San Mateo, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of San Mateo, California is 103,555 as of the 2023 American Community Survey, making it the 72nd-largest city in California. The median household income is $152,669, the median home value is $1,563,200, and the median age is 38.0.
The population has grown 5.8% since 2010 (97,383 → 103,006).
103,555
Population
8534
People / sq mi
$152,669
Median Income
$1,563,200
Median Home Value
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San Mateo covers 12.1 sq mi of land at 8534 people per square mile.
About San Mateo, CA
Housing cost is the defining feature of San Mateo: the median home is valued at $1,563,200. With 103,555 residents, San Mateo is a city in California.
Households here are among the highest-earning of all US cities: median income is $152,669, above the US median of $78,538. Only 4.6% of residents live in poverty, below the national 12.4%. Real estate commands a premium here — a median home value of $1,563,200, with typical rent around $3,079.
About 57.6% of adults 25 and older have a bachelor’s degree, above the 35.0% national figure. Remote work is on the higher side at 22.3%, above the national 14.0%, and the average commute runs about 27 minutes each way.
High housing values reframe the income picture in San Mateo — even solid earnings stretch less against home prices and rents at this level.
San Mateo city Population History (2010-2024)
The city of San Mateo city had a population of 97,383 in 2010 and 103,006 in 2024, a 5.8% growth over 14 years. The peak was 105,658 in 2020. Average annual growth rate: 0.41%.
103,006
Population (2024)
97,383
Population (2010)
105,658
Peak (2020)
0.41%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 97,383 |
| 2011 | 98,518 |
| 2012 | 99,816 |
| 2013 | 101,323 |
| 2014 | 102,695 |
| 2015 | 103,509 |
| 2016 | 104,357 |
| 2017 | 104,389 |
| 2018 | 104,885 |
| 2019 | 104,430 |
| 2020 | 105,658 |
| 2021 | 102,900 |
| 2022 | 101,956 |
| 2023 | 102,098 |
| 2024 | 103,006 |
Race & Ethnicity
| White | 41.2% |
| Black or African American | 1.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.3% |
| Two or More Races | 0.1% |
Economy & Income
$152,669
Median Household Income
$80,312
Per Capita Income
4.6%
Poverty Rate
3.0%
Unemployment Rate
Housing
$1,563,200
Median Home Value
$3,079
Median Rent
50.8%
Owner-Occupied
Education
90.2%
High School+
57.6%
Bachelor's+
Commute
6.1%
Drive Alone
58.5%
Public Transit
22.3%
Work From Home
27.1 min
Avg Commute
Community Profile
15.5%
Foreign Born
54.9%
Non-English at Home
2.6%
Veterans
8.9%
With Disability
95.7%
Health Insurance
97.8%
Internet Access
Employment by Industry
| Finance, Insurance & Real Estate | 25.8% |
| Professional, Scientific & Management | 19.7% |
| Manufacturing | 7.9% |
| Information | 6.7% |
| Transportation & Warehousing | 6.3% |
| Education, Health Care & Social Services | 6.1% |
| Retail Trade | 5.1% |
| Construction | 4.8% |
| Arts, Entertainment & Food Services | 3.9% |
| Public Administration | 3.0% |
| Agriculture & Mining | 0.6% |
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Frequently Asked Questions
San Mateo, California has a population of 103,555 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 72nd-largest city in California.
The median household income in San Mateo, California is $152,669, with 4.6% of residents living below the federal poverty level.
The median home value in San Mateo, California is $1,563,200, with median monthly rent at $3,079 and a homeownership rate of 50.8%.
The median age in San Mateo, California is 38.0 years. The population is 49.6% male and 50.4% female.
The population has grown 5.8% since 2010 (97,383 → 103,006).
San Mateo city, CA Climate
San Mateo city, CA has an average annual temperature of 14.4°C (58°F) and receives about 523 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
14.4°C
Avg Temp
523
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 10° / 49° | 108 mm |
| February | 11° / 53° | 91 mm |
| March | 12° / 54° | 83 mm |
| April | 14° / 56° | 34 mm |
| May | 15° / 60° | 10 mm |
| June | 17° / 63° | 3 mm |
| July | 18° / 65° | 1 mm |
| August | 18° / 65° | 2 mm |
| September | 18° / 65° | 6 mm |
| October | 16° / 61° | 31 mm |
| November | 13° / 55° | 75 mm |
| December | 10° / 50° | 79 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit San Mateo city, CA
The most comfortable months to visit San Mateo city, CA are typically August, July and September, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 24°C high). The coldest is January (near 5°C low). January is usually the wettest month.
Where to stay near San Mateo
Visiting or relocating to San Mateo, CA? Compare hotels and short-term rentals across the metro — live availability and prices.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.