San Mateo Population

1880–2026

102.63K

2026 projection

2.9% since 2020 (decrease)

020K40K60K80K100K120K18801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for San Mateo. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026102,633-7040.68%
2025103,337+4810.47%
2024102,856+7780.76%
2023102,078+1260.12%
2022101,952-9920.96%
2021102,944-2,7252.58%
2020105,669+2,2062.13%
2019103,463-7670.74%
2018104,230+540.05%
2017104,176+2820.27%

Showing 10 of 29 years.

San Mateo Demographics

38.3median age

Median age

Female40.2 yrs
Male36.4 yrs

Adults

82,894
17,563 seniors · 21%65,331 other adults

Sex

Female 50.5% · 52,019Male 49.5% · 51,086

Population by age

MaleFemale85+ years, male: 1,10185+ years, female: 1,89080–84 years, male: 1,05080–84 years, female: 1,58775–79 years, male: 1,05575–79 years, female: 1,97170–74 years, male: 1,55870–74 years, female: 2,22865–69 years, male: 2,44465–69 years, female: 2,67960–64 years, male: 2,77660–64 years, female: 2,89355–59 years, male: 2,75855–59 years, female: 2,92450–54 years, male: 3,13850–54 years, female: 3,03945–49 years, male: 3,50245–49 years, female: 3,25840–44 years, male: 3,24340–44 years, female: 3,73235–39 years, male: 4,40635–39 years, female: 4,41330–34 years, male: 5,39230–34 years, female: 4,49025–29 years, male: 4,27525–29 years, female: 3,75420–24 years, male: 3,00620–24 years, female: 2,77115–19 years, male: 2,36915–19 years, female: 2,44810–14 years, male: 3,30410–14 years, female: 2,5675–9 years, male: 2,4025–9 years, female: 2,5830–4 years, male: 3,3070–4 years, female: 2,79285+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–42K2K4K4K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 1,031 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

San Mateo Income

$153,504median household income

Median household income

$153,504

Half of households earn more, half earn less

Median earnings

$97,506

Typical yearly pay for a worker 25 or older.

Poverty rate

8.2%

About 1 in 12 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

San Mateo Marital Status

49% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married49%51%47%
Never married36%39%33%
Divorced8%7%10%
Widowed5%2%8%
Separated2%1%2%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

10 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year