How Contra Costa County Compares

Contra Costa County

40.5 years

California Average

40.5 years

Rank #22 of 58 in state

National

38.9 years

4.1% above

National Distribution

Where Contra Costa County falls among all 3,222 U.S. counties for median age.

21.4 years 86.2 years

■ Contra Costa County: 40.5 years

Ranking Context

Rank	County	Value
#1,942	Carbon County, WY	40.6 years
#1,943	Grant County, AR	40.5 years
#1,944	Saline County, AR	40.5 years
#1,945	Contra Costa County, CA	40.5 years
#1,946	Jefferson County, CO	40.5 years
#1,947	Yuma County, CO	40.5 years
#1,948	Berrien County, GA	40.5 years

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Median Age in Contra Costa County, California

Contra Costa County, California has a median age of 40.5 years, which ranks #1,945 of 3,222 out of 3,222 counties nationwide. This is 4.1% above the national value of 38.9 years.

Within California, Contra Costa County ranks #22 of 58 out of 58 counties. This places it in the 40th percentile nationally.

The median age of the total population. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.

About this data

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.