San Mateo County

718,451

Total Population in 2010

In 2010, San Mateo County was home to 718,451 people. Residents were predominantly working age, while those under 18 were a larger segment of the county than those 65 and older. The population was diverse, with no racial group in the majority.

Most Populous Demographics

Category	Demographic	Total	Percentage
Age	18-64	462,417	64%
Sex	Female	365,283	51%
Race and Hispanic or Latino	White (Not Hispanic or Latino)	303,609	42%

Age

39.3

Median Age

In 2010, San Mateo County's population was a majority working-age adults, while those under age 18 were a moderately larger share of the county than those 65 and older. Looking at 10-year age ranges, 40-49 was the largest group.

Population by Age Range

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Population by Age Group

159,772

Under 18

462,417

18-64

96,262

65 and over

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Table: Population by Age Range

Age Range	Population in San Mateo County
Age Range	Total	Percentage
0-9	91,089	13%
10-19	83,712	12%
20-29	88,418	12%
30-39	104,372	15%
40-49	111,166	15%
50-59	102,110	14%
60-69	69,807	10%
70-79	38,388	5%
80+	29,389	4%

Table: Population by Age Group

Age Group	Population in San Mateo County
Age Group	Total	Percentage
Under 18	159,772	22%
18-64	462,417	64%
65 and over	96,262	13%

* For both charts above, the data is collected from the U.S. Census Bureau Decennial Data 2010, Summary File 1 (SF1), P12 Sex by Age.

Sex and Age

In 2010, females outnumbered males by a moderate amount in San Mateo County. Females 40-49 were the largest group by age, followed by males 40-49 and males 30-39. The biggest gap was in the 80-and-older age group, where females were the larger share.

Population by Sex

353,168

Male

365,283

Female

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Population by Sex and Age

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Male

Female

Table: Population by Sex

Sex	San Mateo County
Sex	Total	Percentage
Male	353,168	49%
Female	365,283	51%

Table: Population by Sex and Age

Sex and Age	San Mateo County
Sex and Age	Total	Percentage
Male	353,168	49%
Male: 0-9	46,472	6%
Male: 10-19	43,096	6%
Male: 20-29	46,062	6%
Male: 30-39	52,534	7%
Male: 40-49	54,644	8%
Male: 50-59	49,796	7%
Male: 60-69	32,696	5%
Male: 70-79	16,987	2%
Male: 80+	10,881	2%
Female	365,283	51%
Female: 0-9	44,617	6%
Female: 10-19	40,616	6%
Female: 20-29	42,356	6%
Female: 30-39	51,838	7%
Female: 40-49	56,522	8%
Female: 50-59	52,314	7%
Female: 60-69	37,111	5%
Female: 70-79	21,401	3%
Female: 80+	18,508	3%

* For both charts above, the data is collected from the U.S. Census Bureau Decennial Data 2010, Summary File 1 (SF1), P12 Sex by Age.

Race and Hispanic or Latino

42%

White (Not Hispanic or Latino)

In 2010, San Mateo County had a diverse population with no race/ethnicity being a majority. White and Hispanic people were the largest groups in the county, while Asian and other/multiracial residents were the next biggest segments of the population.

Population by Race and Hispanic or Latino

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Table: Population by Race and Hispanic or Latino

Race and Hispanic or Latino	Population in San Mateo County
Race and Hispanic or Latino	Total	Percentage
White	303,609	42%
Black or African American	18,763	3%
American Indian / Alaska Native	1,125	<1%
Asian	175,934	24%
Native Hawaiian / Pacific Islander	9,884	1%
Other / Multiracial	26,634	4%
Hispanic or Latino (any race)	182,502	25%

* Categorized as Not Hispanic. This means that all the racial groups marked with an asterisk — White, Black or African American, American Indian / Alaska Native, Asian, Native Hawaiian / Pacific Islander, and Other / Multiracial — do not include individuals who identify as Hispanic or Latino. The "Hispanic or Latino (any race)" category is separate, as Hispanic/Latino is considered an ethnicity rather than a racial category. For the chart above, the data is collected from the U.S. Census Bureau Decennial Data 2010, Summary File 1 (SF1), P5 Hispanic or Latino Origin by Race.