Contra Costa County, CA Demographics

The total population of Contra Costa County is estimated to be 1.16 million with 573,074 males (49.29%) and 589,574 females (50.71%). There are 16,500 more females than males in Contra Costa County.
The median household income in Contra Costa County was $119,392 in 2021, which marked an an increase of 1,549(1.31%) from $117,843 in 2020. This income is 160.03% of the U.S. median household income of $74,606 (all incomes in 2022 inflation-adjusted dollars).
Per the latest American Community Survey by the Census Bureau, Contra Costa County sees its highest median household income among householders in the age group of 45 to 64 years old, at $145,936. Overall, the median household income for the county of Contra Costa County stands at $120,061.
In Contra Costa County, the median income for all workers aged 15 years and older, regardless of work hours, was $62,650 for males and $41,568 for females. However, when specifically considering full-time, year-round workers within the same age group, the median income was $90,998 for males and $78,934 for females.
In Contra Costa County, the demographic landscape is diverse, spanning 7 distinct racial categories among households. Among these, Asian households have the highest median household income at $160,862, while Black or African American households represent the opposite end with the lowest median household income of $77,202.
In 2022, the population of Contra Costa County was 1,156,966, a 0.54% decrease year-by-year from 2021. Previously, in 2021, Contra Costa County's population was 1,163,298, a decline of 0.23% compared to a population of 1,165,986 in 2020.
The median age in Contra Costa County, CA is 39.9, as per 2021 ACS 5-Year Estimates. Of the total population, 18.52% were under the age of 15, 18.27% aged 15 to 29, 47.36% aged 30 to 64, 13.95% aged 65 to 84, and 1.89% were 85 years of age and older.
Racial distribution of Contra Costa County population: 49.97% are White, 8.63% are Black or African American, 0.67% are American Indian and Alaska Native, 17.81% are Asian, 0.48% are Native Hawaiian and other Pacific Islander, 11.73% are some other race and 10.70% are multiracial.