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 2023, at 31.8%. Madison County had the lowest, at 6.4%. The median was 20.5% and the figure for Idaho was 17.9%. Source: the U.S. Census Bureau.

Highest31.8Lemhi County
Lowest6.4Madison County
Median20.544 counties
Idaho17.9History

All counties, 2023

CSVChart (SVG)

Lemhi CountyLemhi County: 31.8 %31.8Adams CountyAdams County: 31.4 %31.4Custer CountyCuster County: 31.3 %31.3Idaho CountyIdaho County: 30.9 %30.9Clearwater CountyClearwater County: 29.8 %29.8Boise CountyBoise County: 28.8 %28.8Camas CountyCamas County: 28.6 %28.6Valley CountyValley County: 28.3 %28.3Lewis CountyLewis County: 27.8 %27.8Bonner CountyBonner County: 27.4 %27.4Benewah CountyBenewah County: 26.3 %26.3Washington CountyWashington County: 25.8 %25.8Boundary CountyBoundary County: 25.6 %25.6Shoshone CountyShoshone County: 25.3 %25.3Blaine CountyBlaine County: 24.6 %24.6Butte CountyButte County: 24.4 %24.4Gem CountyGem County: 24.1 %24.1Bear Lake CountyBear Lake County: 22.4 %22.4Nez Perce CountyNez Perce County: 22.3 %22.3Kootenai CountyKootenai County: 21.7 %21.7Oneida CountyOneida County: 21 %21Payette CountyPayette County: 20.8 %20.8Clark CountyClark County: 20.2 %20.2Caribou CountyCaribou County: 18.9 %18.9Fremont CountyFremont County: 18.9 %18.9Owyhee CountyOwyhee County: 18.7 %18.7Gooding CountyGooding County: 18.6 %18.6Twin Falls CountyTwin Falls County: 17.4 %17.4Ada CountyAda County: 17.1 %17.1Minidoka CountyMinidoka County: 17 %17Power CountyPower County: 16.7 %16.7Lincoln CountyLincoln County: 16.7 %16.7Bannock CountyBannock County: 16.2 %16.2Bingham CountyBingham County: 16 %16Latah CountyLatah County: 15.8 %15.8Cassia CountyCassia County: 15.8 %15.8Franklin CountyFranklin County: 15.5 %15.5Elmore CountyElmore County: 15.4 %15.4Canyon CountyCanyon County: 15.3 %15.3Teton CountyTeton County: 14.8 %14.8Bonneville CountyBonneville County: 14.5 %14.5Jerome CountyJerome County: 14.3 %14.3Jefferson CountyJefferson County: 12.8 %12.8Madison CountyMadison County: 6.4 %6.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2023 (%)Change on 2022
1Lemhi County31.8+0.2 pts
2Adams County31.4+0.2 pts
3Custer County31.3+0.7 pts
4Idaho County30.9+0.6 pts
5Clearwater County29.8-0.1 pts
6Boise County28.8+1.2 pts
7Camas County28.6+1.4 pts
8Valley County28.3+0.9 pts
9Lewis County27.8+1 pts
10Bonner County27.4+0.5 pts
11Benewah County26.3+0.7 pts
12Washington County25.8+0.1 pts
13Boundary County25.6+0.4 pts
14Shoshone County25.3+0.1 pts
15Blaine County24.6+0.9 pts
16Butte County24.4+0.6 pts
17Gem County24.1+0.4 pts
18Bear Lake County22.4+0.9 pts
19Nez Perce County22.3+0.4 pts
20Kootenai County21.7+0.5 pts
21Oneida County21-0.2 pts
22Payette County20.8+0.5 pts
23Clark County20.2+1.4 pts
24Caribou County18.9+0.2 pts
25Fremont County18.9+0.3 pts
26Owyhee County18.7+0.4 pts
27Gooding County18.60 pts
28Twin Falls County17.4+0.2 pts
29Ada County17.1+0.6 pts
30Minidoka County17+0.3 pts
31Power County16.7+0.1 pts
32Lincoln County16.7+0.4 pts
33Bannock County16.2+0.3 pts
34Bingham County16+0.4 pts
35Latah County15.8+0.4 pts
36Cassia County15.8+0.2 pts
37Franklin County15.50 pts
38Elmore County15.4+0.5 pts
39Canyon County15.3+0.1 pts
40Teton County14.8+0.8 pts
41Bonneville County14.5+0.3 pts
42Jerome County14.3+0.3 pts
43Jefferson County12.8+0.2 pts
44Madison County6.4+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

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

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 31.8% in 2023, according to the U.S. Census Bureau.

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

Madison County, with 6.4% in 2023.

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