As of 2025 the population of Contra Costa County is 1,179,591. The population is expected to grow to 1,191,380 by 2030 - a growth rate of 0.20%.
The median age of Contra Costa County residents is 41.
The diversity index of Contra Costa County is 85.0, meaning that there is a 85% chance that any two people selected out of 100 residents will be of different race or ethnicity from one another.
The average household income in Contra Costa County is $181,111 and projected to be $199,477 in 2030. Per capita income is $63,290, projected to be $69,713 in 2030. 10.55% of households – 124,483 – have an income of $200,000 or higher. Average net worth is $2,440,032 and the average disposable income is $125,530.
There are 430,617 housing units in Contra Costa County; 272,582 are owner-occupied, 139,363 are rented, and 18,672 are vacant. The average home value is $1,072,706, with 24,922 homes built in 2010 or later, and 18,054 built in 1939 or earlier.
There are 38,037 businesses in Contra Costa County, employing 367,024 workers and pulling from a labor force of 554,692 age 16 and above. 191,704 workers commute into Contra Costa County from outside the county or state. Key industries for the area include:
360,754 residents both live and work in/around Contra Costa County. The average travel time is 36.0 minutes. 2.53% people have a commute of less than 5 minutes while 9.23% commute 90 minutes or more each way. Of commuters, 337,276 drive alone, 53,779 carpool, and 36,191 take public transportation. 19,934 use other modes of transport such as motorcycle, bicycle, walking, etc. 106,457 residents work from home.
149,086 members of the workforce hold a high school diploma or GED. 71,729 have associates degrees, 244,353 have bachelor’s degrees, and 152,881 hold a graduate or professional degree.
