In 2019, Contra Costa County, CA had a population of 1.15M people with a median age of 40 and a median household income of $107,135. Between 2018 and 2019 the population of Contra Costa County, CA grew from 1.15M to 1.15M, a 0.288% increase and its median household income grew from $101,618 to $107,135, a 5.43% increase.
The 5 largest ethnic groups in Contra Costa County, CA are White (Non-Hispanic) (42.5%), Asian (Non-Hispanic) (17.6%), Other (Hispanic) (13.7%), White (Hispanic) (9.61%), and Black or African American (Non-Hispanic) (8.64%). 37% of the households in Contra Costa County, CA speak a non-English language at home as their primary language.
88.6% of the residents in Contra Costa County, CA are U.S. citizens.
The largest universities in Contra Costa County, CA are Diablo Valley College (3,728 degrees awarded in 2020), Los Medanos College (2,631 degrees), and Contra Costa College (1,779 degrees).
In 2019, the median property value in Contra Costa County, CA was $687,600, and the homeownership rate was 65.4%. Most people in Contra Costa County, CA drove alone to work, and the average commute time was 36.5 minutes. The average car ownership in Contra Costa County, CA was 2 cars per household.
Contra Costa County, CA borders Alameda County, CA, Marin County, CA, Sacramento County, CA, San Francisco County, CA, San Joaquin County, CA, Solano County, CA, and Sonoma County, CA.