Data / Population under 18 / Jefferson County

Population under 18 in Jefferson County

Population under 18 in Jefferson County was 21.7% in 2025, according to the U.S. Census Bureau. That is down 0.1 pts from 2024. That is the 24th highest of 67 counties in 2025.

202521.7%
Change on 2024-0.1 pts
Rank24th of 67Counties in Alabama ranked
Series high23.42010
Series low21.72025

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 under 18 in Jefferson County, 2010 to 2025

21.52222.52323.52010201320162019202220252010: 23.4 %2011: 23.3 %2012: 23.1 %2013: 22.9 %2014: 22.8 %2015: 22.7 %2016: 22.5 %2017: 22.3 %2018: 22.1 %2019: 22 %2020: 22.1 %2021: 22 %2022: 21.9 %2023: 21.9 %2024: 21.9 %2025: 21.7 %21.52222.52323.52010201620252010: 23.4 %2011: 23.3 %2012: 23.1 %2013: 22.9 %2014: 22.8 %2015: 22.7 %2016: 22.5 %2017: 22.3 %2018: 22.1 %2019: 22 %2020: 22.1 %2021: 22 %2022: 21.9 %2023: 21.9 %2024: 21.9 %2025: 21.7 %
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12, published 2026-06-25.
All 16 values
Period%
202521.7
202421.9
202321.9
202221.9
202122
202022.1
201922
201822.1
201722.3
201622.5
201522.7
201422.8
201322.9
201223.1
201123.3
201023.4

Compared with Alabama and United States

Place2025
Jefferson County21.7
Alabama21.5
United States21.1

Jefferson County compared with nearby places

Autauga County: 23.3 %Baldwin County: 20.4 %Barbour County: 19.3 %Bibb County: 20.6 %Blount County: 22.6 %Bullock County: 18.9 %Butler County: 20.9 %Calhoun County: 20.8 %Chambers County: 20.5 %Cherokee County: 18.3 %Chilton County: 23.4 %Choctaw County: 18.7 %Clarke County: 21.3 %Clay County: 20.4 %Cleburne County: 22.8 %Coffee County: 23.5 %Colbert County: 21.6 %Conecuh County: 19.5 %Coosa County: 16.2 %Covington County: 22.3 %Crenshaw County: 22.7 %Cullman County: 21.9 %Dale County: 22.6 %Dallas County: 22.1 %DeKalb County: 23.5 %Elmore County: 20.6 %Escambia County: 22.2 %Etowah County: 21.7 %Fayette County: 21.3 %Franklin County: 25.3 %Geneva County: 21.2 %Greene County: 21.1 %Hale County: 23.8 %Henry County: 20.3 %Houston County: 22.3 %Jackson County: 20.9 %Jefferson County: 21.7 %Lamar County: 21.4 %Lauderdale County: 19 %Lawrence County: 21.5 %Lee County: 20.1 %Limestone County: 22.2 %Lowndes County: 19.9 %Macon County: 15.8 %Madison County: 21 %Marengo County: 21.4 %Marion County: 20.8 %Marshall County: 25.6 %Mobile County: 22.6 %Monroe County: 20.9 %Montgomery County: 22.9 %Morgan County: 22.5 %Perry County: 20.6 %Pickens County: 19.4 %Pike County: 19.3 %Randolph County: 21.2 %Russell County: 23.7 %St. Clair County: 21.9 %Shelby County: 21.6 %Sumter County: 19.1 %Talladega County: 20.2 %Tallapoosa County: 19.2 %Tuscaloosa County: 19.4 %Walker County: 22.5 %Washington County: 21.2 %Wilcox County: 20.5 %Winston County: 20.6 %
  • Under 19
  • 19 to 21
  • 21 to 22
  • 22 to 23
  • 23 and over
Population under 18, 2025, %. Jefferson 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 0 to 17 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.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

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How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 0 to 17 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 under 18, Jefferson 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 0 to 17 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 under 18, Jefferson 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-under-18/jefferson-county-alabama. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, Jefferson 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-under-18/jefferson-county-alabama.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, Jefferson 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-under-18/jefferson-county-alabama (Accessed: 12 October 2026).

BibTeX
@misc{census_population_under_18_jefferson_2025,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, Jefferson 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-under-18/jefferson-county-alabama. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 0 to 17 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 under 18, Jefferson 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-under-18/jefferson-county-alabama
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/population-under-18/jefferson-county-alabama.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18 in Jefferson County?

Population under 18 in Jefferson County was 21.7% in 2025, according to the U.S. Census Bureau. That is down 0.1 pts from 2024. That is the 24th highest of 67 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18 in Jefferson County?

23.4% in 2010, the highest value since 2010 in this series.

Related statistics for Jefferson County

All statistics for Jefferson County | Jefferson County in figures