Mill Valley is a city in Marin County, California, United States, located about 14 miles (23 km) north of San Francisco via the Golden Gate Bridge and 52 miles from Napa Valley. The population was 13,903 at the 2010 census. Mill Valley is located on the western and northern shores of Richardson Bay, and the eastern slopes of Mount Tamalpais. Beyond the flat coastal area and marshlands, it occupies narrow wooded canyons, mostly of second-growth redwoods, on the southeastern slopes of Mount Tamalpais. The Mill Valley 94941 ZIP Code also includes the following adjacent unincorporated communities: Almonte, Alto, Homestead Valley, Tamalpais Valley, and Strawberry. The Muir Woods National Monument is also located just outside the city limits.
Mill Valley hosts a range of cultural activities such as the internationally recognized Mill Valley Film Festival, which brings in leading filmmakers and movie aficionados from across the country. Locals throughout the Bay Area come for the annual events, including Wine & Gourmet Food Tasting, the Mill Valley Fall Arts Festival and Winterfest. They also enjoy Mill Valley's nightlife, with live theatre, music and comic venues, where famous guest artists are known to "drop in" for an evening to entertain.