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Median Age in Idaho, by County

Median Age for every county in Idaho, ranked. The highest is Custer County at 60.0 and the lowest is Madison County at 21.4.

Idaho: 37.3 · United States: 38.9 · median county in Idaho: 39.0

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#County Median Age
1Custer County60.0
2Adams County53.9
3Boise County53.4
4Lemhi County53.3
5Clearwater County52.2
6Idaho County49.4
7Lewis County49.0
8Bonner County48.1
9Valley County46.9
10Blaine County45.6
11Benewah County45.5
12Washington County45.0
13Shoshone County44.8
14Gem County44.2
15Boundary County43.7
16Butte County41.3
17Nez Perce County41.2
18Kootenai County40.9
19Oneida County40.8
20Bear Lake County40.5
21Fremont County40.0
22Teton County39.6
23Owyhee County39.0
24Payette County38.9
25Caribou County38.5
26Ada County38.4
27Gooding County38.1
28Lincoln County37.2
29Camas County36.8
30Twin Falls County36.1
31Bannock County35.2
32Bingham County35.0
33Canyon County34.9
34Minidoka County34.9
35Power County34.6
36Jerome County34.0
37Bonneville County33.6
38Franklin County33.3
39Cassia County33.2
40Elmore County33.1
41Jefferson County32.8
42Clark County31.1
43Latah County30.6
44Madison County21.4

Half of residents are older than this and half are younger.

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

Idaho ranks 45th of 52 states for median age.

Median Age in other states

Other statistics for Idaho by county