Contra Costa County Demographics

A map of Contra Costa County's Population by Race

Contra Costa County, California had a population of 1,165,927 in 2020. It was 39.1% White, 8.4% Black, 18.4% Asian, 27.0% Hispanic, 1.4% Native American/Other, and 5.7% Multiracial. This map presents the population of Contra Costa County, with one dot drawn for each person counted in the 2020 Census, color-coded by race.

Contra Costa County is the 9th most populous county of the 58 counties in California.

Contra Costa County's White Population

455,421 residents of Contra Costa County identify as White, or 39.1%. This makes the White share of the population of Contra Costa County roughly similar to the White share of the population of California (34.7% White). Of the 58 counties in California, Contra Costa County is ranked #37 in terms of White residents as a share of the population.

Contra Costa County is more White than neighboring Alameda County (28.1% White), Solano County (34.2% White), San Mateo County (36.1% White), and San Joaquin County (27.7% White). Contra Costa County is less White than neighboring Napa County (49.9% White).

Contra Costa County's Black Population

97,994 residents of Contra Costa County identify as Black, or 8.4%. This makes the Black share of the population of Contra Costa County roughly similar to the Black share of the population of California (5.4% Black). Of the 58 counties in California, Contra Costa County is ranked #4 in terms of Black residents as a share of the population.

Contra Costa County is more Black than neighboring San Mateo County (1.9% Black), San Joaquin County (7.3% Black), and Napa County (1.7% Black). Contra Costa County is less Black than neighboring Alameda County (9.5% Black), and Solano County (13.2% Black).

Contra Costa County's Asian Population

214,520 residents of Contra Costa County identify as Asian, or 18.4%. This makes the Asian share of the population of Contra Costa County roughly similar to the Asian share of the population of California (15.1% Asian). Of the 58 counties in California, Contra Costa County is ranked #6 in terms of Asian residents as a share of the population.

Contra Costa County is more Asian than neighboring Solano County (15.6% Asian), San Joaquin County (17.3% Asian), and Napa County (7.6% Asian). Contra Costa County is less Asian than neighboring Alameda County (32.1% Asian), and San Mateo County (29.8% Asian).

Contra Costa County's Hispanic Population

314,900 residents of Contra Costa County identify as Hispanic, or 27.0%. This makes the Hispanic share of the population of Contra Costa County less than the Hispanic share of the population of California (39.4% Hispanic). Of the 58 counties in California, Contra Costa County is ranked #29 in terms of Hispanic residents as a share of the population.

Contra Costa County is more Hispanic than neighboring Alameda County (23.4% Hispanic), and San Mateo County (25% Hispanic). Contra Costa County is less Hispanic than neighboring Solano County (28.3% Hispanic), San Joaquin County (41.8% Hispanic), and Napa County (35.4% Hispanic).

Contra Costa County's Native American/Other Population

16,639 residents of Contra Costa County identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other, or 1.4%. This makes the Native American/Other share of the population of Contra Costa County roughly similar to the Native American/Other share of the population of California (1.3% Native American/Other). Of the 58 counties in California, Contra Costa County is ranked #35 in terms of Native American/Other residents as a share of the population.

Contra Costa County is more Native American/Other than neighboring Napa County (1.3% Native American/Other). Contra Costa County is less Native American/Other than neighboring Alameda County (1.7% Native American/Other), Solano County (1.8% Native American/Other), San Mateo County (2.1% Native American/Other), and San Joaquin County (1.6% Native American/Other).

Contra Costa County's Multiracial Population

66,453 residents of Contra Costa County identify as Multiracial, or 5.7%. This makes the Multiracial share of the population of Contra Costa County roughly similar to the Multiracial share of the population of California (4.1% Multiracial). Of the 58 counties in California, Contra Costa County is ranked #18 in terms of Multiracial residents as a share of the population.

Contra Costa County is more Multiracial than neighboring Alameda County (5.3% Multiracial), San Mateo County (5.1% Multiracial), San Joaquin County (4.4% Multiracial), and Napa County (4.2% Multiracial). Contra Costa County is less Multiracial than neighboring Solano County (6.8% Multiracial).

Source: 2020 Census State Redistricting Data and Census TIGER/Line Shapefiles.