Demographics of Ada County, Idaho

Ada County, Idaho had 546,141 people on July 1, 2025, by the Census Bureau’s estimate: +47,878 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Ada County, in four figures

546,141
Population: July 1, 2025, Vintage 2025 estimate.; +9.6%
Change since July 2020: +47,878 people.; 38.4 ±0.2
Median age: ACS 2020–⁠2024.; $91,502 ±$1,355
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Ada County, Idaho's population grew 9.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Ada County, Idaho's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Ada County, Idaho's population grew 9.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Ada County, Idaho's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	498,263	100.0	100.0
2021	513,092	103.0	100.2
2022	520,365	104.4	100.7
2023	526,352	105.6	101.6
2024	535,225	107.4	102.5
2025	546,141	109.6	103.1

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Population of Ada County, Idaho on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	498,263	+3,297	+351	+16	+3,135
2021	513,092	+14,829	+1,002	+175	+14,277
2022	520,365	+7,273	+742	+1,711	+4,831
2023	526,352	+5,987	+1,166	+1,994	+2,820
2024	535,225	+8,873	+1,370	+2,284	+5,109
2025	546,141	+10,916	+1,629	+779	+8,528

Age, 2020–2024

The median age is 38.4 ±0.2: for men 37.6 ±0.2 and for women 39.4 ±0.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Ada County by age, ACS 2020–2024
Age	People	Share	Idaho	United States
Under 5	26,383 ±42	5.1% ±<0.1	5.9% ±<0.1	5.6% ±<0.1
5 to 17	87,810 ±1,596	16.9% ±0.3	18.2% ±0.2	16.3% ±<0.1
18 to 24	45,881 ±1,286	8.8% ±0.2	9.8% ±0.1	9.1% ±<0.1
25 to 44	146,974 ±1,677	28.3% ±0.3	26.1% ±0.2	26.9% ±<0.1
45 to 64	127,617 ±1,593	24.6% ±0.3	23.0% ±0.2	24.8% ±<0.1
65 and over	84,270 ±1,893	16.2% ±0.4	17.0% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $91,502 ±$1,355, and income per person $49,757 ±$1,078, in 2024 dollars. The median is $77,800 ±$743 in Idaho and $80,734 ±$166 in the United States.

Households by income

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Households in Ada County by income, ACS 2020–2024
Household income	Households	Share	Idaho	United States
Under $25,000	19,866 ±1,168	9.8% ±0.6	12.5% ±0.3	14.6% ±<0.1
$25,000 to $49,999	27,593 ±1,428	13.6% ±0.7	17.6% ±0.4	16.7% ±<0.1
$50,000 to $74,999	32,828 ±1,664	16.2% ±0.8	18.1% ±0.4	15.5% ±<0.1
$75,000 to $99,999	30,238 ±1,601	14.9% ±0.8	14.7% ±0.4	12.6% ±<0.1
$100,000 to $149,999	40,929 ±1,751	20.2% ±0.9	19.3% ±0.4	17.5% ±<0.1
$150,000 to $199,999	21,921 ±1,261	10.8% ±0.6	8.7% ±0.3	9.6% ±<0.1
$200,000 or more	29,168 ±1,522	14.4% ±0.7	9.2% ±0.3	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Ada County by age, ACS 2020–2024
Age	Below poverty	Rate	Idaho	United States
All ages	42,159 ±2,900	8.3% ±0.6	10.6% ±0.3	12.5% ±0.1
Under 18	9,599 ±1,049	8.5% ±0.9	12.4% ±0.5	16.1% ±0.1
18 to 59	23,643 ±1,699	8.4% ±0.6	10.4% ±0.3	11.6% ±0.1
60 and over	8,917 ±923	8.0% ±0.8	9.1% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Ada County, ACS 2020–2024
Measure	Ada County	Idaho	United States
Housing units	211,440 ±130	795,014 ±223	143,775,355 ±10,234
Occupied	95.8% ±0.4	89.7% ±0.3	89.9% ±0.1
Vacant	4.2% ±0.4	10.3% ±0.3	10.1% ±0.1
Owner occupied	70.8% ±0.7	72.1% ±0.4	65.2% ±0.3
Renter occupied	29.2% ±0.8	27.9% ±0.4	34.8% ±0.1
Median home value	$512,300 ±$8,186	$418,600 ±$2,550	$332,700 ±$236
Median gross rent	$1,577 ±$32	$1,238 ±$16	$1,413 ±$2
Median year built	1997 ±1	1991 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Ada County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Idaho	United States
Hispanic or Latino	50,948 ±0	9.8% ±<0.1	13.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	419,728 ±1,330	80.9% ±0.3	78.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	6,536 ±499	1.3% ±0.1	0.7% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	14,215 ±751	2.7% ±0.1	1.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	1,316 ±213	0.3% ±<0.1	0.7% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	935 ±149	0.2% ±<0.1	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	2,751 ±548	0.5% ±0.1	0.6% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	22,506 ±1,566	4.3% ±0.3	4.2% ±0.1	4.3% ±<0.1

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Ada County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Idaho	United States
Born in the state	201,104 ±3,468	38.8% ±0.7	43.9% ±0.3	57.3% ±<0.1
Born in another state	278,783 ±3,712	53.7% ±0.7	49.1% ±0.3	26.9% ±<0.1
Born a citizen outside the states	6,933 ±738	1.3% ±0.1	1.0% ±0.1	1.7% ±<0.1
Born abroad	32,115 ±1,573	6.2% ±0.3	5.9% ±0.2	14.1% ±<0.1
Naturalized citizens	17,366 ±1,316	3.3% ±0.3	2.7% ±0.1	7.4% ±<0.1
Not citizens	14,749 ±1,304	2.8% ±0.3	3.2% ±0.2	6.8% ±<0.1

Ada County among the counties of Idaho

1st of 44 by population, July 2025. Every one is listed on the Idaho page.

Counties of Idaho near Ada County in population, July 2025
County	July 2025	Change since 2020
Ada County	546,141	+9.6%
Canyon County	275,123	+18.1%
Kootenai County	191,864	+11.0%
Bonneville County	135,771	+8.9%
Twin Falls County	97,539	+7.9%
Bannock County	91,591	+4.9%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026