Fairfax is an incorporated town in Marin County, California, United States. It is located 3.25 miles west-northwest of San Rafael, at an elevation of 115 feet. The geography of Fairfax consists mostly of hills and valleys. Fairfax is the only town in America that holds a Green Party majority in the town council.

The Coast Miwok Indians occupied stretches along local creeks, spring and seep areas; moreover prehistoric habitations were usually chosen near permanent and seasonal drainages, typically along flat ridges and terraces. The first post office opened in 1910. Fairfax became an incorporated town in 1931. The town was named for Lord Charles Snowden Fairfax.

In the mid-1960s, a softball game between Jefferson Airplane and the Grateful Dead took place at Central Field (also known as Contratti Park), a public downtown baseball field. Irving Berlin used to serenade from a treetop piano at Pastori’s Hotel, formerly Bird’s Nest Glen, the home of Lord Charles Snowden Fairfax, and later known as the Marin Town & Country Club.