Marin County Demographics

A map of Marin County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	167,816	173,149	65.1%	66.0%
Hispanic	50,216	49,410	19.5%	18.8%
Asian	15,705	16,175	6.1%	6.2%
Multiracial	15,135	14,415	5.9%	5.5%
Black	5,379	6,120	2.1%	2.3%
Native American/Other	3,718	3,052	1.4%	1.2%

Marin County, California has an estimated population of 257,969, a slight decrease from the 262,321 recorded in the 2020 Census. The population is 65.1% White, 19.5% Hispanic, 6.1% Asian, 5.9% Multiracial, 2.1% Black, and 1.4% Native American/Other. This demographic dot map shows the population of Marin County, with one dot drawn for each person counted by the Census, color-coded by race.

Marin has become slightly more 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 Marin County, that probability was 52.1% in 2020 and 53.1% in the most recent ACS estimates.

Marin County is ranked the 26th most populous county in California, out of 58 counties. Marin County was ranked the 26th most populous county in the 2020 Census.

Marin County's White Population

167,816 residents of Marin County, or 65.1% of the population, identify as White. The share of White residents in Marin County is significantly higher than in California overall, where 33.8% of the population is White. Marin County ranks 16th statewide in terms of White residents as a share of the population, out of 58 counties.

Since the 2020 Census, Marin County's White population has declined by an estimated 3.1%. White residents' share of Marin County's population has decreased from 66.0% to 65.1%.

Marin County is more White than neighboring San Francisco County (36.8% White), Sonoma County (57.9% White), Napa County (48.6% White), San Mateo County (34.7% White), and Contra Costa County (38.1% White).

Marin County's Black Population

5,379 residents of Marin County, or 2.1% of the population, identify as Black. The share of Black residents in Marin County is slightly lower than in California overall, where 5.2% of the population is Black. Marin County ranks 22nd statewide in terms of Black residents as a share of the population, out of 58 counties.

Since the 2020 Census, Marin County's Black population has declined by an estimated 12.1%. Black residents' share of Marin County's population has remained roughly unchanged at 2.1%.

Marin County is more Black than neighboring Sonoma County (1.5% Black), Napa County (1.7% Black), and San Mateo County (2% Black). Marin County is less Black than neighboring San Francisco County (4.7% Black), and Contra Costa County (7.9% Black).

Marin County's Asian Population

15,705 residents of Marin County, or 6.1% of the population, identify as Asian. The share of Asian residents in Marin County is lower than in California overall, where 15.3% of the population is Asian. Marin County ranks 23rd statewide in terms of Asian residents as a share of the population, out of 58 counties.

Since the 2020 Census, Marin County's Asian population has declined by an estimated 2.9%. Asian residents' share of Marin County's population has remained roughly unchanged at 6.1%.

Marin County is more Asian than neighboring Sonoma County (4.3% Asian). Marin County is less Asian than neighboring San Francisco County (34.9% Asian), Napa County (8.1% Asian), San Mateo County (31% Asian), and Contra Costa County (18.6% Asian).

Marin County's Hispanic Population

50,216 residents of Marin County, or 19.5% of the population, identify as Hispanic. The share of Hispanic residents in Marin County is significantly lower than in California overall, where 40.2% of the population is Hispanic. Marin County ranks 42nd statewide in terms of Hispanic residents as a share of the population, out of 58 counties.

Since the 2020 Census, Marin County's Hispanic population has grown by an estimated 1.6%. Hispanic residents' share of Marin County's population has increased from 18.8% to 19.5%.

Marin County is more Hispanic than neighboring San Francisco County (16.2% Hispanic). Marin County is less Hispanic than neighboring Sonoma County (30% Hispanic), Napa County (36.4% Hispanic), San Mateo County (24.9% Hispanic), and Contra Costa County (27.6% Hispanic).

Marin County's Native American/Other Population

3,718 residents of Marin County, or 1.4% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Marin County is comparable to the share in California overall, where 1.2% of the population is Native American/Other. Marin County ranks 49th statewide in terms of Native American/Other residents as a share of the population, out of 58 counties.

Since the 2020 Census, Marin County's Native American/Other population has grown by an estimated 21.8%. Native American/Other residents' share of Marin County's population has remained roughly unchanged at 1.4%.

Marin County is more Native American/Other than neighboring San Francisco County (1.3% Native American/Other), Sonoma County (1.3% Native American/Other), and Napa County (0.9% Native American/Other). Marin County is less Native American/Other than neighboring San Mateo County (2.1% Native American/Other).

Marin County's Multiracial Population

15,135 residents of Marin County, or 5.9% of the population, identify as Multiracial. The share of Multiracial residents in Marin County is comparable to the share in California overall, where 4.4% of the population is Multiracial. Marin County ranks 22nd statewide in terms of Multiracial residents as a share of the population, out of 58 counties.

Since the 2020 Census, Marin County's Multiracial population has grown by an estimated 5.0%. Multiracial residents' share of Marin County's population has remained roughly unchanged at 5.9%.

Marin County is more Multiracial than neighboring Sonoma County (5% Multiracial), Napa County (4.4% Multiracial), and San Mateo County (5.2% Multiracial). Marin County is less Multiracial than neighboring San Francisco County (6.1% Multiracial), and Contra Costa County (6.3% 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.