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 2014, at 70.5%. Franklin County had the lowest, at 51.9%. The median was 55.9% and the figure for Idaho was 59.1%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest70.5Madison County
Lowest51.9Franklin County
Median55.944 counties
Idaho59.1History

Map of counties, 2014

Ada County: 62 %Adams County: 57.3 %Bannock County: 60.2 %Bear Lake County: 52.4 %Benewah County: 55.9 %Bingham County: 55 %Blaine County: 60.3 %Boise County: 59.8 %Bonner County: 58.2 %Bonneville County: 56.4 %Boundary County: 55.5 %Butte County: 54 %Camas County: 55.9 %Canyon County: 57.1 %Caribou County: 53.7 %Cassia County: 54 %Clark County: 55.5 %Clearwater County: 57.1 %Custer County: 59 %Elmore County: 61.8 %Franklin County: 51.9 %Fremont County: 54.3 %Gem County: 54.8 %Gooding County: 55 %Idaho County: 55.5 %Jefferson County: 53.9 %Jerome County: 56.6 %Kootenai County: 59 %Latah County: 69.3 %Lemhi County: 54.2 %Lewis County: 54.3 %Lincoln County: 55.6 %Madison County: 70.5 %Minidoka County: 55.7 %Nez Perce County: 59.2 %Oneida County: 53 %Owyhee County: 56.4 %Payette County: 55.3 %Power County: 55.1 %Shoshone County: 58.3 %Teton County: 62 %Twin Falls County: 57.4 %Valley County: 59.5 %Washington County: 53.7 %
  • Under 54
  • 54 to 55
  • 55 to 56
  • 56 to 57
  • 57 to 60
  • 60 and over
%, 2014. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2014

Madison County: 70.5 %Madison County70.5Latah County: 69.3 %Latah County69.3Teton County: 62 %Teton County62Ada County: 62 %Ada County62Elmore County: 61.8 %Elmore County61.8Blaine County: 60.3 %Blaine County60.3Bannock County: 60.2 %Bannock County60.2Boise County: 59.8 %Boise County59.8Valley County: 59.5 %Valley County59.5Nez Perce County: 59.2 %Nez Perce County59.2Custer County: 59 %Custer County59Kootenai County: 59 %Kootenai County59Shoshone County: 58.3 %Shoshone County58.3Bonner County: 58.2 %Bonner County58.2Twin Falls County: 57.4 %Twin Falls County57.4Adams County: 57.3 %Adams County57.3Clearwater County: 57.1 %Clearwater County57.1Canyon County: 57.1 %Canyon County57.1Jerome County: 56.6 %Jerome County56.6Bonneville County: 56.4 %Bonneville County56.4Owyhee County: 56.4 %Owyhee County56.4Benewah County: 55.9 %Benewah County55.9Camas County: 55.9 %Camas County55.9Minidoka County: 55.7 %Minidoka County55.7Lincoln County: 55.6 %Lincoln County55.6Clark County: 55.5 %Clark County55.5Idaho County: 55.5 %Idaho County55.5Boundary County: 55.5 %Boundary County55.5Payette County: 55.3 %Payette County55.3Power County: 55.1 %Power County55.1Bingham County: 55 %Bingham County55Gooding County: 55 %Gooding County55Gem County: 54.8 %Gem County54.8Fremont County: 54.3 %Fremont County54.3Lewis County: 54.3 %Lewis County54.3Lemhi County: 54.2 %Lemhi County54.2Butte County: 54 %Butte County54Cassia County: 54 %Cassia County54Jefferson County: 53.9 %Jefferson County53.9Caribou County: 53.7 %Caribou County53.7Washington County: 53.7 %Washington County53.7Oneida County: 53 %Oneida County53Bear Lake County: 52.4 %Bear Lake County52.4Franklin County: 51.9 %Franklin County51.9Madison County: 70.5 %Madison County70.5Latah County: 69.3 %Latah County69.3Teton County: 62 %Teton County62Ada County: 62 %Ada County62Elmore County: 61.8 %Elmore County61.8Blaine County: 60.3 %Blaine County60.3Bannock County: 60.2 %Bannock County60.2Boise County: 59.8 %Boise County59.8Valley County: 59.5 %Valley County59.5Nez Perce County: 59.2 %Nez Perce County59.2Custer County: 59 %Custer County59Kootenai County: 59 %Kootenai County59Shoshone County: 58.3 %Shoshone County58.3Bonner County: 58.2 %Bonner County58.2Twin Falls County: 57.4 %Twin Falls County57.4Adams County: 57.3 %Adams County57.3Clearwater County: 57.1 %Clearwater County57.1Canyon County: 57.1 %Canyon County57.1Jerome County: 56.6 %Jerome County56.6Bonneville County: 56.4 %Bonneville County56.4Owyhee County: 56.4 %Owyhee County56.4Benewah County: 55.9 %Benewah County55.9Camas County: 55.9 %Camas County55.9Minidoka County: 55.7 %Minidoka County55.7Lincoln County: 55.6 %Lincoln County55.6Clark County: 55.5 %Clark County55.5Idaho County: 55.5 %Idaho County55.5Boundary County: 55.5 %Boundary County55.5Payette County: 55.3 %Payette County55.3Power County: 55.1 %Power County55.1Bingham County: 55 %Bingham County55Gooding County: 55 %Gooding County55Gem County: 54.8 %Gem County54.8Fremont County: 54.3 %Fremont County54.3Lewis County: 54.3 %Lewis County54.3Lemhi County: 54.2 %Lemhi County54.2Butte County: 54 %Butte County54Cassia County: 54 %Cassia County54Jefferson County: 53.9 %Jefferson County53.9Caribou County: 53.7 %Caribou County53.7Washington County: 53.7 %Washington County53.7Oneida County: 53 %Oneida County53Bear Lake County: 52.4 %Bear Lake County52.4Franklin County: 51.9 %Franklin County51.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2014 (%)Change on 2013
1Madison County70.5+0.5 pts
2Latah County69.3-0.5 pts
3Teton County62-0.2 pts
4Ada County62-0.3 pts
5Elmore County61.8-0.4 pts
6Blaine County60.3-0.8 pts
7Bannock County60.2-0.4 pts
8Boise County59.8-0.3 pts
9Valley County59.5-1.2 pts
10Nez Perce County59.2-0.3 pts
11Custer County59-0.5 pts
12Kootenai County59-0.5 pts
13Shoshone County58.3-0.8 pts
14Bonner County58.2-0.8 pts
15Twin Falls County57.4-0.2 pts
16Adams County57.3-0.6 pts
17Clearwater County57.1-1.3 pts
18Canyon County57.1-0.1 pts
19Jerome County56.6-0.3 pts
20Bonneville County56.4-0.3 pts
21Owyhee County56.4-0.1 pts
22Benewah County55.9-0.3 pts
23Camas County55.9-2.5 pts
24Minidoka County55.7-0.6 pts
25Lincoln County55.60 pts
26Clark County55.5-1.4 pts
27Idaho County55.5-0.5 pts
28Boundary County55.5-0.1 pts
29Payette County55.3-0.5 pts
30Power County55.1-0.8 pts
31Bingham County55-0.3 pts
32Gooding County550 pts
33Gem County54.8-0.5 pts
34Fremont County54.3-0.4 pts
35Lewis County54.3-0.7 pts
36Lemhi County54.2-1.4 pts
37Butte County54-0.3 pts
38Cassia County54-0.2 pts
39Jefferson County53.9-0.6 pts
40Caribou County53.7-0.3 pts
41Washington County53.7-0.7 pts
42Oneida County53-0.4 pts
43Bear Lake County52.4-0.1 pts
44Franklin County51.90 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, 2014) [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, 2014. 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=2014. 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, 2014. 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=2014.

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, 2014 [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=2014 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_idaho_by_2014,
  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, 2014}},
  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=2014. 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, 2014
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=2014
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/idaho-counties?period=2014.
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 70.5% in 2014, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Franklin County, with 51.9% in 2014.

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