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Population per Square Mile in Idaho, by County

Population per Square Mile for every county in Idaho, ranked. The highest is Ada County at 493.2 and the lowest is Clark County at 0.5.

Idaho: 23.4 · United States: n/a · median county in Idaho: 9.5

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#County Population per Square Mile
1Ada County493.2
2Canyon County427.2
3Kootenai County147.0
4Madison County116.4
5Bannock County80.4
6Bonneville County69.4
7Payette County65.8
8Nez Perce County50.3
9Twin Falls County48.8
10Jerome County42.1
11Latah County38.2
12Gem County36.8
13Jefferson County30.3
14Bonner County29.5
15Minidoka County29.3
16Teton County27.7
17Bingham County23.7
18Franklin County22.7
19Gooding County21.8
20Benewah County13.1
21Boundary County10.4
22Cassia County9.9
23Blaine County9.5
24Elmore County9.5
25Lewis County7.7
26Washington County7.7
27Fremont County7.5
28Bear Lake County6.8
29Power County5.8
30Shoshone County5.2
31Lincoln County4.5
32Boise County4.4
33Caribou County4.1
34Oneida County4.0
35Clearwater County3.7
36Adams County3.5
37Valley County3.4
38Idaho County2.1
39Lemhi County1.8
40Owyhee County1.6
41Butte County1.2
42Camas County1.0
43Custer County0.9
44Clark County0.5

People divided by land area. Water is excluded, so lake and coastal counties are not unfairly diluted.

Source: ACS 2020-2024 5-Year Estimates, 2024.

Idaho ranks 46th of 52 states for population per square mile.

Population per Square Mile in other states

Other statistics for Idaho by county