Demographics of Alameda County, California

Alameda County, California had 1,636,630 people on July 1, 2025, by the Census Bureau’s estimate: −43,859 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.

Alameda County, in four figures

1,636,630
Population: July 1, 2025, Vintage 2025 estimate.; −2.6%
Change since July 2020: −43,859 people.; 39.0 ±0.2
Median age: ACS 2020–⁠2024.; $129,367 ±$1,284
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.

Alameda County, California's population shrank 2.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Alameda County, California'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

Alameda County, California's population shrank 2.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Alameda County, California'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	1,680,489	100.0	100.0
2021	1,644,275	97.8	100.2
2022	1,633,138	97.2	100.7
2023	1,633,055	97.2	101.6
2024	1,636,624	97.4	102.5
2025	1,636,630	97.4	103.1

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Population of Alameda County, California on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	1,680,489	−1,757	+1,714	+160	−3,826
2021	1,644,275	−36,214	+5,125	+4,233	−43,102
2022	1,633,138	−11,137	+5,943	+15,793	−33,560
2023	1,633,055	−83	+5,717	+20,121	−26,253
2024	1,636,624	+3,569	+5,702	+19,919	−22,233
2025	1,636,630	+6	+5,593	+10,373	−15,960

Age, 2020–2024

The median age is 39.0 ±0.2: for men 38.4 ±0.1 and for women 39.7 ±0.1. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Alameda County by age, ACS 2020–2024
Age	People	Share	California	United States
Under 5	86,381 ±0	5.2% ±<0.1	5.5% ±<0.1	5.6% ±<0.1
5 to 17	239,895 ±1,948	14.5% ±0.1	16.5% ±<0.1	16.3% ±<0.1
18 to 24	130,760 ±2,066	7.9% ±0.1	9.1% ±<0.1	9.1% ±<0.1
25 to 44	518,262 ±2,726	31.4% ±0.2	28.7% ±<0.1	26.9% ±<0.1
45 to 64	420,014 ±2,651	25.5% ±0.2	24.6% ±<0.1	24.8% ±<0.1
65 and over	254,161 ±3,112	15.4% ±0.2	15.7% ±<0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $129,367 ±$1,284, and income per person $65,862 ±$642, in 2024 dollars. The median is $99,122 ±$310 in California and $80,734 ±$166 in the United States.

Households by income

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Households in Alameda County by income, ACS 2020–2024
Household income	Households	Share	California	United States
Under $25,000	65,345 ±2,227	10.9% ±0.4	12.5% ±0.1	14.6% ±<0.1
$25,000 to $49,999	58,933 ±2,009	9.9% ±0.3	13.3% ±0.1	16.7% ±<0.1
$50,000 to $74,999	58,553 ±1,823	9.8% ±0.3	13.0% ±0.1	15.5% ±<0.1
$75,000 to $99,999	56,169 ±2,061	9.4% ±0.3	11.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	96,171 ±2,146	16.1% ±0.4	17.8% ±0.1	17.5% ±<0.1
$150,000 to $199,999	70,712 ±2,141	11.8% ±0.4	11.3% ±0.1	9.6% ±<0.1
$200,000 or more	192,363 ±2,717	32.2% ±0.4	20.5% ±0.1	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 Alameda County by age, ACS 2020–2024
Age	Below poverty	Rate	California	United States
All ages	149,429 ±4,628	9.2% ±0.3	12.0% ±0.1	12.5% ±0.1
Under 18	28,457 ±1,660	8.8% ±0.5	15.0% ±0.1	16.1% ±0.1
18 to 59	83,859 ±2,934	8.8% ±0.3	11.0% ±0.1	11.6% ±0.1
60 and over	37,113 ±1,573	10.8% ±0.4	11.5% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in Alameda County, ACS 2020–2024
Measure	Alameda County	California	United States
Housing units	637,212 ±385	14,644,735 ±1,665	143,775,355 ±10,234
Occupied	93.9% ±0.3	92.5% ±0.1	89.9% ±0.1
Vacant	6.1% ±0.3	7.5% ±0.1	10.1% ±0.1
Owner occupied	54.4% ±0.5	55.9% ±0.3	65.2% ±0.3
Renter occupied	45.6% ±0.5	44.1% ±0.2	34.8% ±0.1
Median home value	$1,090,100 ±$6,313	$734,700 ±$1,307	$332,700 ±$236
Median gross rent	$2,357 ±$16	$2,036 ±$5	$1,413 ±$2
Median year built	1969 ±1	1976 ±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 Alameda County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	California	United States
Hispanic or Latino	386,114 ±0	23.4% ±<0.1	40.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	452,099 ±1,107	27.4% ±0.1	33.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	154,136 ±1,756	9.3% ±0.1	5.2% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	539,370 ±2,219	32.7% ±0.1	15.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	3,417 ±384	0.2% ±<0.1	0.3% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	11,533 ±605	0.7% ±<0.1	0.3% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	10,704 ±1,085	0.6% ±0.1	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	92,100 ±2,884	5.6% ±0.2	4.4% ±<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 Alameda County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	California	United States
Born in the state	789,733 ±5,989	47.9% ±0.4	56.5% ±0.1	57.3% ±<0.1
Born in another state	259,635 ±4,220	15.7% ±0.3	15.0% ±0.1	26.9% ±<0.1
Born a citizen outside the states	27,194 ±1,422	1.6% ±0.1	1.5% ±<0.1	1.7% ±<0.1
Born abroad	572,911 ±5,219	34.7% ±0.3	27.0% ±0.1	14.1% ±<0.1
Naturalized citizens	313,457 ±3,911	19.0% ±0.2	14.7% ±0.1	7.4% ±<0.1
Not citizens	259,454 ±5,232	15.7% ±0.3	12.3% ±0.1	6.8% ±<0.1

Alameda County among the counties of California

7th of 58 by population, July 2025. Every one is listed on the California page.

Counties of California near Alameda County in population, July 2025
County	July 2025	Change since 2020
San Diego County	3,282,248	−0.6%
Orange County	3,149,507	−1.2%
Riverside County	2,544,916	+5.0%
San Bernardino County	2,224,091	+1.9%
Santa Clara County	1,914,391	−0.9%
Alameda County	1,636,630	−2.6%
Sacramento County	1,618,460	+2.0%
Contra Costa County	1,170,070	+0.3%
Fresno County	1,035,456	+2.6%
Kern County	927,068	+2.3%
Ventura County	830,851	−1.5%

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