFairfield1,1171,075 sq mi1917
14Canyon CountyCaldwell188,923590 sq mi1892
15Caribou CountySoda Springs6,9631,766 sq mi1919
16Cassia CountyBurley22,9522,567 sq mi1879
17Clark CountyDubois9821,765 sq mi1919
18Clearwater CountyOrofino8,7612,462 sq mi1911
19Custer CountyChallis4,3684,926 sq mi1881
20Elmore CountyMountain Home27,0383,078 sq mi1889
21Franklin CountyPreston12,786666 sq mi1913
22Fremont CountySaint Anthony13,2421,867 sq mi1893
23Gem CountyEmmett16,719563 sq mi1915
24Gooding CountyGooding15,464731 sq mi1913
25Idaho CountyGrangeville16,2678,485 sq mi1864
26Jefferson CountyRigby26,1401,095 sq mi1913
27Jerome CountyJerome22,374600 sq mi1919
28Kootenai CountyCoeur d'Alene138,4941,245 sq mi1864
29Latah CountyMoscow37,2441,077 sq mi1888
30Lemhi CountySalmon7,9364,564 sq mi1869
31Lewis CountyNezperce3,821479 sq mi1911
32Lincoln CountyShoshone5,2081,206 sq mi1895
33Madison CountyRexburg37,536472 sq mi1913
34Minidoka CountyRupert20,069760 sq mi1913
35Nez Perce CountyLewiston39,265849 sq mi1864
36Oneida CountyMalad City4,2861,200 sq mi1864
37Owyhee CountyMurphy11,5267,678 sq mi1863
38Payette CountyPayette22,623408 sq mi1917
39Power CountyAmerican Falls7,8171,406 sq mi1913
40Shoshone CountyWallace12,7652,634 sq mi1864
41Teton CountyDriggs10,170450 sq mi1915
42Twin Falls CountyTwin Falls77,2301,925 sq mi1907
43Valley CountyCascade9,8623,733 sq mi1917
44Washington CountyWeiser10,1981,456 sq mi1879