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

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

Median age on 1 July (US county estimates) in Flathead County was 42.5 years in 2025, according to the U.S. Census Bureau. That is up 0.1 from 2024. That is the 37th highest of 56 counties in 2025.

2025, years42.5
Change on 2024+0.1
Rank37th of 56Counties in Montana ranked
Series high42.82020
Series low41.32010

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

Get an email when a new figure is out or this one is revised.
Keep it in a collection in your library.

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

4141.54242.5432010201320162019202220252010: 41.3 years2011: 41.8 years2012: 42.2 years2013: 42.4 years2014: 42.6 years2015: 42.6 years2016: 42.4 years2017: 42.5 years2018: 42.5 years2019: 42.7 years2020: 42.8 years2021: 42.5 years2022: 42.3 years2023: 42.3 years2024: 42.4 years2025: 42.5 years4141.54242.5432010201620252010: 41.3 years2011: 41.8 years2012: 42.2 years2013: 42.4 years2014: 42.6 years2015: 42.6 years2016: 42.4 years2017: 42.5 years2018: 42.5 years2019: 42.7 years2020: 42.8 years2021: 42.5 years2022: 42.3 years2023: 42.3 years2024: 42.4 years2025: 42.5 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
202542.5
202442.4
202342.3
202242.3
202142.5
202042.8
201942.7
201842.5
201742.5
201642.4
201542.6
201442.6
201342.4
201242.2
201141.8
201041.3

Flathead County compared with nearby places

Beaverhead County: 43.3 yearsBig Horn County: 32.8 yearsBlaine County: 36.7 yearsBroadwater County: 43.7 yearsCarbon County: 50.5 yearsCarter County: 44.7 yearsCascade County: 39.1 yearsChouteau County: 44.2 yearsCuster County: 42 yearsDaniels County: 45.7 yearsDawson County: 42 yearsDeer Lodge County: 51.1 yearsFallon County: 40.8 yearsFergus County: 45.7 yearsFlathead County: 42.5 yearsGallatin County: 34.8 yearsGarfield County: 44.2 yearsGlacier County: 34.9 yearsGolden Valley County: 49.5 yearsGranite County: 51.5 yearsHill County: 35.8 yearsJefferson County: 47.2 yearsJudith Basin County: 50.9 yearsLake County: 45.3 yearsLewis and Clark County: 42.4 yearsLiberty County: 42.1 yearsLincoln County: 52.4 yearsMcCone County: 47.3 yearsMadison County: 49.7 yearsMeagher County: 50.4 yearsMineral County: 51.3 yearsMissoula County: 38.8 yearsMusselshell County: 48 yearsPark County: 46 yearsPetroleum County: 56.7 yearsPhillips County: 44.3 yearsPondera County: 42.2 yearsPowder River County: 49.5 yearsPowell County: 45.7 yearsPrairie County: 54.6 yearsRavalli County: 49.2 yearsRichland County: 39.6 yearsRoosevelt County: 32.9 yearsRosebud County: 37.5 yearsSanders County: 54.9 yearsSheridan County: 46.3 yearsSilver Bow County: 41.9 yearsStillwater County: 48.1 yearsSweet Grass County: 49.9 yearsTeton County: 43.5 yearsToole County: 39.3 yearsTreasure County: 46 yearsValley County: 44.7 yearsWheatland County: 47.5 yearsWibaux County: 46.4 yearsYellowstone County: 39.7 years
  • Under 39
  • 39 to 42
  • 42 to 45
  • 45 to 47
  • 47 to 50
  • 50 and over
Median age on 1 July (US county estimates), 2025, years. Flathead 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.

Report a problem with this figure

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), Flathead 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), Flathead 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/flathead-county-montana. 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), Flathead 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/flathead-county-montana.

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), Flathead 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/flathead-county-montana (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), Flathead 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/flathead-county-montana. 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), Flathead 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/flathead-county-montana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-age-july-1-us-counties/flathead-county-montana.
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  -
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:

What is the latest median age on 1 July (US county estimates) in Flathead County? Cite the source.
get_value {"indicator":"median_age_pep","place":"us-county-30029"}
GET https://invokely.ai/api/v1/value?indicator=median_age_pep&place=us-county-30029

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

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

Median age on 1 July (US county estimates) in Flathead County was 42.5 years in 2025, according to the U.S. Census Bureau. That is up 0.1 from 2024. That is the 37th highest of 56 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 Flathead County?

42.8 years in 2020, the highest value since 2010 in this series.

Related statistics for Flathead County

All statistics for Flathead County | Flathead County in figures