City · California
Millbrae, California
Millbrae, city, in San Mateo County, California. Millbrae had 22,869 residents on July 1, 2025 by the Census Bureau's estimate, down 1.5% since 2020; the 2020 Census counted 23,216 and the ACS 2020-2024 5-year estimates put it at 22,689 (±27). GEOID 0647486.
Residents, July 2025 estimate
22,869
Census Bureau estimate (no margin published)
2020 Census count: 23,216 · ACS 2020-2024: 22,689 ±27
Median household income
$163,476
±$11,394 (90% margin)
California: $99,122
Median home value
$1,934,900
±$91,218 (90% margin)
California: $734,700
Median gross rent
$3,272
±$163 (90% margin)
California: $2,036
Where is Millbrae and what county is it in?
Millbrae is a city in San Mateo County, California. It covers 3.3 square miles of land, 7,102 residents per square mile in 2020.
Millbrae 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 Millbrae, and is it growing?
The Census Bureau estimates that 22,869 people lived in Millbrae on July 1, 2025, down 1.5% since 2020, a steeper fall than California's (−0.5%). The 2020 Census counted 23,216 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 22,689 (±27).
| Measure | Millbrae | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 22,689 ±27 | 742,340 | +64 |
| Households | 8,121 ±332 | 264,419 | no clear change |
| Average household size | 2.76 ±0.11 | 2.76 | no clear change |
| Housing units | 8,705 ±402 | 287,184 | no clear change |
Millbrae's population since 2000
From 20,718 in 2000 to 22,869 in 2025: up 10.4%. The 2000, 2010 and 2020 figures are census counts, each for Millbrae 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 Millbrae?
The median resident of Millbrae is 43.7 years old; 19.0% are under 18 and 20.3% are 65 or older. The largest group is non-Hispanic Asian residents at 48.1%, then non-Hispanic white residents at 29.4%. 40.8% of residents were born outside the United States.
| Measure | Millbrae | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 43.7 ±1.8 | 40.9 | no clear change |
| Under 18 years | 19.0% ±1.9 pts | 19.5% | – |
| 65 years and over | 20.3% ±1.8 pts | 17.8% | – |
| Male | 48.4% ±1.8 pts | 49.8% | – |
| Hispanic or Latino (any race) | 13.9% ±2.5 pts | 24.9% | no clear change |
| White alone, not Hispanic | 29.4% ±3.0 pts | 34.7% | −4.5 pts |
| Black or African American alone, not Hispanic | 0.8% ±0.6 pts | 2.0% | – |
| Asian alone, not Hispanic | 48.1% ±3.7 pts | 31.0% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 1.9% ±1.2 pts | 1.1% | – |
| Two or more races, not Hispanic | 4.6% ±1.2 pts | 5.2% | – |
| Some other race alone, not Hispanic | 1.1% ±1.5 pts | 0.9% | – |
| Born outside the United States | 40.8% ±2.8 pts | 35.7% | no clear change |
| Speak a language other than English at home (age 5+) | 48.7% ±3.1 pts | 45.8% | – |
| Civilian veterans (age 18+) | 2.6% ±0.7 pts | 2.9% | – |
| With a disability | 9.3% ±1.5 pts | 9.4% | – |
| No health insurance coverage | 3.6% ±0.8 pts | 3.8% | +1.3 pts |
| High school graduate or higher (age 25+) | 93.6% ±1.5 pts | 90.2% | – |
| Bachelor's degree or higher (age 25+) | 52.7% ±3.3 pts | 53.7% | no clear change |
| Graduate or professional degree (age 25+) | 21.6% ±2.4 pts | 24.1% | – |
| Lived in the same house a year earlier | 88.3% ±2.6 pts | 88.4% | – |
| Moved from another state in the past year | 0.7% ±0.5 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 Millbrae earn?
Half of Millbrae's 8,121 households earn less than $163,476 a year (±$11,394), against $158,855 in San Mateo County and $99,122 in California. In 2015-2019 it was $158,137 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.0% of residents live below the poverty line.
| Measure | Millbrae | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $163,476 ±$11,394 | $158,855 | no clear change |
| Mean household income | $215,347 ±$12,680 | $231,822 | – |
| Per capita income | $78,551 ±$4,425 | $84,288 | +$6,596 |
| People below the poverty line | 6.0% ±1.7 pts | 6.7% | no clear change |
| Children under 18 below the poverty line | 7.2% ±4.8 pts | 6.2% | – |
| Households receiving SNAP | 2.8% ±1.2 pts | 5.1% | – |
| Households with a computer | 97.0% ±2.6 pts | 97.7% | – |
| Households with a broadband subscription | 93.6% ±2.7 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 Millbrae?
Owners occupy 60.8% of Millbrae's occupied homes and renters 39.2%. The median owner-occupied home is valued at $1,934,900 by its owner (±$91,218). The median renter pays $3,272 a month including utilities, and 44.0% of renters pay 35% or more of their income on rent.
| Measure | Millbrae | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $1,934,900 ±$91,218 | $1,559,600 | +$208,113 |
| Median gross rent | $3,272 ±$163 | $2,922 | no clear change |
| Renters paying 35% or more of income on rent | 44.0% ±6.5 pts | 40.3% | +9.6 pts |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more | – |
| Owner-occupied homes | 60.8% ±3.0 pts | 58.5% | no clear change |
| Renter-occupied homes | 39.2% ±3.0 pts | 41.5% | – |
| Housing units | 8,705 ±402 | 287,184 | no clear change |
| Homeowner vacancy rate | 0.8% ±0.9 pts | 0.7% | – |
| Rental vacancy rate | 5.9% ±3.6 pts | 8.5% | – |
| Single-family detached homes | 61.1% ±3.0 pts | 55.3% | – |
| Mobile homes | 0.0% ±0.5 pts | 1.1% | – |
| Built 2020 or later | 1.0% ±0.6 pts | 1.0% | – |
| Built 2010 to 2019 | 4.8% ±1.7 pts | 5.4% | – |
| Built 1939 or earlier | 6.4% ±1.3 pts | 8.6% | – |
| Households with no vehicle | 7.8% ±2.8 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 Millbrae building?
Builders took permits for 150 new housing units in Millbrae in 2025 (8 in single-family houses; the permit office reported 7 of 12 months), 6.6 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 Millbrae work and get to work?
59.0% of Millbrae's workers drive alone and 22.2% work from home. The average trip to work takes 28.6 minutes. The unemployment rate in 2020-2024 averaged 5.7%.
| Measure | Millbrae | San Mateo County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.8% ±2.2 pts | 67.3% | – |
| Unemployment rate | 5.7% ±1.7 pts | 4.8% | +2.2 pts |
| Drove alone to work | 59.0% ±4.0 pts | 56.7% | – |
| Carpooled | 8.1% ±1.8 pts | 8.7% | – |
| Public transportation | 7.5% ±1.4 pts | 5.1% | – |
| Walked | 1.4% ±0.6 pts | 2.3% | – |
| Worked from home | 22.2% ±3.1 pts | 24.3% | +17.4 pts |
| Mean travel time to work | 28.6 min ±1.4 | 26.4 min | −2.1 min |
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 Millbrae?
6 census tracts lie mostly in Millbrae, and 1 more reaches into it (2020 census blocks). Their median household incomes run from $133,654 (Tract 6044) to $226,667 (Tract 6047).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 6048San Mateo County | 5,464 | $158,235 |
| Tract 6044San Mateo County | 5,131 | $133,654 |
| Tract 6045San Mateo County | 3,574 | $188,750 |
| Tract 6049San Mateo County | 3,140 | $148,421 |
| Tract 6047San Mateo County | 2,793 | $226,667 |
| Tract 6046San Mateo County | 2,587 | $192,054 |
| Tract 6135.01San Mateo County | 4,379 | $172,869 |
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 Millbrae) · Census block assignment files
How does Millbrae compare with other places in California?
By the Census Bureau's July 2025 estimates, Millbrae is the 1,734th-most populous of the 19,476 U.S. incorporated places that have one and the 285th-most populous of 483 in California.
Millbrae ranks 112th 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 | 285th | 483 |
| Growth 2020-2025 (PEP) | 227th | 469 |
| Residents per square mile | 139th | 1,077 |
| Median household income | 112th | 1,037 |
| Per capita income | 155th | 1,073 |
| Median home value | 66th | 1,054 |
| Median gross rent | 64th | 987 |
| Poverty rate | 701st | 836 |
| Bachelor's degree or higher | 208th | 988 |
| Median age | 362nd | 1,075 |
| Owner-occupied share | 647th | 1,064 |
| Work from home | 250th | 822 |
| Travel time to work | 471st | 1,069 |
Millbrae's figures with every place in California (CSV)
Every place in California, sortable · Compare Millbrae 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 Millbrae?
7 of the 57 figures for Millbrae 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 Millbrae 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 Millbrae.