Marin City is an unincorporated community and census-designated place in Marin County, California, United States. As of the 2020 census, it had a population of 2,993, up from 2,666 in 2010. It is located 1.5 miles northwest of downtown Sausalito, 8 miles south-southeast of San Rafael, and about 5 miles north of San Francisco from the Golden Gate Bridge, at an elevation of 23 feet.