Explore Orinda local geography, civic resources and voter guides, with dated official population and registration facts for Contra Costa County.
At a glance: Orinda is an incorporated city in Contra Costa County. Population: 19,412 (California Department of Finance estimate as of January 1, 2026). Registered voters: 15,355 (California Secretary of State, as of September 4, 2026).
Orinda lies just east of the Berkeley Hills along the Highway 24 corridor. Its village-scale commercial areas sit among wooded slopes and residential valleys, with the hills separating it from the bayside cities to the west. Orinda Community Center Park places lawns, playgrounds, picnic tables, and tennis courts beside the community center on Orinda Way. The adjoining facilities create a recognizable civic and recreation gathering area. Orinda incorporated on July 1, 1985. It is a general-law city with council-manager government, with the council setting policy and the city manager administering municipal operations.
It is beside the community center at 28 Orinda Way.
Yes. The city's park page links to picnic and court reservation information and rules.
Contra Costa County Elections provides registration, ballot, and voting-location services.
15,355 (California Secretary of State, as of September 4, 2026).
CA Slates began with shared voter guides in 2012 and expanded into its current publication family and connected program.