Alto, CA Demographics

A map of Alto's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	825	571	80.6%	78.0%
Hispanic	126	57	12.3%	7.8%
Asian	58	31	5.7%	4.2%
Black	15	2	1.5%	0.3%
Native American/Other	0	14	0.0%	1.9%
Multiracial	0	57	0.0%	7.8%

Alto, California has an estimated population of 1,024, a dramatic increase from the 732 recorded in the 2020 Census. The population is 80.6% White, 12.3% Hispanic, 5.7% Asian, 1.5% Black, 0.0% Native American/Other, and 0.0% Multiracial. This demographic dot map shows the population of Alto, with one dot drawn for each person counted by the Census, color-coded by race.

Alto has become less racially diverse since the 2020 Census. It is considerably less 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 Alto, that probability was 37.7% in 2020 and 33.2% in the most recent ACS estimates.

Alto is ranked the 1058th 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). Alto was ranked the 1144th most populous place in the 2020 Census.

Alto's White Population

825 residents of Alto, or 80.6% of the population, identify as White. The share of White residents in Alto is significantly higher than in California overall, where 33.8% of the population is White. Alto ranks 302nd statewide in terms of White residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Alto's White population has grown by an estimated 44.5%. White residents' share of Alto's population has increased from 78.0% to 80.6%.

Alto is more White than neighboring Strawberry CDP (Marin County) (66.7% White), Corte Madera (70.2% White), Mill Valley (80.1% White), Tamalpais-Homestead Valley (76.2% White), and Marin City (26.4% White).

Alto's Black Population

15 residents of Alto, or 1.5% of the population, identify as Black. The share of Black residents in Alto is slightly lower than in California overall, where 5.2% of the population is Black. Alto ranks 1237th statewide in terms of Black residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Alto's Black population has grown by an estimated 650.0%. Black residents' share of Alto's population has increased from 0.3% to 1.5%.

Alto is more Black than neighboring Strawberry CDP (Marin County) (0.8% Black), Mill Valley (0.7% Black), and Tamalpais-Homestead Valley (1.3% Black). Alto is less Black than neighboring Marin City (31.1% Black).

Alto's Asian Population

58 residents of Alto, or 5.7% of the population, identify as Asian. The share of Asian residents in Alto is lower than in California overall, where 15.3% of the population is Asian. Alto ranks 535th statewide in terms of Asian residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Alto's Asian population has grown by an estimated 87.1%. Asian residents' share of Alto's population has increased from 4.2% to 5.7%.

Alto is less Asian than neighboring Strawberry CDP (Marin County) (5.9% Asian), Corte Madera (6.8% Asian), Mill Valley (8.3% Asian), Tamalpais-Homestead Valley (7.1% Asian), and Marin City (19.4% Asian).

Alto's Hispanic Population

126 residents of Alto, or 12.3% of the population, identify as Hispanic. The share of Hispanic residents in Alto is significantly lower than in California overall, where 40.2% of the population is Hispanic. Alto ranks 1393rd statewide in terms of Hispanic residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Alto's Hispanic population has grown by an estimated 121.1%. Hispanic residents' share of Alto's population has increased from 7.8% to 12.3%.

Alto is more Hispanic than neighboring Corte Madera (12.1% Hispanic), Mill Valley (4.8% Hispanic), and Tamalpais-Homestead Valley (7.6% Hispanic). Alto is less Hispanic than neighboring Strawberry CDP (Marin County) (16.8% Hispanic), and Marin City (15% Hispanic).

Alto's Native American/Other Population

0 residents of Alto, or 0.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Alto is comparable to the share in California overall, where 1.2% of the population is Native American/Other. Alto ranks 441st statewide in terms of Native American/Other residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Alto's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of Alto's population has decreased from 1.9% to 0.0%.

Alto is less Native American/Other than neighboring Strawberry CDP (Marin County) (4.6% Native American/Other), Corte Madera (2.3% Native American/Other), Mill Valley (1.2% Native American/Other), Tamalpais-Homestead Valley (1.2% Native American/Other), and Marin City (0.4% Native American/Other).

Alto's Multiracial Population

0 residents of Alto, or 0.0% of the population, identify as Multiracial. The share of Multiracial residents in Alto is slightly lower than in California overall, where 4.4% of the population is Multiracial. Alto ranks 150th statewide in terms of Multiracial residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Alto's Multiracial population has declined by an estimated 100.0%. Multiracial residents' share of Alto's population has decreased from 7.8% to 0.0%.

Alto is less Multiracial than neighboring Strawberry CDP (Marin County) (5.2% Multiracial), Corte Madera (7% Multiracial), Mill Valley (4.9% Multiracial), Tamalpais-Homestead Valley (6.7% Multiracial), and Marin City (7.6% 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.