Demographics of San Mateo city, California

San Mateo city, California had 103,337 people on July 1, 2025, by the Census Bureau’s estimate: −2,332 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

San Mateo city, in four figures

103,337
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 103,105 ±92.; −2.2%
Change since July 2020: −2,332 people.; 38.3 ±0.7
Median age: ACS 2020–⁠2024.; $153,504 ±$7,504
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. The Bureau publishes no births, deaths or migration for a place, so the change is the difference between one July estimate and the next.

San Mateo city, California's population shrank 2.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of San Mateo city, California's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

San Mateo city, California's population shrank 2.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of San Mateo city, California's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	105,669	100.0	100.0
2021	102,944	97.4	100.2
2022	101,952	96.5	100.7
2023	102,078	96.6	101.6
2024	102,856	97.3	102.5
2025	103,337	97.8	103.1

Population of San Mateo city, California on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	105,669	—
2021	102,944	−2,725
2022	101,952	−992
2023	102,078	+126
2024	102,856	+778
2025	103,337	+481

Age, 2020–2024

The median age is 38.3 ±0.7: for men 36.4 ±1.0 and for women 40.2 ±0.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in San Mateo city by age, ACS 2020–2024
Age	People	Share	California	United States
Under 5	6,099 ±561	5.9% ±0.5	5.5% ±<0.1	5.6% ±<0.1
5 to 17	14,112 ±913	13.7% ±0.9	16.5% ±<0.1	16.3% ±<0.1
18 to 24	7,338 ±718	7.1% ±0.7	9.1% ±<0.1	9.1% ±<0.1
25 to 44	33,705 ±1,400	32.7% ±1.4	28.7% ±<0.1	26.9% ±<0.1
45 to 64	24,288 ±1,087	23.6% ±1.1	24.6% ±<0.1	24.8% ±<0.1
65 and over	17,563 ±891	17.0% ±0.9	15.7% ±<0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $153,504 ±$7,504, and income per person $84,247 ±$2,998, in 2024 dollars. The median is $99,122 ±$310 in California and $80,734 ±$166 in the United States.

Households by income

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Households in San Mateo city by income, ACS 2020–2024
Household income	Households	Share	California	United States
Under $25,000	3,247 ±450	8.1% ±1.1	12.5% ±0.1	14.6% ±<0.1
$25,000 to $49,999	4,001 ±595	10.0% ±1.5	13.3% ±0.1	16.7% ±<0.1
$50,000 to $74,999	3,365 ±425	8.4% ±1.1	13.0% ±0.1	15.5% ±<0.1
$75,000 to $99,999	3,114 ±433	7.8% ±1.1	11.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	5,894 ±578	14.8% ±1.4	17.8% ±0.1	17.5% ±<0.1
$150,000 to $199,999	4,779 ±547	12.0% ±1.3	11.3% ±0.1	9.6% ±<0.1
$200,000 or more	15,495 ±691	38.8% ±1.5	20.5% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in San Mateo city by age, ACS 2020–2024
Age	Below poverty	Rate	California	United States
All ages	8,429 ±1,188	8.2% ±1.2	12.0% ±0.1	12.5% ±0.1
Under 18	1,772 ±466	9.0% ±2.3	15.0% ±0.1	16.1% ±0.1
18 to 59	3,908 ±629	6.6% ±1.0	11.0% ±0.1	11.6% ±0.1
60 and over	2,749 ±443	11.9% ±1.8	11.5% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in San Mateo city, ACS 2020–2024
Measure	San Mateo city	California	United States
Housing units	42,641 ±790	14,644,735 ±1,665	143,775,355 ±10,234
Occupied	93.6% ±0.8	92.5% ±0.1	89.9% ±0.1
Vacant	6.4% ±0.9	7.5% ±0.1	10.1% ±0.1
Owner occupied	49.9% ±1.5	55.9% ±0.3	65.2% ±0.3
Renter occupied	50.1% ±1.8	44.1% ±0.2	34.8% ±0.1
Median home value	$1,618,700 ±$35,518	$734,700 ±$1,307	$332,700 ±$236
Median gross rent	$3,077 ±$100	$2,036 ±$5	$1,413 ±$2
Median year built	1965 ±2	1976 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in San Mateo city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	California	United States
Hispanic or Latino	28,418 ±1,941	27.6% ±1.9	40.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	35,492 ±1,656	34.4% ±1.6	33.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	1,454 ±336	1.4% ±0.3	5.2% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	28,820 ±1,569	28.0% ±1.5	15.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	152 ±63	0.1% ±0.1	0.3% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	1,369 ±468	1.3% ±0.5	0.3% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	1,223 ±440	1.2% ±0.4	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	6,177 ±776	6.0% ±0.8	4.4% ±<0.1	4.3% ±<0.1

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in San Mateo city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	California	United States
Born in the state	49,622 ±1,397	48.1% ±1.4	56.5% ±0.1	57.3% ±<0.1
Born in another state	14,987 ±982	14.5% ±1.0	15.0% ±0.1	26.9% ±<0.1
Born a citizen outside the states	1,141 ±284	1.1% ±0.3	1.5% ±<0.1	1.7% ±<0.1
Born abroad	37,355 ±1,478	36.2% ±1.4	27.0% ±0.1	14.1% ±<0.1
Naturalized citizens	18,260 ±920	17.7% ±0.9	14.7% ±0.1	7.4% ±<0.1
Not citizens	19,095 ±1,380	18.5% ±1.3	12.3% ±0.1	6.8% ±<0.1

San Mateo city among the places of California

71st of 661 places of 5,000 or more by the survey’s 2020–2024 count. Every one is listed on the California page.

Places of California near San Mateo city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
El Monte city	106,109 ±64
Inglewood city	104,569 ±104
Burbank city	104,546 ±46
El Cajon city	104,449 ±64
Rialto city	104,143 ±77
San Mateo city	103,105 ±92
Vacaville city	102,596 ±51
Chico city	102,188 ±69
Daly City city	101,964 ±54
Hesperia city	100,775 ±44
Norwalk city	99,789 ±84

Elsewhere on the site

Reported crime in San Mateo city, California

Rankings this appears in

No. 4 Places in California by median rent
No. 7 Places by median rent
No. 9 Places in California by median home value
No. 15 Places by median home value
No. 42 Places in California by median household income
No. 49 Places in California by per capita income

Sources

Census Bureau population estimates — incorporated places and New England towns — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Compiled automatically from Census Bureau population estimates — incorporated places and New England towns and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026