Data / Median age on 1 July (US county estimates) / Johnson County

Median age on 1 July (US county estimates) in Johnson County

Median age on 1 July (US county estimates) in Johnson County was 43 years in 2025, according to the U.S. Census Bureau. That is down 0.3 from 2024. That is the 54th highest of 102 counties in 2025.

2025, years43
Change on 2024-0.3
Rank54th of 102Counties in Illinois ranked
Series high43.42017
Series low42.32010

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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Median age on 1 July (US county estimates) in Johnson County, 2010 to 2025

42.342.542.84343.343.52010201320162019202220252010: 42.3 years2011: 42.3 years2012: 42.3 years2013: 42.6 years2014: 42.5 years2015: 42.7 years2016: 43.3 years2017: 43.4 years2018: 43.2 years2019: 43.2 years2020: 43 years2021: 42.9 years2022: 43 years2023: 43.1 years2024: 43.3 years2025: 43 years4242.54343.52010201620252010: 42.3 years2011: 42.3 years2012: 42.3 years2013: 42.6 years2014: 42.5 years2015: 42.7 years2016: 43.3 years2017: 43.4 years2018: 43.2 years2019: 43.2 years2020: 43 years2021: 42.9 years2022: 43 years2023: 43.1 years2024: 43.3 years2025: 43 years
years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12, published 2026-06-25.
All 16 values
Periodyears
202543
202443.3
202343.1
202243
202142.9
202043
201943.2
201843.2
201743.4
201643.3
201542.7
201442.5
201342.6
201242.3
201142.3
201042.3

Johnson County compared with nearby places

Adams County: 42.1 yearsAlexander County: 49.9 yearsBond County: 40.4 yearsBoone County: 40.7 yearsBrown County: 40.6 yearsBureau County: 45.1 yearsCalhoun County: 49.2 yearsCarroll County: 46.6 yearsCass County: 39.6 yearsChampaign County: 31 yearsChristian County: 43.9 yearsClark County: 43.7 yearsClay County: 43.1 yearsClinton County: 42 yearsColes County: 38.2 yearsCook County: 38.4 yearsCrawford County: 42.8 yearsCumberland County: 43.5 yearsDeKalb County: 34.1 yearsDe Witt County: 43.7 yearsDouglas County: 38.9 yearsDuPage County: 41 yearsEdgar County: 45.6 yearsEdwards County: 45.4 yearsEffingham County: 41.4 yearsFayette County: 41.2 yearsFord County: 42.1 yearsFranklin County: 43.9 yearsFulton County: 44.5 yearsGallatin County: 48.4 yearsGreene County: 44.1 yearsGrundy County: 39.7 yearsHamilton County: 43.2 yearsHancock County: 46.2 yearsHardin County: 50.6 yearsHenderson County: 51.2 yearsHenry County: 44 yearsIroquois County: 44.6 yearsJackson County: 33 yearsJasper County: 44 yearsJefferson County: 42.6 yearsJersey County: 44.9 yearsJo Daviess County: 51.3 yearsJohnson County: 43 yearsKane County: 39.5 yearsKankakee County: 40.3 yearsKendall County: 36.8 yearsKnox County: 43.2 yearsLake County: 40.2 yearsLaSalle County: 43.2 yearsLawrence County: 42.8 yearsLee County: 44.4 yearsLivingston County: 42.2 yearsLogan County: 41.9 yearsMcDonough County: 36.4 yearsMcHenry County: 41.6 yearsMcLean County: 35.5 yearsMacon County: 41.8 yearsMacoupin County: 45 yearsMadison County: 41.1 yearsMarion County: 43 yearsMarshall County: 45.6 yearsMason County: 46.2 yearsMassac County: 45.5 yearsMenard County: 44.6 yearsMercer County: 44.9 yearsMonroe County: 44.5 yearsMontgomery County: 43.6 yearsMorgan County: 42.3 yearsMoultrie County: 41.9 yearsOgle County: 42.4 yearsPeoria County: 38.7 yearsPerry County: 42.6 yearsPiatt County: 43.4 yearsPike County: 42.1 yearsPope County: 54.6 yearsPulaski County: 44.8 yearsPutnam County: 46.7 yearsRandolph County: 43.4 yearsRichland County: 43.6 yearsRock Island County: 40.6 yearsSt. Clair County: 40.5 yearsSaline County: 44 yearsSangamon County: 42 yearsSchuyler County: 49.7 yearsScott County: 46.6 yearsShelby County: 45.5 yearsStark County: 43.6 yearsStephenson County: 45.3 yearsTazewell County: 42.5 yearsUnion County: 44.8 yearsVermilion County: 41.6 yearsWabash County: 43.4 yearsWarren County: 41 yearsWashington County: 45.1 yearsWayne County: 42.6 yearsWhite County: 44.6 yearsWhiteside County: 43.7 yearsWill County: 40 yearsWilliamson County: 43.2 yearsWinnebago County: 40 yearsWoodford County: 42.3 years
  • Under 40
  • 40 to 42
  • 42 to 43
  • 43 to 44
  • 44 to 45
  • 45 and over
Median age on 1 July (US county estimates), 2025, years. Johnson 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

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

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How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Median age on 1 July (US county estimates), Johnson 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Median age on 1 July (US county estimates), Johnson 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/median-age-july-1-us-counties/johnson-county-illinois. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Median age on 1 July (US county estimates), Johnson 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/median-age-july-1-us-counties/johnson-county-illinois.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Median age on 1 July (US county estimates), Johnson County, 2010 to 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/en/median-age-july-1-us-counties/johnson-county-illinois (Accessed: 12 October 2026).

BibTeX
@misc{census_median_age_on_1_2025,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Median age on 1 July (US county estimates), Johnson 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/median-age-july-1-us-counties/johnson-county-illinois. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Median age on 1 July (US county estimates), Johnson 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/median-age-july-1-us-counties/johnson-county-illinois
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-age-july-1-us-counties/johnson-county-illinois.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Questions

What is the median age on 1 July (US county estimates) in Johnson County?

Median age on 1 July (US county estimates) in Johnson County was 43 years in 2025, according to the U.S. Census Bureau. That is down 0.3 from 2024. That is the 54th highest of 102 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved by Invokely on 2026-10-12.

What was the highest median age on 1 July (US county estimates) in Johnson County?

43.4 years in 2017, the highest value since 2010 in this series.

Related statistics for Johnson County

All statistics for Johnson County | Johnson County in figures