Altadena, CA Demographics

A map of Altadena's Population by Race

Altadena, California has an estimated population of 41,705, a slight decrease from the 42,846 recorded in the 2020 Census. The population is 41.3% White, 26.7% Hispanic, 16.9% Black, 8.0% Multiracial, 6.3% Asian, and 0.8% Native American/Other. This demographic dot map shows the population of Altadena, with one dot drawn for each person counted by the Census, color-coded by race.

Altadena has become slightly more racially diverse since the 2020 Census. It is 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 Altadena, that probability was 70.9% in 2020 and 71.9% in the most recent ACS estimates.

Altadena is ranked the 217th most populous place in California, out of 1,618 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Altadena was ranked the 214th most populous place in the 2020 Census.

Altadena's White Population

17,225 residents of Altadena, or 41.3% of the population, identify as White. The share of White residents in Altadena is higher than in California overall, where 33.8% of the population is White. Altadena ranks 1047th statewide in terms of White residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Altadena's White population has declined by an estimated 3.8%. White residents' share of Altadena's population has decreased from 41.8% to 41.3%.

Altadena is more White than neighboring Pasadena (34.9% White), San Marino (21.8% White), and East Pasadena (27.8% White). Altadena is less White than neighboring San Pasqual (43.4% White), and La Cañada Flintridge (53.9% White).

Altadena's Black Population

7,062 residents of Altadena, or 16.9% of the population, identify as Black. The share of Black residents in Altadena is considerably higher than in California overall, where 5.2% of the population is Black. Altadena ranks 25th statewide in terms of Black residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Altadena's Black population has declined by an estimated 1.0%. Black residents' share of Altadena's population has remained roughly unchanged at 16.9%.

Altadena is more Black than neighboring Pasadena (8% Black), San Pasqual (1.1% Black), La Cañada Flintridge (0.7% Black), San Marino (0.1% Black), and East Pasadena (3.3% Black).

Altadena's Asian Population

2,627 residents of Altadena, or 6.3% of the population, identify as Asian. The share of Asian residents in Altadena is lower than in California overall, where 15.3% of the population is Asian. Altadena ranks 393rd statewide in terms of Asian residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Altadena's Asian population has declined by an estimated 10.0%. Asian residents' share of Altadena's population has decreased from 6.8% to 6.3%.

Altadena is less Asian than neighboring Pasadena (17% Asian), San Pasqual (30.4% Asian), La Cañada Flintridge (30.8% Asian), San Marino (68.1% Asian), and East Pasadena (32% Asian).

Altadena's Hispanic Population

11,119 residents of Altadena, or 26.7% of the population, identify as Hispanic. The share of Hispanic residents in Altadena is considerably lower than in California overall, where 40.2% of the population is Hispanic. Altadena ranks 690th statewide in terms of Hispanic residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Altadena's Hispanic population has declined by an estimated 8.6%. Hispanic residents' share of Altadena's population has decreased from 28.4% to 26.7%.

Altadena is more Hispanic than neighboring San Pasqual (18.2% Hispanic), La Cañada Flintridge (7.7% Hispanic), and San Marino (5.3% Hispanic). Altadena is less Hispanic than neighboring Pasadena (34% Hispanic), and East Pasadena (34.1% Hispanic).

Altadena's Native American/Other Population

320 residents of Altadena, or 0.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Altadena is comparable to the share in California overall, where 1.2% of the population is Native American/Other. Altadena ranks 1117th statewide in terms of Native American/Other residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Altadena's Native American/Other population has declined by an estimated 17.1%. Native American/Other residents' share of Altadena's population has remained roughly unchanged at 0.8%.

Altadena is more Native American/Other than neighboring San Pasqual (0% Native American/Other), San Marino (0% Native American/Other), and East Pasadena (0.5% Native American/Other).

Altadena's Multiracial Population

3,352 residents of Altadena, or 8.0% of the population, identify as Multiracial. The share of Multiracial residents in Altadena is slightly higher than in California overall, where 4.4% of the population is Multiracial. Altadena ranks 614th statewide in terms of Multiracial residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Altadena's Multiracial population has grown by an estimated 43.6%. Multiracial residents' share of Altadena's population has increased from 5.4% to 8.0%.

Altadena is more Multiracial than neighboring Pasadena (5.4% Multiracial), San Pasqual (6.9% Multiracial), La Cañada Flintridge (6.1% Multiracial), San Marino (4.6% Multiracial), and East Pasadena (2.2% 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.