Data / Population aged 18 to 64 / Idaho County

Population aged 18 to 64 in Idaho County

Population aged 18 to 64 in Idaho County was 48% in 2025, according to the U.S. Census Bureau. That is down 0.6 pts from 2024. That is the 44th highest of 44 counties in 2025.

202548%
Change on 2024-0.6 pts
Rank44th of 44Counties in Idaho ranked
Series high57.82010
Series low482025

Next release: Friday, 25 June 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Population aged 18 to 64 in Idaho County, 2010 to 2025

464850525456582010201320162019202220252010: 57.8 %2011: 57.6 %2012: 56.6 %2013: 56.1 %2014: 55.5 %2015: 54.7 %2016: 54.1 %2017: 53.1 %2018: 52.2 %2019: 51.7 %2020: 50.8 %2021: 50.6 %2022: 50.1 %2023: 49.2 %2024: 48.6 %2025: 48 %47.55052.55557.5602010201620252010: 57.8 %2011: 57.6 %2012: 56.6 %2013: 56.1 %2014: 55.5 %2015: 54.7 %2016: 54.1 %2017: 53.1 %2018: 52.2 %2019: 51.7 %2020: 50.8 %2021: 50.6 %2022: 50.1 %2023: 49.2 %2024: 48.6 %2025: 48 %
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12, published 2026-06-25.
All 16 values
Period%
202548
202448.6
202349.2
202250.1
202150.6
202050.8
201951.7
201852.2
201753.1
201654.1
201554.7
201455.5
201356.1
201256.6
201157.6
201057.8

Compared with Idaho and United States

Place2025
Idaho County48
Idaho58.1
United States60

Idaho County compared with nearby places

Ada County: 61 %Adams County: 51.4 %Bannock County: 58.7 %Bear Lake County: 50.9 %Benewah County: 51.2 %Bingham County: 55.6 %Blaine County: 56.4 %Boise County: 53.4 %Bonner County: 52.4 %Bonneville County: 56.9 %Boundary County: 50.6 %Butte County: 50.9 %Camas County: 51.1 %Canyon County: 58.5 %Caribou County: 53 %Cassia County: 54.6 %Clark County: 52.2 %Clearwater County: 53.2 %Custer County: 50.2 %Elmore County: 60 %Franklin County: 54.6 %Fremont County: 56 %Gem County: 53 %Gooding County: 56.1 %Idaho County: 48 %Jefferson County: 55.9 %Jerome County: 56.2 %Kootenai County: 55.7 %Latah County: 63.5 %Lemhi County: 49.6 %Lewis County: 50 %Lincoln County: 56.8 %Madison County: 71.8 %Minidoka County: 55.1 %Nez Perce County: 56.6 %Oneida County: 51 %Owyhee County: 56.6 %Payette County: 54 %Power County: 55.5 %Shoshone County: 53.7 %Teton County: 63.1 %Twin Falls County: 56.9 %Valley County: 52.9 %Washington County: 52.6 %
  • Under 51
  • 51 to 53
  • 53 to 55
  • 55 to 56
  • 56 to 57
  • 57 and over
Population aged 18 to 64, 2025, %. Idaho County is outlined. Same source and period for every area shown. Source: U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

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.

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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 (Population aged 18 to 64, Idaho County, 2010 to 2025) [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, Population aged 18 to 64, Idaho County, 2010 to 2025. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/en/population-18-64/idaho-county-idaho. 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. Population aged 18 to 64, Idaho County, 2010 to 2025. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/en/population-18-64/idaho-county-idaho.

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, Population aged 18 to 64, Idaho County, 2010 to 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/en/population-18-64/idaho-county-idaho (Accessed: 12 October 2026).

BibTeX
@misc{census_population_aged_18_to_2025,
  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: Population aged 18 to 64, Idaho County, 2010 to 2025}},
  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/en/population-18-64/idaho-county-idaho. 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: Population aged 18 to 64, Idaho County, 2010 to 2025
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/en/population-18-64/idaho-county-idaho
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/population-18-64/idaho-county-idaho.
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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Questions

What is the population aged 18 to 64 in Idaho County?

Population aged 18 to 64 in Idaho County was 48% in 2025, according to the U.S. Census Bureau. That is down 0.6 pts from 2024. That is the 44th highest of 44 counties in 2025.

Where does this figure come from?

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 by Invokely on 2026-10-12.

What was the highest population aged 18 to 64 in Idaho County?

57.8% in 2010, the highest value since 2010 in this series.

Related statistics for Idaho County

All statistics for Idaho County | Idaho County in figures