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COUNTY · 1990 CENSUS

San Mateo County

California · 649,623 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 $46,437. Population has declined 8% since 2000. 31% of adults hold a bachelor's degree or higher, well above the national rate of 20%. Median home value is $340,800. Poverty is rare here, at 6.3% of residents. Households here earn about 30% more than the California median.

At a glance
Wealthier
above the US median
US median: $30,130
Older
median age 35.0
US median: 33.0
More educated
31% hold a bachelor's degree
US average: 20%
Stable housing
home values roughly flat, inflation adjusted
US median home: $93,722
Section 01

Population & growth

649,623
−8%vs 2000
vs 707,161 in 2000
1990 – 2025
1,448 / sq mi
−8%vs 2000
vs 1,576 / sq mi in 2000
US average: 221
35.0
−5%vs 2000
vs 36.8 in 2000
US average: 33.0
Population, 19902024
638K673K709K744K779K1990201020202024San Mateo County
2024742K
1990201020202024
Section 02

Income & economy

$46,437
−14%inflation adjusted, since 2000
vs $70,819 in 2000
US average: $30,130
1990 – 2024
$22,430
−38%vs 2000
vs $36,045 in 2000
US average: $14,340
6.3%
+0.5 ptsvs 2000
vs 5.8% in 2000
US average: 13.2%
Section 03

Housing

$340,800
Unchangedinflation adjusted, since 2000
vs $449,900 in 2000
US average: $93,722
1990 – 2024
$769
−11%inflation adjusted, since 2000
vs $1,144 in 2000
US average: $450
60.2%
−1.2 ptsvs 2000
vs 61.4% in 2000
39.8% rent
7.3
+16%vs 2000
vs 6.4 in 2000
1990 – 2024
RELATED:See current rent listings in San Mateo County on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic49.8%(352,355)
Black3.4%(23,778)
Hispanic / Latino21.9%(154,708)
Asian19.8%(140,313)
Other0%
Diversity Score78.3%(553,600)
1990
White, non-Hispanic72%(467,853)
Black5.3%(34,580)
Hispanic / Latino17.4%(113,090)
Asian16.8%(109,309)
Other5.8%(37,881)
Diversity Score72.1%(468,286)
72
−8%vs 2000
vs 78 in 2000
1990 – 2024
Section 05

Education

31.3%
−7.7 ptsvs 2000
vs 39.0% in 2000
US average: 20.3%
High school or higher
84.1%
−1.2 ptsvs 2000
vs 85.3% in 2000
US average: 75.2%
11.1%
−3.5 ptsvs 2000
vs 14.6% in 2000
US average: 7.1%
Section 06

Commute & transportation

23.1 min
+25%vs 2000
vs 18.5 min in 2000
US average: 21.9
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

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Frequently asked

How many people live in San Mateo County, California?

San Mateo County, California has about 649,623 residents according to the 1990 Census.

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

The typical household in San Mateo County, California earns about $46,437 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 $340,800, and the typical rent is about $769 a month.

How educated are people in San Mateo County, California?

About 31.3% 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 6.3% of people in San Mateo County, California live below the federal poverty line.

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

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