![Two refinery drums sit amongst trees in the hills of Contra Costa County. The image is in black and white and contained in a light blue circle.](https://cdn.kqed.org/wp-content/uploads/sites/80/2024/01/Bay-Area-Contra-Costa-County@2x.png)
Contra Costa County
Who do these election results impact?
Contra Costa County has a population of 1,156,966 people. The median age is 40.5, the median household income is $120,061 and 45.1% of residents hold a bachelor’s degree or higher. The most populated cities in the county are Concord, Richmond and Antioch. Source: U.S. Census Bureau