Explore Clayton local geography, civic resources and voter guides, with dated official population and registration facts for Contra Costa County.
At a glance: Clayton is an incorporated city in Contra Costa County. Population: 10,759 (California Department of Finance estimate as of January 1, 2026). Registered voters: 8,568 (California Secretary of State, as of September 4, 2026).
Clayton sits in the upper Clayton Valley beneath Mount Diablo's northern slopes. Its compact historic commercial district and surrounding foothill neighborhoods give the city a different scale from neighboring Concord. The Grove provides downtown picnic space, a gazebo, and a children's play area. Endeavor Hall adds a historic indoor community venue: the former church building served municipal meetings before the library was completed in 1995. Clayton's recorded incorporation date is March 18, 1964, following the incorporation election earlier that month. It is a general-law municipality with council-manager government.
Yes. The city offers reservations for designated picnic areas, the gazebo, and other portions of the park, subject to its rental policies.
Yes. The city publishes facility features, rental applications, and policies for the historic hall.
That was the incorporation-election date described in the city's history. The Secretary of State's roster records incorporation on March 18, 1964.
8,568 (California Secretary of State, as of September 4, 2026).
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