City · California
Belmont, California
Belmont, city, in San Mateo County, California. Belmont had 28,752 residents on July 1, 2025 by the Census Bureau's estimate, up 1.5% since 2020; the 2020 Census counted 28,335 and the ACS 2020-2024 5-year estimates put it at 27,337 (±45). GEOID 0605108.
Residents, July 2025 estimate
28,752
Census Bureau estimate (no margin published)
2020 Census count: 28,335 · ACS 2020-2024: 27,337 ±45
Median household income
$205,297
±$18,232 (90% margin)
California: $99,122
Median home value
$2,000,000 or more
The survey's top or bottom value; no margin is published
California: $734,700
Median gross rent
$2,875
±$108 (90% margin)
California: $2,036
Where is Belmont and what county is it in?
Belmont is a city in San Mateo County, California. It covers 4.6 square miles of land, 6,120 residents per square mile in 2020.
Belmont is in the San Francisco-Oakland-Fremont, CA metropolitan statistical area, which takes in 5 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Belmont, and is it growing?
The Census Bureau estimates that 28,752 people lived in Belmont on July 1, 2025, up 1.5% since 2020, while California shrank 0.5%. The 2020 Census counted 28,335 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 27,337 (±45).
| Measure | Belmont | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 27,337 ±45 | 742,340 | +240 |
| Households | 10,500 ±295 | 264,419 | no clear change |
| Average household size | 2.53 ±0.07 | 2.76 | no clear change |
| Housing units | 11,346 ±296 | 287,184 | no clear change |
Belmont's population since 2000
From 25,123 in 2000 to 28,752 in 2025: up 14.4%. The 2000, 2010 and 2020 figures are census counts, each for Belmont as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Belmont?
The median resident of Belmont is 39.8 years old; 23.7% are under 18 and 13.9% are 65 or older. The largest group is non-Hispanic white residents at 45.8%, then non-Hispanic Asian residents at 30.6%. 30.7% of residents were born outside the United States.
| Measure | Belmont | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.8 ±1.2 | 40.9 | no clear change |
| Under 18 years | 23.7% ±1.8 pts | 19.5% | – |
| 65 years and over | 13.9% ±1.4 pts | 17.8% | – |
| Male | 50.1% ±2.1 pts | 49.8% | – |
| Hispanic or Latino (any race) | 13.1% ±2.7 pts | 24.9% | no clear change |
| White alone, not Hispanic | 45.8% ±3.1 pts | 34.7% | −8.1 pts |
| Black or African American alone, not Hispanic | 1.8% ±0.9 pts | 2.0% | no clear change |
| Asian alone, not Hispanic | 30.6% ±3.2 pts | 31.0% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.3% ±0.4 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.1 pts | 1.1% | – |
| Two or more races, not Hispanic | 7.1% ±1.4 pts | 5.2% | – |
| Some other race alone, not Hispanic | 1.3% ±0.8 pts | 0.9% | – |
| Born outside the United States | 30.7% ±2.8 pts | 35.7% | no clear change |
| Speak a language other than English at home (age 5+) | 38.3% ±2.8 pts | 45.8% | – |
| Civilian veterans (age 18+) | 3.5% ±1.1 pts | 2.9% | – |
| With a disability | 8.6% ±1.6 pts | 9.4% | – |
| No health insurance coverage | 2.6% ±1.1 pts | 3.8% | no clear change |
| High school graduate or higher (age 25+) | 95.5% ±1.5 pts | 90.2% | – |
| Bachelor's degree or higher (age 25+) | 69.7% ±3.2 pts | 53.7% | +5.0 pts |
| Graduate or professional degree (age 25+) | 34.8% ±2.8 pts | 24.1% | – |
| Lived in the same house a year earlier | 85.7% ±2.7 pts | 88.4% | – |
| Moved from another state in the past year | 1.3% ±0.7 pts | 1.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Belmont earn?
Half of Belmont's 10,500 households earn less than $205,297 a year (±$18,232), against $158,855 in San Mateo County and $99,122 in California. In 2015-2019 it was $192,052 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.9% of residents live below the poverty line.
| Measure | Belmont | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $205,297 ±$18,232 | $158,855 | no clear change |
| Mean household income | $264,438 ±$15,979 | $231,822 | – |
| Per capita income | $101,385 ±$5,679 | $84,288 | no clear change |
| People below the poverty line | 6.9% ±2.4 pts | 6.7% | +2.8 pts |
| Children under 18 below the poverty line | 5.2% ±4.9 pts | 6.2% | – |
| Households receiving SNAP | 6.1% ±2.5 pts | 5.1% | – |
| Households with a computer | 98.5% ±0.8 pts | 97.7% | – |
| Households with a broadband subscription | 96.6% ±1.6 pts | 95.7% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Belmont?
Owners occupy 54.8% of Belmont's occupied homes and renters 45.2%. The median owner-occupied home is valued at $2,000,000 or more by its owner (). The median renter pays $2,875 a month including utilities, and 32.3% of renters pay 35% or more of their income on rent.
| Measure | Belmont | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $2,000,000 or more | $1,559,600 | +$120,116 |
| Median gross rent | $2,875 ±$108 | $2,922 | no clear change |
| Renters paying 35% or more of income on rent | 32.3% ±6.1 pts | 40.3% | no clear change |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more | – |
| Owner-occupied homes | 54.8% ±3.5 pts | 58.5% | −6.0 pts |
| Renter-occupied homes | 45.2% ±3.5 pts | 41.5% | – |
| Housing units | 11,346 ±296 | 287,184 | no clear change |
| Homeowner vacancy rate | 0.0% ±0.7 pts | 0.7% | – |
| Rental vacancy rate | 7.9% ±3.6 pts | 8.5% | – |
| Single-family detached homes | 54.3% ±3.6 pts | 55.3% | – |
| Mobile homes | 0.0% ±0.4 pts | 1.1% | – |
| Built 2020 or later | 0.7% ±0.9 pts | 1.0% | – |
| Built 2010 to 2019 | 2.8% ±1.4 pts | 5.4% | – |
| Built 1939 or earlier | 3.5% ±1.2 pts | 8.6% | – |
| Households with no vehicle | 5.1% ±2.5 pts | 5.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Belmont building?
Builders took permits for 3 new housing units in Belmont in 2025 (3 in single-family houses), 0.1 per 1,000 residents against 2.6 across California.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Belmont work and get to work?
52.2% of Belmont's workers drive alone and 33.7% work from home. The average trip to work takes 28.5 minutes. The unemployment rate in 2020-2024 averaged 7.2%.
| Measure | Belmont | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 68.2% ±2.2 pts | 67.3% | – |
| Unemployment rate | 7.2% ±2.7 pts | 4.8% | +4.0 pts |
| Drove alone to work | 52.2% ±4.5 pts | 56.7% | – |
| Carpooled | 6.1% ±1.8 pts | 8.7% | – |
| Public transportation | 4.7% ±1.9 pts | 5.1% | – |
| Walked | 2.0% ±0.9 pts | 2.3% | – |
| Worked from home | 33.7% ±4.4 pts | 24.3% | +28.1 pts |
| Mean travel time to work | 28.5 min ±2.0 | 26.4 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Belmont?
5 census tracts lie mostly in Belmont (2020 census blocks). Their median household incomes run from $146,389 (Tract 6086) to $250,000 or more (Tract 6088).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 6087San Mateo County | 7,142 | $238,466 |
| Tract 6088San Mateo County | 6,046 | $250,000 or more |
| Tract 6089San Mateo County | 6,953 | $177,895 |
| Tract 6086San Mateo County | 4,484 | $146,389 |
| Tract 6090San Mateo County | 2,983 | $203,636 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Belmont) · Census block assignment files
How does Belmont compare with other places in California?
By the Census Bureau's July 2025 estimates, Belmont is the 1,403rd-most populous of the 19,476 U.S. incorporated places that have one and the 251st-most populous of 483 in California.
Belmont ranks 67th of 1,037 places in California with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 251st | 483 |
| Growth 2020-2025 (PEP) | 120th | 469 |
| Residents per square mile | 181st | 1,077 |
| Median household income | 67th | 1,037 |
| Per capita income | 79th | 1,073 |
| Median home value | 1st | 1,054 |
| Median gross rent | 119th | 987 |
| Poverty rate | 654th | 836 |
| Bachelor's degree or higher | 96th | 988 |
| Median age | 533rd | 1,075 |
| Owner-occupied share | 807th | 1,064 |
| Work from home | 80th | 822 |
| Travel time to work | 483rd | 1,069 |
Belmont's figures with every place in California (CSV)
Every place in California, sortable · Compare Belmont with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Belmont?
6 of the 57 figures for Belmont on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Belmont are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Belmont.