Explore Fairfax local geography, civic resources and voter guides, with dated official population and registration facts for Marin County.
At a glance: Fairfax is an incorporated city in Marin County. Population: 7,414 (California Department of Finance estimate as of January 1, 2026). Registered voters: 5,960 (California Secretary of State, as of September 4, 2026).
Fairfax lies at the western end of Marin's central urban corridor, where wooded hills narrow around a small downtown. Its position near open-space routes and the transition toward west Marin gives it a distinctly inland, trail-oriented setting. Peri Park and the adjacent downtown civic area provide outdoor gathering space close to local shops and Town Hall. The Fairfax branch of Marin County Free Library adds an important public indoor resource. Fairfax incorporated on March 2, 1931. It is a general-law town with a council-manager government, administering municipal matters separately from the surrounding unincorporated hills.
Peri Park is near the downtown civic area off Bolinas Road.
Not necessarily. Verify your address using Marin County's jurisdiction guidance before assuming town permitting or ballot eligibility applies.
Contact the town clerk for municipal nomination information and use Marin County Elections for voter services and official results.
5,960 (California Secretary of State, as of September 4, 2026).
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