| Official Name: | Muir Beach |
| Settlement Type: | Census designated place |
| Mapsize: | 250x200px |
| Image Map1: | Muir Beach CDP, California.gif |
| Map Caption1: | Muir Beach CDP, California |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Marin |
| Government Type: | Community Services District |
| Leader Title: | Board members |
| Leader Name: | See Directors |
| Leader Title1: | Supervisor |
| Leader Name1: | District 4 Dennis Rodoni[1] |
| Leader Title2: | State senator |
| Leader Name2: | Mark Leno (D) |
| Leader Title3: | Assemblymember |
| Leader Title4: | U. S. rep. |
| Leader Name4: | [2] |
| Established Date: | 1958 |
| Unit Pref: | US |
| Area Footnotes: | [3] |
| Area Total Sq Mi: | 0.493 |
| Area Land Sq Mi: | 0.493 |
| Area Water Sq Mi: | 0 |
| Area Water Percent: | 0 |
| Elevation Footnotes: | [4] |
| Elevation Ft: | 312 |
| Elevation M: | 95 |
| Coordinates: | 37.8622°N -122.5814°W |
| Population As Of: | 2020 |
| Population Footnotes: | [5] |
| Population Total: | 304 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Timezone: | Pacific |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Postal Code Type: | ZIP code |
| Postal Code: | 94965 |
| Area Code Type: | Area codes |
| Area Code: | 415/628 |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature IDs |
| Blank1 Info: | , |
Muir Beach is a census designated place (CDP), unincorporated community, and beach on the Pacific Ocean. The community is located 16.5miles northwest of San Francisco in western Marin County, California, United States. Unlike many other entities in the area, it is not named directly in honor of conservationist John Muir; instead, it was named after Muir Woods National Monument to capitalize on the latter's popularity.[6] The population was 304 at the 2020 census.[5] The community itself flanks the northwest side of the beach.
Located about 2miles from the entrance to Muir Woods, the beach is about long and wide, with coarse sand and several large boulders. Redwood Creek empties into the beach. There is a parking lot at the beach, which is accessible via a footbridge.
The subdivision of homes was formerly called Bello Beach, and the beach itself was formerly called Big Lagoon after a freshwater lagoon that was located where the parking lot is now. Damage from 20th century dairy farms interfered with the flow of the creek and the lagoon.[7]
According to the United States Census Bureau, the CDP has a total area of, all of it land.[3] California State Route 1 leads northeast 6miles to U.S. Route 101 near Sausalito and northwest to Point Reyes Station.
The beach is one of the cleanest in the state.[8]
At the 2010 census Muir Beach had a population of 310. The population density was 629sp=usNaNsp=us. The racial makeup of Muir Beach was 283 (91.3%) White, 5 (1.6%) African American, 1 (0.3%) Native American, 12 (3.9%) Asian, 1 (0.3%) from other races, and 8 (2.6%) from two or more races. Hispanic or Latino of any race were 7 people (2.3%).[9]
The census reported that 95.8% of the population lived in households and 4.2% lived in non-institutionalized group quarters.
There were 141 households, 27 (19.1%) had children under the age of 18 living in them, 79 (56.0%) were opposite-sex married couples living together, 4 (2.8%) had a female householder with no husband present, 3 (2.1%) had a male householder with no wife present. There were 11 (7.8%) unmarried opposite-sex partnerships, and 1 (0.7%) same-sex married couples or partnerships. 39 households (27.7%) were one person and 11 (7.8%) had someone living alone who was 65 or older. The average household size was 2.11. There were 86 families (61.0% of households); the average family size was 2.47.
The age distribution was 38 people (12.3%) under the age of 18, 10 people (3.2%) aged 18 to 24, 56 people (18.1%) aged 25 to 44, 138 people (44.5%) aged 45 to 64, and 68 people (21.9%) who were 65 or older. The median age was 52.6 years. For every 100 females, there were 102.6 males. For every 100 females aged 18 and over, there were 106.1 males.
There were 162 housing units at an average density of 328.7sp=usNaNsp=us, of which 73.8% were owner-occupied and 26.2% were occupied by renters. The homeowner vacancy rate was 1.0%; the rental vacancy rate was 2.6%. 75.2% of the population lived in owner-occupied housing units and 20.6% lived in rental housing units.
At the 2000 census there were 295 people, 131 households, and 69 families in the CDP. The population density was 596.8sp=usNaNsp=us. There were 144 housing units at an average density of 291.3sp=usNaNsp=us. The racial makeup of the CDP in 2010 was 89.7% non-Hispanic White, 0.8% non-Hispanic African American, 3.9% Asian, and 2.6% from two or more races. Hispanic or Latino of any race were 2.3%.[10]
Of the 131 households 19.1% had children under the age of 18 living with them, 45.0% were married couples living together, 5.3% had a female householder with no husband present, and 46.6% were non-families. 30.5% of households were one person and 7.6% were one person aged 65 or older. The average household size was 2.22 and the average family size was 2.67.
The age distribution was 14.2% under the age of 18, 2.7% from 18 to 24, 26.1% from 25 to 44, 46.8% from 45 to 64, and 10.2% 65 or older. The median age was 48 years. For every 100 females, there were 90.3 males. For every 100 females aged 18 and over, there were 91.7 males.
The median household income was $125,402 and the median family income was $152,174. The per capita income for the CDP was $66,476. None of the families and 10.5% of the population were living below the poverty line.[11]
Much of Muir Beach is in the Mill Valley School District, while a portion is in the Bolinas-Stinson Union Elementary School District. All of Muir Beach is in the Tamalpais Union High School District,[12] and the Marin Community College District.
Students attend public schools in or near Mill Valley at Tamalpais Valley Elementary School (kindergarten - grade 5), Mill Valley Middle School (grades 6 - 8), and Tamalpais High School (grades 9 - 12).[13]
According to the Köppen Climate Classification system, Muir Beach has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps. Like much of the California coast, summer afternoons are often cool and windy (and sometimes foggy) as winds blow in off the ocean. It receives a good amount of rain with of rain.
Muir Beach is unincorporated, receiving general government services from Marin County, including law enforcement, land-use planning, library, public health, and code enforcement. A special district, the Muir Beach Community Services District, provides local services, including fire protection, water, road maintenance, and recreation. The District has a board of directors, with five members elected to four-year terms. The District includes all of the Muir Beach CDP, plus Green Gulch Farm. (See map of MBCSD.)[14]
On December 11, 1965, Muir Beach was the site of the Third Acid Test.[15]