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Is Contra Costa County the best California county for your business?

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Contra Costa County Population

All Contra Costa County population data above are from the US Census Bureau.

The population data for Contra Costa County are from the Census 2000, Census 2010, the Census' American Community Survey 2015 5-year estimates and the Census' 2016 Population Estimates. The demographic data for Fresno County, Kern County, Orange County, and Ventura County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2015 5-year estimates, and were downloaded on December 2016. Check out our FAQ section for more details.

Contra Costa County Demographics Summary

population icon Population

With 1,135,127 people, Contra Costa County is the 9th most populated county in the state of California out of 58 counties. But watch out, Contra Costa County, because Fresno County with 979,915 people and Kern County with 884,788 people are right behind you.

race icon Race & Ethnicity

The largest Contra Costa County racial/ethnic groups are White (46.0%) followed by Hispanic (24.9%) and Asian (15.1%).

income icon Median Income

In 2015, the median household income of Contra Costa County residents was $80,185. Contra Costa County households made slightly more than Orange County households ($76,509) and Ventura County households ($77,348) . However, 10.9% of Contra Costa County residents live in poverty.

age icon Median Age

The median age for Contra Costa County residents is 38.8 years young.


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