Largest Counties in Idaho

Rank County Population County Seat Established Area (km2) Density
1 Ada County 392,354 Boise 1864 2,732 143.61
2 Canyon County 188,912 Caldwell 1892 1,528 123.63
3 Kootenai County 138,483 Coeur D alene 1864 3,225 42.94
4 Bonneville County 104,223 Idaho Falls 1911 4,841 21.53
5 Bannock County 82,828 Pocatello 1893 2,883 28.73
6 Twin Falls County 77,219 Twin Falls 1907 4,986 15.49
7 Bingham County 45,596 Blackfoot 1885 5,426 8.4
8 Bonner County 40,866 Sandpoint 1907 4,501 9.08
9 Nez Perce County 39,254 Lewiston 1864 2,199 17.85
10 Madison County 37,525 Rexburg 1913 1,222 30.71
11 Latah County 37,233 Moscow 1888 2,789 13.35
12 Elmore County 27,027 Mountain Home 1889 7,972 3.39
13 Jefferson County 26,129 Rigby 1913 2,836 9.21
14 Cassia County 22,941 Burley 1879 6,648 3.45
15 Payette County 22,612 Payette 1917 1,057 21.39
16 Jerome County 22,363 Jerome 1919 1,554 14.39
17 Blaine County 21,365 Hailey 1895 6,851 3.12
18 Minidoka County 20,058 Rupert 1913 1,968 10.19
19 Gem County 16,708 Emmett 1915 1,458 11.46
20 Idaho County 16,256 Grangeville 1864 21,976 0.74
21 Gooding County 15,453 Gooding 1913 1,893 8.16
22 Fremont County 13,231 Saint Anthony 1893 4,836 2.74
23 Franklin County 12,775 Preston 1913 1,725 7.41
24 Shoshone County 12,754 Wallace 1864 6,822 1.87
25 Owyhee County 11,515 Murphy 1863 19,886 0.58
26 Boundary County 10,961 Bonners Ferry 1915 3,287 3.33
27 Washington County 10,187 Weiser 1879 3,771 2.7
28 Teton County 10,159 Driggs 1915 1,165 8.72
29 Valley County 9,851 Cascade 1917 9,668 1.02
30 Benewah County 9,274 Saint Maries 1915 2,010 4.61
31 Clearwater County 8,750 Orofino 1911 6,377 1.37
32 Lemhi County 7,925 Salmon 1869 11,821 0.67
33 Power County 7,806 American Falls 1913 3,642 2.14
34 Boise County 7,017 Idaho City 1864 4,926 1.42
35 Caribou County 6,952 Soda Springs 1919 4,574 1.52
36 Bear Lake County 5,975 Paris 1875 2,515 2.38
37 Lincoln County 5,197 Shoshone 1895 3,124 1.66
38 Custer County 4,357 Challis 1881 12,758 0.34
39 Oneida County 4,275 Malad City 1864 3,108 1.38
40 Adams County 3,965 Council 1911 3,535 1.12
41 Lewis County 3,810 Nezperce 1911 1,241 3.07
42 Butte County 2,880 Arco 1917 5,783 0.5
43 Camas County 1,106 Fairfield 1917 2,784 0.4
44 Clark County 971 Dubois 1919 4,571 0.21

Largest Counties in Idaho

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