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Belmont, California
City of Belmont
Aerial view of Belmont, September 2019.JPG
Official seal of Belmont, California
Location of Belmont in San Mateo County, California
Location of Belmont in San Mateo County, California
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Country United States
State California
County San Mateo
Incorporated October 29, 1926
 • Total 4.64 sq mi (12.01 km2)
 • Land 4.63 sq mi (11.99 km2)
 • Water 0.01 sq mi (0.02 km2)  0.19%
43 ft (13 m)
 • Total 28,335
 • Density 6,119.87/sq mi (2,363.11/km2)
Time zone UTC-8 (Pacific)
 • Summer (DST) UTC-7 (PDT)
ZIP code
Area code 650
FIPS code 06-05108
GNIS feature IDs 1658029, 2409826
Belmont 1937
City limits and streets in 1937

Belmont is an affluent city in San Mateo County in the U.S. state of California. It is in the San Francisco Bay Area, on the San Francisco Peninsula about halfway between San Francisco and San Jose. Known for its wooded hills, views of the San Francisco Bay and stretches of open space, Belmont is a quiet residential community in the midst of the culturally and technologically rich Bay Area. It was originally part of Rancho de las Pulgas, for which one of its main roads, the Alameda de las Pulgas, is named. The city was incorporated in 1926. Its population was 28,335 at the 2020 census.

Ralston Hall is a historic landmark built by Bank of California founder William Chapman Ralston on the campus of Notre Dame de Namur University, and is also home to Notre Dame High School. It was built around a villa formerly owned by Count Leonetto Cipriani [fr], an Italian aristocrat. The locally famous "Waterdog Lake" is also located in the foothills and highlands of Belmont. A surviving structure from the Panama-Pacific International Exposition is on Belmont Avenue (another is the Palace of Fine Arts in San Francisco). The building was brought to Belmont by E.D. Swift shortly after the exposition closed in 1915.

The city is bordered by San Mateo to the north, Half Moon Bay to the west, Redwood Shores to the east, and San Carlos to the south.

Belmont has a smoking ordinance, passed in January 2009, which bans smoking in all businesses and multi-story apartments and condominiums; the ordinance has been described as one of the strictest in the nation.


The name seems to derive from the Italian "bel monte," which means "beautiful mountain." It was allegedly named such because of its "symmetrically rounded eminence" nearby.


Belmont Caltrain station
Train station in Belmont

Belmont is located at 37°31′5″N 122°17′30″W / 37.51806°N 122.29167°W / 37.51806; -122.29167 (37.518087, -122.291673).

According to the United States Census Bureau, the city has a total area of 4.6 square miles (12 km2) of which 4.6 square miles (12 km2) is land and 0.19% is water.


Historical population
Census Pop.
1880 202
1930 984
1940 1,229 24.9%
1950 5,567 353.0%
1960 15,996 187.3%
1970 23,538 47.1%
1980 24,505 4.1%
1990 24,127 −1.5%
2000 25,123 4.1%
2010 25,835 2.8%
2020 28,335 9.7%
U.S. Decennial Census


At the 2010 census Belmont had a population of 25,835. The population density was 5,579.8 people per square mile (2,154.4/km2). The racial makeup of Belmont was 17,455 (67.6%) White, 420 (1.6%) African American, 72 (0.3%) Native American, 5,151 (19.9%) Asian, 198 (0.8%) Pacific Islander, 964 (3.7%) from other races, and 1,572 (6.1%) from two or more races. Hispanic or Latino of any race were 2,977 persons (11.5%).

The census reported that 25,321 people (98.0% of the population) lived in households, 394 (1.5%) lived in non-institutionalized group quarters, and 120 (0.5%) were institutionalized.

There were 10,575 households, 3,251 (30.7%) had children under the age of 18 living in them, 5,630 (53.2%) were opposite-sex married couples living together, 830 (7.8%) had a female householder with no husband or wife present, 391 (3.7%) had a male householder with no wife or husband present. There were 510 (4.8%) unmarried opposite-sex partnerships, and 96 (0.9%) same-sex married couples or partnerships. 2,904 households (27.5%) were one person and 997 (9.4%) had someone living alone who was 65 or older. The average household size was 2.39. There were 6,851 families (64.8% of households); the average family size was 2.95.

The age distribution was 5,395 people (20.9%) under the age of 18, 1,668 people (6.5%) aged 18 to 24, 7,645 people (29.6%) aged 25 to 44, 7,284 people (28.2%) aged 45 to 64, and 3,843 people (14.9%) who were 65 or older. The median age was 40.9 years. For every 100 females, there were 95.4 males. For every 100 females age 18 and over, there were 92.5 males.

There were 11,028 housing units at an average density of 2,381.8 per square mile, of the occupied units 6,280 (59.4%) were owner-occupied and 4,295 (42.0%) were rented. The homeowner vacancy rate was 0.7%; the rental vacancy rate was 5.2%. 16,473 people (63.8% of the population) lived in owner-occupied housing units and 8,848 people (34.2%) lived in rental housing units.


At the 2000 census there were 25,123 people in 10,418 households, including 6,542 families, in the city. The population density was 5,551.1 people per square mile (2,141.3/km2). There were 10,577 housing units at an average density of 2,337.1 per square mile (901.5/km2). Of the 10,418 households 26.4% had children under the age of 18 living with them, 52.6% were married couples living together, 7.1% had a female householder with no husband present, and 37.2% were non-families. 27.2% of households were one person and 7.3% were one person aged 65 or older. The average household size was 2.35 and the average family size was 2.89.

The age distribution was 19.3% under the age of 18, 6.5% from 18 to 24, 35.9% from 25 to 44, 25.1% from 45 to 64, and 13.2% 65 or older. The median age was 39 years. For every 100 females, there were 96.7 males. For every 100 females age 18 and over, there were 94.6 males.

According to a 2007 estimate, the median income for a household in the city was $99,739, and the median family income was $122,515. Males had a median income of $63,281 versus $46,957 for females. The per capita income for the city was $42,812. About 1.7% of families and 4.0% of the population were below the poverty line, including 3.2% of those under age 18 and 4.8% of those age 65 and over.

In May 2009, Belmont was ranked 11th on Forbes list of "America's Top 25 Towns to Live Well."

Sister cities


Top employers

According to the city's 2021 Comprehensive Annual Financial Report, the top employers in 2021 were:

# Employer # of Employees
1 RingCentral, Inc. 693
2 Autobahn Motors 129
3 Safeway Store #1138 112
4 Volkswagen Group of America 109
5 Nikon Precision, Inc. 95
6 Silverado Senior Living 95
7 Lunardi's Market 82
8 James Electronics Ltd. 62
9 Woodmont Real Estate Services 57
10 Merry Moppet Preschool, Inc. 55


Public schools

The public schools in Belmont are highly rated. The public schools in Belmont are run by the Belmont-Redwood Shores School District (BRSSD). The public high school in Belmont, Carlmont High School, however, is in Sequoia Union High School District.

Elementary schools

  • Central
  • Cipriani
  • Fox
  • Nesbit

Middle school

  • Ralston Middle School, California Distinguished School

High school

  • Carlmont High School, California Distinguished School

Private schools

  • Immaculate Heart of Mary School (Preschool through 8th Grade)
  • Notre Dame High School
  • Charles Armstrong School specializing in language-based learning differences, such as dyslexia


  • Notre Dame de Namur University

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