Fairfax is an incorporated town in Marin County, California, United States. Fairfax is located 3.25 miles (5.2 km) west-northwest of San Rafael, at an elevation of 115 feet (35 m). The population is 7,441 at the 2010 census.
According to the United States Census Bureau, the town has a total area of 2.2 square miles (5.7 km²), all of it land.
The 2010 United States Census reported that Fairfax had a population of 7,441. The population density was 3,376.9 people per square mile (1,303.8/km²). The racial makeup of Fairfax was 6,617 (88.9%) White, 110 (1.5%) African American, 36 (0.5%) Native American, 204 (2.7%) Asian, 4 (0.1%) Pacific Islander, 174 (2.3%) from other races, and 296 (4.0%) from two or more races. Hispanic or Latino of any race were 504 persons (6.8%).