Explore Rohnert Park local geography, civic resources and voter guides, with dated official population and registration facts for Sonoma County.
At a glance: Rohnert Park is an incorporated city in Sonoma County. Population: 44,191 (California Department of Finance estimate as of January 1, 2026). Registered voters: 28,249 (California Secretary of State, as of September 4, 2026).
Rohnert Park occupies the southern Santa Rosa Plain next to Cotati, with planned residential neighborhoods and a broad network of local streets. Sonoma State University, in the city's eastern area, adds an educational dimension to its suburban setting. The Rohnert Park Community Center and municipal aquatic facilities support organized recreation. Roberts Lake and the Rohnert Park–Cotati Regional Library provide additional outdoor and public-learning destinations. Rohnert Park incorporated on August 28, 1962. It is a general-law city with a council-manager government, maintaining separate municipal institutions from adjoining Cotati.
Yes. Its campus is on East Cotati Avenue in Rohnert Park; university services and municipal services are administered separately.
Yes. The Rohnert Park–Cotati Regional Library is part of the Sonoma County Library system.
Use your registered residential address with the Sonoma County Registrar of Voters, and contact the city clerk for municipal nomination questions.
28,249 (California Secretary of State, as of September 4, 2026).
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