San Mateo County, California Population 2021

San Mateo County, California's estimated population is 762,357 with a growth rate of -0.28% in the past year according to the most recent United States census data. San Mateo County, California is the 15th largest county in California. The 2010 Population was 719,699 and has seen a growth of 5.93% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
2021762,357-2,108-0.28%
2020764,465-2,108-0.27%
2019766,573-2,108-0.27%
2018768,681-220-0.03%
2017768,9019950.13%
2016767,9062,8510.37%
2015765,0557,8511.04%
2014757,2048,5431.14%
2013748,6619,4371.28%
2012739,22410,8801.49%
2011728,3448,6451.20%
2010719,69970,07610.79%
1990649,62362,29410.61%
1980587,32931,0955.59%
1970556,234111,84725.17%
1960444,387208,72888.57%
1950235,659123,877110.82%
1940111,78234,37744.41%
193077,40540,624110.45%
192036,78110,19638.35%
191026,58514,491119.82%
190012,0942,00719.90%
189010,0871,41816.36%
18808,6692,03430.66%
18706,6353,421106.44%
18603,2140.00%
2021 Growth Rate
-0.28%
County Website
County Seat
2010 Population
719,699
Growth Since 2010
5.93%
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San Mateo County, California Population Growth

Population by Race

Race Population Percentage
White388,31850.60%
Asian220,15128.69%
Some Other Race84,31010.99%
Two or More Races43,4925.67%
Black or African American17,7842.32%
Native Hawaiian and Other Pacific Islander10,3661.35%
American Indian and Alaska Native3,0020.39%
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San Mateo County, California Population by Race

San Mateo County, California Population Pyramid $2021

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San Mateo County, California Median Age

39.7


Total

38.4


Male

41.1


Female

San Mateo County, California Adults

There are 607,919 adults, (120,877 of whom are seniors) in San Mateo County, California.

San Mateo County, California Age Dependency

57.6

Age Dependency Ratio

24.8

Old Age Dependency Ratio

32.7

Child Dependency Ratio

San Mateo County, California Sex Ratio

Female

388,095

50.57%

Male

379,328

49.43%

San Mateo County, California Population by Age

San Mateo County, California Renter vs Owner Occupied by Household Type

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San Mateo County, California Household Types

Type Owner Renter
Married70.5%29.5%
All60.2%39.8%
Female50.2%49.8%
Male48.7%51.3%
Non Family46.3%53.7%

60.2%

Rate of Home Ownership

San Mateo County, California Households and Families

Type Count Average Size Owned
All263,5432.8760.2
Married145,3443.4670.5
Non Family78,9151.4246.3
Female26,5693.6350.2
Male12,7153.6248.7

3.36

Average Family Size

2.87

Average Household Size

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San Mateo County, California Households by Type

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Education Attained Count Percentage
Less Than 9th Grade34,2976.22%
9th to 12th Grade23,0894.19%
High School Graduate81,90914.86%
Some College92,19216.72%
Associates Degree38,7547.03%
Bachelors Degree159,60728.95%
Graduate Degree121,44222.03%
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San Mateo County, California Educational Attainment by Sex (over 25)

San Mateo County, California Educational Attainment by Race

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Race Total High School Bachelors
White233,489226,378141,112
Asian169,100156,166102,084
Hispanic115,01980,39324,882
Other Race52,22033,5598,639
2+ Races18,43617,1469,221
Black13,61112,3713,868
Islander6,4985,6971,399
Native American2,1561,560438

The highest rate of high school graduation is among white people with a rate of 96.95%.

The highest rate of bachelors degrees is among white people with a rate of 60.44%.

San Mateo County, California Educational Attainment by Race

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Name Average Male Female
Overall$62,386$71,013$54,094
Less Than 9th Grade$27,674$31,227$22,561
High School Graduate$36,747$41,533$30,879
Some College$47,888$53,138$41,851
Bachelors Degree$79,080$93,635$67,254
Graduate Degree$120,894$146,681$97,155

$62,386

Average Earnings

$71,013

Average Male

$54,094

Average Female

San Mateo County, California Earnings by Educational Attainment

San Mateo County, California Language by Age

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San Mateo County, California Language

54.29% of San Mateo County, California residents speak only English, while 45.71% speak other languages. The non-English language spoken by the largest group is Asian and Pacific Island languages, which is spoken by 19.37% of the population.

San Mateo County, California Language

San Mateo County, California Poverty by Race

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Name Total In Poverty Poverty Rate
Hispanic185,05720,95711.32%
White298,88014,6274.89%
Asian219,17710,7264.89%
Other83,25710,67312.82%
Multiple43,0342,7836.47%
Black17,3211,95711.30%
Islander10,2891,15911.26%
Native2,95169523.55%

6.71%

Overall Poverty Rate

6.11%

Male Poverty Rate

7.30%

Female Poverty Rate

Poverty in San Mateo County, California

The race most likely to be in poverty in San Mateo County, California is Native, with 23.55% below the poverty level.

The race least likely to be in poverty in San Mateo County, California is Asian, with 4.89% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.29%. Among those working part-time, it was 8.61%, and for those that did not work, the poverty rate was 13.76%.

San Mateo County, California Poverty

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Name Poverty
Less Than 9th Grade14.81%
High School9.13%
Some College6.22%
Bachelors or Greater3.05%

San Mateo County, California Poverty Rate by Education

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Rate Poverty
Female Unemployed19.72%
Male Unemployed16.35%
Female Employed3.45%
Male Employed3.01%

San Mateo County, California Poverty Rate by Employment Status and Sex

San Mateo County, California Income by Household Type

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Name Median Mean
Households$122,641$174,055
Families$141,881$196,828
Married Families$165,660$221,880
Non Families$76,096$110,180
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Income by Household Type

San Mateo County, California Marital Status

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Marriage Rates

52.7%

Overall Marriage Rate

54.3%

Male Marriage Rate

51.0%

Female Marriage Rate

San Mateo County, California Married by Age and Sex

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San Mateo County, California Marriage

The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 35-44.

San Mateo County, California Marital Status by Race

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San Mateo County, California Marital Status

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25,027

Number of Veterans

23,302

Male Veterans

1,725

Female Veterans

War Veterans
Vietnam8,677
Second Gulf War3,726
First Gulf War3,223
Korea2,938
World War II1,486

San Mateo County, California Veterans by War

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Age Group Veterans
75+8,358
65 to 746,297
35 to 544,836
55 to 643,707
18 to 341,829

San Mateo County, California Veterans by Age

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Name Veterans % of Total
White18,0165.73%
Asian3,3571.83%
Hispanic3,0162.24%
Black1,62210.77%
2+ Races7983.52%
Other Race7721.25%
Islander2613.41%
Native American2018.15%

San Mateo County, California Veterans by Race

San Mateo County, California Veterans by Education

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5.48%

Veteran Poverty Rate

27.33%

Veteran Disability Rate

San Mateo County, California Veterans by Education

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68.9%

Labor Force Participation

66.3%

Employment Rate

3.7%

Unemployment Rate

San Mateo County, California Employment by Age

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San Mateo County, California Employment by Race

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San Mateo County, California Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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48.07%

Born in San Mateo County, California

65.15%

Native Born

34.85%

Foreign Born

14.78%

Non Citizen

20.06%

Naturalized

Place of Birth

65.15% of San Mateo County, California residents were born in the United States, with 48.07% having been born in California. 14.78% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

San Mateo County, California Place of Birth

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources