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COUNTY · 2000 CENSUS

San Mateo County

California · 707,161 residents · 448.606 sq mi
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The short version

San Mateo County is significantly wealthier than the US average, with a median household income of $70,819. Population has held roughly steady since 1990. 39% of adults hold a bachelor's degree or higher, well above the national rate of 24%. Median home value is $449,900. Poverty is rare here, at 5.8% of residents. Households here earn about 49% more than the California median.

At a glance
Wealthier
above the US median
US median: $42,589
Mid-age
median age 36.8
US median: 35.2
More educated
39% hold a bachelor's degree
US average: 24%
Stable housing
home values roughly flat, inflation adjusted
US median home: $120,530
Section 01

Population & growth

Total population
707,161
+9%since 1990
from 649,623 in 1990
1990 – 2025
Population density
1,576 / sq mi
+9%since 1990
from 1,448 / sq mi in 1990
US average: 242
Median age
36.8
+5%since 1990
from 35.0 in 1990
US average: 35.2
Population, 1990 – 2024
638K673K709K744K779K1990201020202024San Mateo County
2024742K
1990201020202024
Section 02

Income & economy

Median household income
$70,819
+16%inflation adjusted, since 1990
from $46,437 in 1990
US average: $42,589
1990 – 2024
Per capita income
$36,045
+61%since 1990
from $22,430 in 1990
US average: $21,522
Poverty rate
5.8%
−0.5 ptssince 1990
from 6.3% in 1990
US average: 12.4%
Section 03

Housing

Median home value
$449,900
Unchangedinflation adjusted, since 1990
from $340,800 in 1990
US average: $120,530
1990 – 2024
Median gross rent
$1,144
+13%inflation adjusted, since 1990
from $769 in 1990
US average: $602
Owner-occupied
61.4%
+1.2 ptssince 1990
from 60.2% in 1990
38.6% rent
Afford Score
6.4
−13%since 1990
from 7.3 in 1990
1990 – 2024
RELATED:See current rent listings in San Mateo County on RentDataNow
Section 04

Race & ethnicity

1990
White, non-Hispanic72%(467,853)
Black5.3%(34,580)
Hispanic / Latino17.4%(113,090)
Asian16.8%(109,309)
Diversity Score72.1%(468,286)
2000
White, non-Hispanic49.8%(352,355)
Black3.4%(23,778)
Hispanic / Latino21.9%(154,708)
Asian19.8%(140,313)
Diversity Score78.3%(553,600)
Diversity Score
78
+9%since 1990
from 72 in 1990
1990 – 2024
Section 05

Education

Bachelor's degree or higher
39.0%
+7.7 ptssince 1990
from 31.3% in 1990
US average: 24.4%
High school or higher
85.3%
+1.2 ptssince 1990
from 84.1% in 1990
US average: 80.3%
Graduate degree
14.6%
+3.5 ptssince 1990
from 11.1% in 1990
US average: 8.8%
Section 06

Commute & transportation

Average commute
18.5 min
−20%since 1990
from 23.1 min in 1990
US average: 17.6
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

Drill deeper

Places similar to San Mateo County

San Francisco County
Pop 826,079
Norfolk County
Pop 739,749
Fairfax County
Pop 1,167,873
Western Connecticut Planning Region
Pop 640,482
Places similar to San Mateo County
Head to head

Compare San Mateo County to nearby counties

SAN MATEO COUNTY VS
Alameda County
Income$129,367+83%
Home value$1,090,100+142%
Population1,636,630+120%
SEE FULL COMPARISON →
SAN MATEO COUNTY VS
Santa Cruz County
Income$111,093+57%
Home value$1,027,500+128%
Population258,852−65%
SEE FULL COMPARISON →
SAN MATEO COUNTY VS
Santa Clara County
Income$164,281+132%
Home value$1,490,600+231%
Population1,914,391+157%
SEE FULL COMPARISON →
SAN MATEO COUNTY VS
Contra Costa County
Income$127,229+80%
Home value$866,800+93%
Population1,170,070+57%
SEE FULL COMPARISON →
Frequently asked

How many people live in San Mateo County, California?

San Mateo County, California has about 707,161 residents according to the 2000 Census.

What is the median household income in San Mateo County, California?

The typical household in San Mateo County, California earns about $70,819 a year. Half of households make more than that, and half make less.

Is San Mateo County, California expensive?

In San Mateo County, California, the median home is worth about $449,900, and the typical rent is about $1,144 a month.

How educated are people in San Mateo County, California?

About 39.0% of adults age 25 and over in San Mateo County, California hold a bachelor's degree or higher.

What is the poverty rate in San Mateo County, California?

About 5.8% of people in San Mateo County, California live below the federal poverty line.

Has San Mateo County, California grown since 1990?

Yes, San Mateo County, California has grown since 1990. The population has added about 57,538 residents, a change of about 9 percent over that period.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

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