Kentfield (formerly Ross Landing, Tamalpais, and Kent) is a census-designated place (CDP) in Marin County, California, United States, just north of San Francisco. Kentfield is located on the Northwestern Pacific Railroad 2 miles (3.2 km) southwest of downtown San Rafael, at an elevation of 115 feet (35 m). The population was 6,351 at the 2000 census. The ZIP code is 94904, and is shared with the neighboring community of Greenbrae.