Alameda County Demographics

A map of Alameda County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
Asian	539,370	540,511	32.7%	32.1%
White	452,099	472,277	27.4%	28.1%
Hispanic	386,114	393,749	23.4%	23.4%
Black	154,136	159,499	9.3%	9.5%
Multiracial	92,100	88,537	5.6%	5.3%
Native American/Other	25,654	27,780	1.6%	1.7%

Alameda County, California has an estimated population of 1,649,473, a slight decrease from the 1,682,353 recorded in the 2020 Census. The population is 32.7% Asian, 27.4% White, 23.4% Hispanic, 9.3% Black, 5.6% Multiracial, and 1.6% Native American/Other. This demographic dot map shows the population of Alameda County, with one dot drawn for each person counted by the Census, color-coded by race.

Alameda is about as racially diverse as it was in the 2020 Census. It is considerably more diverse than California overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Alameda County, that probability was 75.1% in 2020 and 75.1% in the most recent ACS estimates.

Alameda County is ranked the 7th most populous county in California, out of 58 counties. Alameda County was ranked the 7th most populous county in the 2020 Census.

Alameda County's White Population

452,099 residents of Alameda County, or 27.4% of the population, identify as White. The share of White residents in Alameda County is lower than in California overall, where 33.8% of the population is White. Alameda County ranks 50th statewide in terms of White residents as a share of the population, out of 58 counties.

Since the 2020 Census, Alameda County's White population has declined by an estimated 4.3%. White residents' share of Alameda County's population has decreased from 28.1% to 27.4%.

Alameda County is more White than neighboring Santa Clara County (27.2% White). Alameda County is less White than neighboring Contra Costa County (38.1% White), San Mateo County (34.7% White), Solano County (33.2% White), and Santa Cruz County (53.9% White).

Alameda County's Black Population

154,136 residents of Alameda County, or 9.3% of the population, identify as Black. The share of Black residents in Alameda County is slightly higher than in California overall, where 5.2% of the population is Black. Alameda County ranks 2nd statewide in terms of Black residents as a share of the population, out of 58 counties.

Since the 2020 Census, Alameda County's Black population has declined by an estimated 3.4%. Black residents' share of Alameda County's population has remained roughly unchanged at 9.3%.

Alameda County is more Black than neighboring Contra Costa County (7.9% Black), Santa Clara County (2.2% Black), San Mateo County (2% Black), and Santa Cruz County (0.7% Black). Alameda County is less Black than neighboring Solano County (12.3% Black).

Alameda County's Asian Population

539,370 residents of Alameda County, or 32.7% of the population, identify as Asian. The share of Asian residents in Alameda County is significantly higher than in California overall, where 15.3% of the population is Asian. Alameda County ranks 3rd statewide in terms of Asian residents as a share of the population, out of 58 counties.

Since the 2020 Census, Alameda County's Asian population has remained roughly the same. Asian residents' share of Alameda County's population has increased from 32.1% to 32.7%.

Alameda County is more Asian than neighboring Contra Costa County (18.6% Asian), San Mateo County (31% Asian), Solano County (15.9% Asian), and Santa Cruz County (4.7% Asian). Alameda County is less Asian than neighboring Santa Clara County (40.3% Asian).

Alameda County's Hispanic Population

386,114 residents of Alameda County, or 23.4% of the population, identify as Hispanic. The share of Hispanic residents in Alameda County is significantly lower than in California overall, where 40.2% of the population is Hispanic. Alameda County ranks 36th statewide in terms of Hispanic residents as a share of the population, out of 58 counties.

Since the 2020 Census, Alameda County's Hispanic population has declined by an estimated 1.9%. Hispanic residents' share of Alameda County's population has remained roughly unchanged at 23.4%.

Alameda County is less Hispanic than neighboring Contra Costa County (27.6% Hispanic), Santa Clara County (25% Hispanic), San Mateo County (24.9% Hispanic), Solano County (29.6% Hispanic), and Santa Cruz County (35.2% Hispanic).

Alameda County's Native American/Other Population

25,654 residents of Alameda County, or 1.6% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Alameda County is comparable to the share in California overall, where 1.2% of the population is Native American/Other. Alameda County ranks 29th statewide in terms of Native American/Other residents as a share of the population, out of 58 counties.

Since the 2020 Census, Alameda County's Native American/Other population has declined by an estimated 7.7%. Native American/Other residents' share of Alameda County's population has remained roughly unchanged at 1.6%.

Alameda County is more Native American/Other than neighboring Contra Costa County (1.4% Native American/Other), Santa Clara County (1.1% Native American/Other), and Santa Cruz County (1% Native American/Other). Alameda County is less Native American/Other than neighboring San Mateo County (2.1% Native American/Other), and Solano County (2% Native American/Other).

Alameda County's Multiracial Population

92,100 residents of Alameda County, or 5.6% of the population, identify as Multiracial. The share of Multiracial residents in Alameda County is comparable to the share in California overall, where 4.4% of the population is Multiracial. Alameda County ranks 25th statewide in terms of Multiracial residents as a share of the population, out of 58 counties.

Since the 2020 Census, Alameda County's Multiracial population has grown by an estimated 4.0%. Multiracial residents' share of Alameda County's population has remained roughly unchanged at 5.6%.

Alameda County is more Multiracial than neighboring Santa Clara County (4.2% Multiracial), San Mateo County (5.2% Multiracial), and Santa Cruz County (4.5% Multiracial). Alameda County is less Multiracial than neighboring Contra Costa County (6.3% Multiracial), and Solano County (6.9% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.