Data / Rankings / Population aged 65 and over / Counties in Idaho

Counties in Idaho by share of population aged 65 and over

Lemhi County had the highest share of population aged 65 and over of 44 counties in 2024, at 32.6%. Madison County had the lowest, at 6.5%. The median was 21% and the figure for Idaho was 18.3%. Source: the U.S. Census Bureau.

Highest32.6Lemhi County
Lowest6.5Madison County
Median2144 counties
Idaho18.3History

All counties, 2024

CSVChart (SVG)

Lemhi CountyLemhi County: 32.6 %32.6Custer CountyCuster County: 32.2 %32.2Idaho CountyIdaho County: 31.8 %31.8Adams CountyAdams County: 31.5 %31.5Clearwater CountyClearwater County: 30.4 %30.4Boise CountyBoise County: 30.2 %30.2Camas CountyCamas County: 29.1 %29.1Lewis CountyLewis County: 28.8 %28.8Valley CountyValley County: 28.8 %28.8Bonner CountyBonner County: 27.7 %27.7Benewah CountyBenewah County: 26.7 %26.7Washington CountyWashington County: 26.1 %26.1Boundary CountyBoundary County: 25.8 %25.8Shoshone CountyShoshone County: 25.7 %25.7Butte CountyButte County: 25.3 %25.3Blaine CountyBlaine County: 25.2 %25.2Gem CountyGem County: 24.7 %24.7Bear Lake CountyBear Lake County: 23.3 %23.3Nez Perce CountyNez Perce County: 22.6 %22.6Kootenai CountyKootenai County: 22.1 %22.1Payette CountyPayette County: 21.2 %21.2Oneida CountyOneida County: 21 %21Clark CountyClark County: 21 %21Owyhee CountyOwyhee County: 19.3 %19.3Fremont CountyFremont County: 19.1 %19.1Caribou CountyCaribou County: 19 %19Gooding CountyGooding County: 18.8 %18.8Ada CountyAda County: 17.6 %17.6Twin Falls CountyTwin Falls County: 17.6 %17.6Minidoka CountyMinidoka County: 17.5 %17.5Power CountyPower County: 16.9 %16.9Lincoln CountyLincoln County: 16.8 %16.8Bannock CountyBannock County: 16.6 %16.6Bingham CountyBingham County: 16.3 %16.3Latah CountyLatah County: 16.2 %16.2Elmore CountyElmore County: 16 %16Franklin CountyFranklin County: 15.8 %15.8Cassia CountyCassia County: 15.8 %15.8Canyon CountyCanyon County: 15.5 %15.5Teton CountyTeton County: 15.4 %15.4Bonneville CountyBonneville County: 14.8 %14.8Jerome CountyJerome County: 14.4 %14.4Jefferson CountyJefferson County: 13.2 %13.2Madison CountyMadison County: 6.5 %6.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2024 (%)Change on 2023
1Lemhi County32.6+0.8 pts
2Custer County32.2+0.9 pts
3Idaho County31.8+0.8 pts
4Adams County31.5+0.1 pts
5Clearwater County30.4+0.6 pts
6Boise County30.2+1.3 pts
7Camas County29.1+0.5 pts
8Lewis County28.8+1.1 pts
9Valley County28.8+0.5 pts
10Bonner County27.7+0.4 pts
11Benewah County26.7+0.4 pts
12Washington County26.1+0.3 pts
13Boundary County25.8+0.1 pts
14Shoshone County25.7+0.4 pts
15Butte County25.3+0.8 pts
16Blaine County25.2+0.5 pts
17Gem County24.7+0.6 pts
18Bear Lake County23.3+0.9 pts
19Nez Perce County22.6+0.3 pts
20Kootenai County22.1+0.4 pts
21Payette County21.2+0.4 pts
22Oneida County210 pts
23Clark County21+0.8 pts
24Owyhee County19.3+0.6 pts
25Fremont County19.1+0.2 pts
26Caribou County19+0.1 pts
27Gooding County18.8+0.2 pts
28Ada County17.6+0.5 pts
29Twin Falls County17.6+0.3 pts
30Minidoka County17.5+0.4 pts
31Power County16.9+0.2 pts
32Lincoln County16.8+0.1 pts
33Bannock County16.6+0.4 pts
34Bingham County16.3+0.3 pts
35Latah County16.2+0.4 pts
36Elmore County16+0.6 pts
37Franklin County15.8+0.3 pts
38Cassia County15.80 pts
39Canyon County15.5+0.2 pts
40Teton County15.4+0.6 pts
41Bonneville County14.8+0.3 pts
42Jerome County14.4+0.1 pts
43Jefferson County13.2+0.4 pts
44Madison County6.5+0.1 pts

Other periods

About this ranking

Residents aged 65 or over as a percentage of total population. Spain: 1 January, INE annual census. United States: 1 July, Census Bureau population estimates. World Bank figures for other countries and the World refer to mid-year.

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. Population Estimates Program, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/asrh/cc-est2025-agesex-all.csv. Retrieved 2026-10-09.

Use this data in your AI agent

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Rank Counties in Idaho by share of population aged 65 and over using official data, and cite the source.
rank_places {"indicator":"population_65_plus_share","level":"province","within":"Idaho","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_share&level=province&within=Idaho&limit=10

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Questions

Which county has the highest share of population aged 65 and over?

Lemhi County, with 32.6% in 2024, according to the U.S. Census Bureau.

Which county has the lowest share of population aged 65 and over?

Madison County, with 6.5% in 2024.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. Retrieved 2026-10-09.

Population aged 65 and over: other rankings

Counties in Idaho: more rankings