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Understand Idaho

Idaho median age

37.8 years

Median age of Idaho residents, 2024 (estimate)

0.0% since 2023 (37.8 years); +2.4% since 2019 (36.9 years); +5.3% since 2014 (35.9 years)

Source: U.S. Census Bureau, American Community Survey, 1-Year Estimates. Data period 2024. Status: estimate. Published September 11, 2025. Retrieved September 8, 2026.

What the number tells us

Median age of Idaho residents: 37.8 years in 2024 (an estimate). Median age of the total population (B01002_001E).

Among 51 states and the District of Columbia, Idaho ranked 44th highest in 2024. Maine was highest at 44.9 years and Utah lowest at 32.5 years.

Among 44 Idaho counties in 2020–2024, Custer County was highest at 60 years and Madison County lowest at 21.4 years.

The United States figure for 2024 was 39.2 years.

Historical data

Idaho median age, 2010 to 2024Idaho median age, 2010 to 2024. Idaho: 34.7 in 2010, 37.8 in 2024.010203040201020152020IdahoYears

Source: U.S. Census Bureau, American Community Survey, 1-Year Estimates. Published September 11, 2025. Retrieved September 8, 2026.

Data table (14 rows)
PeriodIdaho (years)
201034.7
201135
201235.2
201335.7
201435.9
201535.8
201636.1
201736.3
201836.8
201936.9
202137.3
202237.5
202337.8
202437.8

By county

44 of 44 counties have a value for 2020–2024. Idaho statewide on the same basis: 37.3 years. Median age of the total population (B01002_001E).

Idaho median age by county, 2020–2024Idaho median age by county, 2020–2024. 44 bars, from Custer (60) to Madison (21.4).Custer60Adams53.9Boise53.4Lemhi53.3Clearwater52.2Idaho49.4Lewis49Bonner48.1Valley46.9Blaine45.6Benewah45.5Washington45Shoshone44.8Gem44.2Boundary43.7Butte41.3Nez Perce41.2Kootenai40.9Oneida40.8Bear Lake40.5Fremont40Teton39.6Owyhee39Payette38.9Caribou38.5Ada38.4Gooding38.1Lincoln37.2Camas36.8Twin Falls36.1Bannock35.2Bingham35Canyon34.9Minidoka34.9Power34.6Jerome34Bonneville33.6Franklin33.3Cassia33.2Elmore33.1Jefferson32.8Clark31.1Latah30.6Madison21.4

Source: U.S. Census Bureau, American Community Survey, 5-Year Estimates. Data period 2020-2024. Published January 29, 2026. Retrieved September 8, 2026.

Data table (44 rows)
County2020–2024
Custer County60
Adams County53.9
Boise County53.4
Lemhi County53.3
Clearwater County52.2
Idaho County49.4
Lewis County49
Bonner County48.1
Valley County46.9
Blaine County45.6
Benewah County45.5
Washington County45
Shoshone County44.8
Gem County44.2
Boundary County43.7
Butte County41.3
Nez Perce County41.2
Kootenai County40.9
Oneida County40.8
Bear Lake County40.5
Fremont County40
Teton County39.6
Owyhee County39
Payette County38.9
Caribou County38.5
Ada County38.4
Gooding County38.1
Lincoln County37.2
Camas County36.8
Twin Falls County36.1
Bannock County35.2
Bingham County35
Canyon County34.9
Minidoka County34.9
Power County34.6
Jerome County34
Bonneville County33.6
Franklin County33.3
Cassia County33.2
Elmore County33.1
Jefferson County32.8
Clark County31.1
Latah County30.6
Madison County21.4

Compared with other states

Idaho, its six neighboring states, the United States, and the three highest and lowest states in 2024. The table lists all 52.

Idaho median age compared with other states, 2024Idaho median age compared with other states, 2024. 13 bars, from Maine (44.9) to Utah (32.5).Maine44.9Vermont43.9New Hampshire43.6Montana41.3Oregon40.8Wyoming40.2Nevada39.5United States39.2Washington38.7Idaho37.8Texas35.9District of Columbia34.9Utah32.5

Source: U.S. Census Bureau, American Community Survey, 1-Year Estimates. Data period 2024. Published September 11, 2025. Retrieved September 8, 2026.

Data table (52 rows)
State2024
1. Maine44.9
2. Vermont43.9
3. New Hampshire43.6
4. West Virginia42.9
5. Florida42.7
6. Delaware42.1
7. Hawaii41.5
8. Montana41.3
9. Connecticut41.2
10. Pennsylvania41.2
11. Rhode Island41
12. Oregon40.8
13. South Carolina40.7
14. Wisconsin40.7
15. Michigan40.4
16. Wyoming40.2
17. Massachusetts40.1
18. New Jersey40.1
19. New York40.1
20. New Mexico39.9
21. Maryland39.8
22. Ohio39.8
23. Alabama39.6
24. Nevada39.5
25. Arizona39.4
26. Illinois39.4
27. Missouri39.4
28. North Carolina39.4
29. Virginia39.4
30. Kentucky39.3
31. Mississippi39.3
32. Minnesota39.2
33. United States39.2
34. Arkansas39.1
35. Tennessee39.1
36. Iowa39
37. Louisiana38.7
38. South Dakota38.7
39. Washington38.7
40. California38.4
41. Indiana38.3
42. Colorado38
43. Georgia38
44. Kansas38
45. Idaho37.8
46. Nebraska37.4
47. Oklahoma37.4
48. North Dakota36.7
49. Alaska36.3
50. Texas35.9
51. District of Columbia34.9
52. Utah32.5

Source

Organization
U.S. Census Bureau
Dataset
American Community Survey, 1-Year Estimates
Geography
Nation and states, including the District of Columbia
Time coverage
2010-2019, 2021-2024
Update frequency
Annual
Published
September 11, 2025
Retrieved
September 8, 2026
Original file
https://api.census.gov/data/{year}/acs/acs1?get=NAME,{variables}&for=state:*|us:*&key=... (2021-2024 instead pulled from https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/1YRData/, see caveats)
Methodology
https://www.census.gov/programs-surveys/acs/methodology.html
License
Public domain. U.S. federal government work.
Our copy
census-acs1, built by scripts/fetch-census-acs.py

Caveats

  • All values are single-year survey estimates and carry margins of error not stored here; small states and small differences between years can be within the margin of error.
  • Dollar figures (economy.median_household_income, housing.median_home_value, housing.median_gross_rent) are in that survey year's dollars and are not adjusted for inflation across years.
  • 1-year estimates are not comparable to 5-year estimates (see census-acs5) for the same geography or metric: different reference periods produce different figures even when nothing changed.
  • There is no standard 2020 ACS 1-year release; the Census Bureau replaced it with experimental estimates because of COVID-19 data collection disruption, and 2020 is omitted here rather than substituted.
  • 2010-2019 were pulled from the Census Data API (api.census.gov), which requires an API key; 2021-2024 were pulled from Census's keyless bulk table-based Summary File (www2.census.gov), which only exists in that convenient one-file-per-table layout from 2021 onward and was already on hand. For 2023 both sources were fetched and every value compared; they agreed exactly.
  • economy.poverty_rate and economy.uninsured_rate are derived from detailed tables B17001 and B27001 rather than the Census subject tables S1701/S2701, because the subject tables' column numbering for these percentages has changed across vintages (confirmed: S2701's 'percent uninsured' column moves from C03 to C05 between 2014 and 2015, and the table does not exist before 2013), while the detailed-table variable numbers used here are stable back to at least 2010.
  • All rate and share metrics (percent unit) are rounded to one decimal place by this puller; level metrics are stored exactly as published.

Data

Download the full dataset behind this page as CSV or JSON, or browse the data catalog. Cite this page as Understand Idaho, “Idaho median age”, https://understandidaho.com/population/age/, retrieved on the date you read it.