Counties in Idaho by median age

Name: Counties in Idaho by median age, 2022
Creator: U.S. Census Bureau
License: Public domain (US federal government work, citation requested)

Custer County had the highest median age of 44 counties in 2022, at 55.5 years. Madison County had the lowest, at 21.6 years. The median was 39 years and the figure for Idaho was 36.9 years. Source: the U.S. Census Bureau.

Highest55.5Custer County

Lowest21.6Madison County

Median3944 counties

Idaho36.9History

All counties, 2022

CSV Chart (SVG)

years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

Rank	Counties	2022 years	Change on 2021
1	Custer County	55.5	+2.1
2	Adams County	54.4	-0.3
3	Boise County	53.7	0
4	Lemhi County	53.2	+0.4
5	Clearwater County	52.3	+1.3
6	Idaho County	49.5	-0.6
7	Lewis County	49.1	+0.1
8	Valley County	48.9	-1.3
9	Bonner County	48.3	+0.1
10	Shoshone County	46.1	-0.2
11	Benewah County	45.9	0
12	Washington County	44.7	-0.2
13	Blaine County	44.5	+0.7
14	Gem County	44	-0.7
15	Boundary County	43.6	-0.2
16	Butte County	43.1	-1.2
17	Kootenai County	40.7	+0.3
17	Nez Perce County	40.7	+0.1
19	Bear Lake County	40	+1.1
19	Payette County	40	0
21	Oneida County	39.7	-1.9
22	Fremont County	39	+1.1
23	Owyhee County	38.9	-1.1
24	Teton County	38.6	+0.3
25	Gooding County	38.3	+0.1
26	Ada County	38.1	+0.4
27	Caribou County	37.9	+0.4
28	Clark County	37.6	+3.8
29	Lincoln County	37.3	+0.9
30	Camas County	36.5	-7.5
31	Twin Falls County	35.5	+0.2
32	Power County	35.3	-0.9
33	Minidoka County	34.9	-0.2
34	Bannock County	34.7	+0.2
35	Canyon County	34.4	+0.3
36	Bingham County	34.3	+0.1
37	Bonneville County	33.2	+0.2
38	Cassia County	33.1	-0.1
39	Jerome County	33	+0.1
40	Franklin County	32.6	-0.6
41	Elmore County	32.3	-0.3
42	Jefferson County	31.7	-0.2
43	Latah County	30.3	+0.2
44	Madison County	21.6	-1.7

Other periods

2024
2023
2022
2021

About this ranking

Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b01002.dat. Retrieved 2026-10-08.

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Rank Counties in Idaho by median age using official data, and cite the source.

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Questions

Which county has the highest median age?

Custer County, with 55.5 years in 2022, according to the U.S. Census Bureau.

Which county has the lowest median age?

Madison County, with 21.6 years in 2022.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved 2026-10-08.