Data / Rankings / Population aged 18 to 64 / Counties in Idaho

Counties in Idaho by population aged 18 to 64

Madison County had the highest population aged 18 to 64 of 44 counties in 2022, at 72.5%. Idaho County had the lowest, at 50.1%. The median was 54.4% and the figure for Idaho was 58%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest72.5Madison County
Lowest50.1Idaho County
Median54.444 counties
Idaho58History

Map of counties, 2022

Ada County: 61.1 %Adams County: 51.4 %Bannock County: 58.5 %Bear Lake County: 50.8 %Benewah County: 52 %Bingham County: 54.8 %Blaine County: 56.8 %Boise County: 55.3 %Bonner County: 53.5 %Bonneville County: 56.2 %Boundary County: 50.8 %Butte County: 51.9 %Camas County: 53.3 %Canyon County: 57.8 %Caribou County: 52.7 %Cassia County: 53.6 %Clark County: 52.9 %Clearwater County: 53.8 %Custer County: 52 %Elmore County: 60.9 %Franklin County: 53.6 %Fremont County: 55.3 %Gem County: 53.6 %Gooding County: 54.9 %Idaho County: 50.1 %Jefferson County: 54.5 %Jerome County: 56.2 %Kootenai County: 56.4 %Latah County: 64.6 %Lemhi County: 50.2 %Lewis County: 51.2 %Lincoln County: 56.5 %Madison County: 72.5 %Minidoka County: 55.1 %Nez Perce County: 56.9 %Oneida County: 51.5 %Owyhee County: 55.4 %Payette County: 54.1 %Power County: 53.9 %Shoshone County: 54.4 %Teton County: 62.5 %Twin Falls County: 56.4 %Valley County: 54.4 %Washington County: 51.6 %
  • Under 52
  • 52 to 54
  • 54 to 55
  • 55 to 57
  • 57 and over
%, 2022. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2022

Madison County: 72.5 %Madison County72.5Latah County: 64.6 %Latah County64.6Teton County: 62.5 %Teton County62.5Ada County: 61.1 %Ada County61.1Elmore County: 60.9 %Elmore County60.9Bannock County: 58.5 %Bannock County58.5Canyon County: 57.8 %Canyon County57.8Nez Perce County: 56.9 %Nez Perce County56.9Blaine County: 56.8 %Blaine County56.8Lincoln County: 56.5 %Lincoln County56.5Twin Falls County: 56.4 %Twin Falls County56.4Kootenai County: 56.4 %Kootenai County56.4Jerome County: 56.2 %Jerome County56.2Bonneville County: 56.2 %Bonneville County56.2Owyhee County: 55.4 %Owyhee County55.4Boise County: 55.3 %Boise County55.3Fremont County: 55.3 %Fremont County55.3Minidoka County: 55.1 %Minidoka County55.1Gooding County: 54.9 %Gooding County54.9Bingham County: 54.8 %Bingham County54.8Jefferson County: 54.5 %Jefferson County54.5Shoshone County: 54.4 %Shoshone County54.4Valley County: 54.4 %Valley County54.4Payette County: 54.1 %Payette County54.1Power County: 53.9 %Power County53.9Clearwater County: 53.8 %Clearwater County53.8Franklin County: 53.6 %Franklin County53.6Cassia County: 53.6 %Cassia County53.6Gem County: 53.6 %Gem County53.6Bonner County: 53.5 %Bonner County53.5Camas County: 53.3 %Camas County53.3Clark County: 52.9 %Clark County52.9Caribou County: 52.7 %Caribou County52.7Custer County: 52 %Custer County52Benewah County: 52 %Benewah County52Butte County: 51.9 %Butte County51.9Washington County: 51.6 %Washington County51.6Oneida County: 51.5 %Oneida County51.5Adams County: 51.4 %Adams County51.4Lewis County: 51.2 %Lewis County51.2Bear Lake County: 50.8 %Bear Lake County50.8Boundary County: 50.8 %Boundary County50.8Lemhi County: 50.2 %Lemhi County50.2Idaho County: 50.1 %Idaho County50.1Madison County: 72.5 %Madison County72.5Latah County: 64.6 %Latah County64.6Teton County: 62.5 %Teton County62.5Ada County: 61.1 %Ada County61.1Elmore County: 60.9 %Elmore County60.9Bannock County: 58.5 %Bannock County58.5Canyon County: 57.8 %Canyon County57.8Nez Perce County: 56.9 %Nez Perce County56.9Blaine County: 56.8 %Blaine County56.8Lincoln County: 56.5 %Lincoln County56.5Twin Falls County: 56.4 %Twin Falls County56.4Kootenai County: 56.4 %Kootenai County56.4Jerome County: 56.2 %Jerome County56.2Bonneville County: 56.2 %Bonneville County56.2Owyhee County: 55.4 %Owyhee County55.4Boise County: 55.3 %Boise County55.3Fremont County: 55.3 %Fremont County55.3Minidoka County: 55.1 %Minidoka County55.1Gooding County: 54.9 %Gooding County54.9Bingham County: 54.8 %Bingham County54.8Jefferson County: 54.5 %Jefferson County54.5Shoshone County: 54.4 %Shoshone County54.4Valley County: 54.4 %Valley County54.4Payette County: 54.1 %Payette County54.1Power County: 53.9 %Power County53.9Clearwater County: 53.8 %Clearwater County53.8Franklin County: 53.6 %Franklin County53.6Cassia County: 53.6 %Cassia County53.6Gem County: 53.6 %Gem County53.6Bonner County: 53.5 %Bonner County53.5Camas County: 53.3 %Camas County53.3Clark County: 52.9 %Clark County52.9Caribou County: 52.7 %Caribou County52.7Custer County: 52 %Custer County52Benewah County: 52 %Benewah County52Butte County: 51.9 %Butte County51.9Washington County: 51.6 %Washington County51.6Oneida County: 51.5 %Oneida County51.5Adams County: 51.4 %Adams County51.4Lewis County: 51.2 %Lewis County51.2Bear Lake County: 50.8 %Bear Lake County50.8Boundary County: 50.8 %Boundary County50.8Lemhi County: 50.2 %Lemhi County50.2Idaho County: 50.1 %Idaho County50.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1Madison County72.5-0.5 pts
2Latah County64.6-0.5 pts
3Teton County62.5+0.5 pts
4Ada County61.1-0 pts
5Elmore County60.9-0.1 pts
6Bannock County58.5-0 pts
7Canyon County57.8+0.2 pts
8Nez Perce County56.9-0.4 pts
9Blaine County56.8-0.3 pts
10Lincoln County56.5+0.1 pts
11Twin Falls County56.4+0.1 pts
12Kootenai County56.4-0.2 pts
13Jerome County56.2-0 pts
14Bonneville County56.2+0.2 pts
15Owyhee County55.4-0.3 pts
16Boise County55.3-0.4 pts
17Fremont County55.3+0.2 pts
18Minidoka County55.1-0.2 pts
19Gooding County54.9+0.3 pts
20Bingham County54.8+0.2 pts
21Jefferson County54.5+0.4 pts
22Shoshone County54.4-0.4 pts
23Valley County54.4-0.5 pts
24Payette County54.1+0.1 pts
25Power County53.9+0.2 pts
26Clearwater County53.8-0.7 pts
27Franklin County53.6+0.5 pts
28Cassia County53.6-0.2 pts
29Gem County53.6+0.2 pts
30Bonner County53.5-0.2 pts
31Camas County53.3-1 pts
32Clark County52.9+0.1 pts
33Caribou County52.7+0.1 pts
34Custer County52-0.7 pts
35Benewah County52-0.4 pts
36Butte County51.9-0.3 pts
37Washington County51.6+0.7 pts
38Oneida County51.5-0.4 pts
39Adams County51.4-0.3 pts
40Lewis County51.2-0.5 pts
41Bear Lake County50.8-0.3 pts
42Boundary County50.8-0 pts
43Lemhi County50.2-0.6 pts
44Idaho County50.1-0.4 pts

Other periods

About this ranking

Residents aged 18 to 64 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Not comparable with working-age shares for ages 15 to 64 used in EU and World Bank statistics.

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: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in Idaho by population aged 18 to 64, 2022) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Idaho by population aged 18 to 64, 2022. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-18-64/idaho-counties?period=2022. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in Idaho by population aged 18 to 64, 2022. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-18-64/idaho-counties?period=2022.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Idaho by population aged 18 to 64, 2022 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/idaho-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_idaho_by_2022,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Idaho by population aged 18 to 64, 2022}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/population-18-64/idaho-counties?period=2022. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Idaho by population aged 18 to 64, 2022
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/population-18-64/idaho-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/idaho-counties?period=2022.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

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 population aged 18 to 64 using official data, and cite the source.
rank_places {"indicator":"population_18_64_share","level":"province","within":"Idaho","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_18_64_share&level=province&within=Idaho&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population aged 18 to 64?

Madison County, with 72.5% in 2022, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Idaho County, with 50.1% 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, Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population aged 18 to 64: other rankings

Counties in Idaho: more rankings