Average household size in Ada County

Average household size in Ada County was 2.5 persons per household in 2024, according to the U.S. Census Bureau. That is down 0.8% from 2023. That is the 30th highest of 44 counties in 2024.

2024, persons per household2.5

Change on 2023-0.8%

Rank30th of 44Counties in Idaho ranked

Series high2.62021

Series low2.52024

Next release: Friday, 29 January 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

Average household size in Ada County, 2021 to 2024

persons per household. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. Retrieved 2026-10-12, published 2026-01-29.

All 4 values

Period	persons per household
2024	2.5
2023	2.5
2022	2.5
2021	2.6

Compared with Idaho and United States

Place	2024
Ada County	2.5
Idaho	2.6
United States	2.5

Ada County compared with nearby places

Under 2.4
2.4 to 2.5
2.5 to 2.6
2.6 to 2.9
2.9 and over

Average household size, 2024, persons per household. Ada 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

EU countries by average household size 27 places
US states by average household size 51 places
Counties in Idaho by average household size 44 places

Definition

Average number of persons per private household. EU countries: EU-SILC. United States: American Community Survey five-year estimate of people in households divided by occupied housing units, where the period shown is the last year of the five-year span.

Covers private households only; people living in institutions or other group quarters are excluded. EU-SILC figures refer to the survey year. The EU and US surveys differ, so their figures are not strictly comparable.

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How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat. 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). American Community Survey 5-year estimates, table B25010: average household size of occupied housing units (Average household size, Ada County, 2021 to 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat

MLA 9

American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, Average household size, Ada County, 2021 to 2024. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat. Invokely, https://invokely.ai/en/average-household-size/ada-county-idaho. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. Average household size, Ada County, 2021 to 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat. Also distributed by Invokely, https://invokely.ai/en/average-household-size/ada-county-idaho.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, Average household size, Ada County, 2021 to 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat, via Invokely: https://invokely.ai/en/average-household-size/ada-county-idaho (Accessed: 12 October 2026).

BibTeX

@misc{census_average_household_size_ada_2024,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B25010: average household size of occupied housing units: Average household size, Ada County, 2021 to 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/average-household-size/ada-county-idaho. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. https://www2.census.gov/programs-surveys/acs/summary\_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B25010: average household size of occupied housing units: Average household size, Ada County, 2021 to 2024
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat
L2  - https://invokely.ai/en/average-household-size/ada-county-idaho
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/average-household-size/ada-county-idaho.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat. Retrieved 2026-10-12.
ER  -

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Questions

What is the average household size in Ada County?

Average household size in Ada County was 2.5 persons per household in 2024, according to the U.S. Census Bureau. That is down 0.8% from 2023. That is the 30th highest of 44 counties in 2024.

Where does this figure come from?

U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. Retrieved by Invokely on 2026-10-12.

What was the highest average household size in Ada County?

2.6 persons per household in 2021, the highest value since 2021 in this series.

Related statistics for Ada County

All statistics for Ada County | Ada County in figures