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 2016, at 71.6%. Bear Lake County had the lowest, at 51.7%. The median was 55.5% and the figure for Idaho was 58.6%. Source: the U.S. Census Bureau.

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Highest71.6Madison County
Lowest51.7Bear Lake County
Median55.544 counties
Idaho58.6History

Map of counties, 2016

Ada County: 61.5 %Adams County: 55.5 %Bannock County: 59.6 %Bear Lake County: 51.7 %Benewah County: 53.8 %Bingham County: 54.8 %Blaine County: 58.5 %Boise County: 58.8 %Bonner County: 56.7 %Bonneville County: 56 %Boundary County: 54.2 %Butte County: 52.7 %Camas County: 56.3 %Canyon County: 56.8 %Caribou County: 52.9 %Cassia County: 53.7 %Clark County: 55.5 %Clearwater County: 55.8 %Custer County: 56.5 %Elmore County: 61.8 %Franklin County: 52.4 %Fremont County: 54.6 %Gem County: 54.1 %Gooding County: 55.4 %Idaho County: 54.1 %Jefferson County: 53.7 %Jerome County: 56.3 %Kootenai County: 58 %Latah County: 67.7 %Lemhi County: 52.6 %Lewis County: 54.1 %Lincoln County: 54.9 %Madison County: 71.6 %Minidoka County: 55.6 %Nez Perce County: 58.7 %Oneida County: 51.8 %Owyhee County: 55.3 %Payette County: 54.6 %Power County: 54.5 %Shoshone County: 57.5 %Teton County: 61.8 %Twin Falls County: 57 %Valley County: 58.2 %Washington County: 52.4 %
  • Under 54
  • 54 to 55
  • 55 to 57
  • 57 to 59
  • 59 and over
%, 2016. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2016

Madison County: 71.6 %Madison County71.6Latah County: 67.7 %Latah County67.7Teton County: 61.8 %Teton County61.8Elmore County: 61.8 %Elmore County61.8Ada County: 61.5 %Ada County61.5Bannock County: 59.6 %Bannock County59.6Boise County: 58.8 %Boise County58.8Nez Perce County: 58.7 %Nez Perce County58.7Blaine County: 58.5 %Blaine County58.5Valley County: 58.2 %Valley County58.2Kootenai County: 58 %Kootenai County58Shoshone County: 57.5 %Shoshone County57.5Twin Falls County: 57 %Twin Falls County57Canyon County: 56.8 %Canyon County56.8Bonner County: 56.7 %Bonner County56.7Custer County: 56.5 %Custer County56.5Jerome County: 56.3 %Jerome County56.3Camas County: 56.3 %Camas County56.3Bonneville County: 56 %Bonneville County56Clearwater County: 55.8 %Clearwater County55.8Minidoka County: 55.6 %Minidoka County55.6Clark County: 55.5 %Clark County55.5Adams County: 55.5 %Adams County55.5Gooding County: 55.4 %Gooding County55.4Owyhee County: 55.3 %Owyhee County55.3Lincoln County: 54.9 %Lincoln County54.9Bingham County: 54.8 %Bingham County54.8Fremont County: 54.6 %Fremont County54.6Payette County: 54.6 %Payette County54.6Power County: 54.5 %Power County54.5Boundary County: 54.2 %Boundary County54.2Gem County: 54.1 %Gem County54.1Idaho County: 54.1 %Idaho County54.1Lewis County: 54.1 %Lewis County54.1Benewah County: 53.8 %Benewah County53.8Cassia County: 53.7 %Cassia County53.7Jefferson County: 53.7 %Jefferson County53.7Caribou County: 52.9 %Caribou County52.9Butte County: 52.7 %Butte County52.7Lemhi County: 52.6 %Lemhi County52.6Franklin County: 52.4 %Franklin County52.4Washington County: 52.4 %Washington County52.4Oneida County: 51.8 %Oneida County51.8Bear Lake County: 51.7 %Bear Lake County51.7Madison County: 71.6 %Madison County71.6Latah County: 67.7 %Latah County67.7Teton County: 61.8 %Teton County61.8Elmore County: 61.8 %Elmore County61.8Ada County: 61.5 %Ada County61.5Bannock County: 59.6 %Bannock County59.6Boise County: 58.8 %Boise County58.8Nez Perce County: 58.7 %Nez Perce County58.7Blaine County: 58.5 %Blaine County58.5Valley County: 58.2 %Valley County58.2Kootenai County: 58 %Kootenai County58Shoshone County: 57.5 %Shoshone County57.5Twin Falls County: 57 %Twin Falls County57Canyon County: 56.8 %Canyon County56.8Bonner County: 56.7 %Bonner County56.7Custer County: 56.5 %Custer County56.5Jerome County: 56.3 %Jerome County56.3Camas County: 56.3 %Camas County56.3Bonneville County: 56 %Bonneville County56Clearwater County: 55.8 %Clearwater County55.8Minidoka County: 55.6 %Minidoka County55.6Clark County: 55.5 %Clark County55.5Adams County: 55.5 %Adams County55.5Gooding County: 55.4 %Gooding County55.4Owyhee County: 55.3 %Owyhee County55.3Lincoln County: 54.9 %Lincoln County54.9Bingham County: 54.8 %Bingham County54.8Fremont County: 54.6 %Fremont County54.6Payette County: 54.6 %Payette County54.6Power County: 54.5 %Power County54.5Boundary County: 54.2 %Boundary County54.2Gem County: 54.1 %Gem County54.1Idaho County: 54.1 %Idaho County54.1Lewis County: 54.1 %Lewis County54.1Benewah County: 53.8 %Benewah County53.8Cassia County: 53.7 %Cassia County53.7Jefferson County: 53.7 %Jefferson County53.7Caribou County: 52.9 %Caribou County52.9Butte County: 52.7 %Butte County52.7Lemhi County: 52.6 %Lemhi County52.6Franklin County: 52.4 %Franklin County52.4Washington County: 52.4 %Washington County52.4Oneida County: 51.8 %Oneida County51.8Bear Lake County: 51.7 %Bear Lake County51.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2016 (%)Change on 2015
1Madison County71.6+0.7 pts
2Latah County67.7-0.8 pts
3Teton County61.8+0.1 pts
4Elmore County61.8-0.1 pts
5Ada County61.5-0.2 pts
6Bannock County59.6-0.3 pts
7Boise County58.8-0.5 pts
8Nez Perce County58.7-0.3 pts
9Blaine County58.5-0.6 pts
10Valley County58.2-0.9 pts
11Kootenai County58-0.5 pts
12Shoshone County57.5-0 pts
13Twin Falls County57-0.2 pts
14Canyon County56.8-0.1 pts
15Bonner County56.7-0.7 pts
16Custer County56.5-1 pts
17Jerome County56.3+0.2 pts
18Camas County56.3+1.3 pts
19Bonneville County56-0.2 pts
20Clearwater County55.8-0.8 pts
21Minidoka County55.6-0 pts
22Clark County55.5+0.7 pts
23Adams County55.5-0.5 pts
24Gooding County55.4+0.5 pts
25Owyhee County55.3-0.7 pts
26Lincoln County54.9-0.8 pts
27Bingham County54.8-0.1 pts
28Fremont County54.6+0.2 pts
29Payette County54.6-0.4 pts
30Power County54.5-0.4 pts
31Boundary County54.2-0.3 pts
32Gem County54.1-0.5 pts
33Idaho County54.1-0.6 pts
34Lewis County54.1-0.3 pts
35Benewah County53.8-1.4 pts
36Cassia County53.7-0 pts
37Jefferson County53.70 pts
38Caribou County52.9-0.3 pts
39Butte County52.7-0.6 pts
40Lemhi County52.6-1 pts
41Franklin County52.4+0.3 pts
42Washington County52.4-0.4 pts
43Oneida County51.8-0.3 pts
44Bear Lake County51.7-0.2 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, 2016) [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, 2016. 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=2016. 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, 2016. 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=2016.

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, 2016 [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=2016 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_idaho_by_2016,
  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, 2016}},
  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=2016. 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, 2016
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=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/idaho-counties?period=2016.
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  -
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Rank Counties in Idaho by population aged 18 to 64 using official data, and cite the source.
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Questions

Which county has the highest population aged 18 to 64?

Madison County, with 71.6% in 2016, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Bear Lake County, with 51.7% in 2016.

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