San Mateo County

707,161

Total Population in 2000

In 2000, San Mateo County was home to 707,161 people. Residents were predominantly working age, while those under 18 were a much larger segment of the county than those 65 and older. The population was a majority white, with more women than men.

Most Populous Demographics

Category	Demographic	Total	Percentage
Age	18-64	456,976	65%
Sex	Female	357,510	51%
Race and Hispanic or Latino	White (Not Hispanic or Latino)	352,355	50%

Age

36.8

Median Age

In 2000, San Mateo County's population was predominantly working-age adults, while those under age 18 were a considerably larger share of the county than those 65 and older. Looking at 10-year age ranges, 30-39 was the largest group.

Population by Age Range

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Population by Age Group

162,100

Under 18

456,976

18-64

88,085

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	92,304	13%
10-19	84,982	12%
20-29	93,402	13%
30-39	122,726	17%
40-49	113,295	16%
50-59	84,466	12%
60-69	50,852	7%
70-79	41,166	6%
80+	23,968	3%

Table: Population by Age Group

Age Group	Population in San Mateo County
Age Group	Total	Percentage
Under 18	162,100	23%
18-64	456,976	65%
65 and over	88,085	12%

* For both charts above, the data is collected from the U.S. Census Bureau Decennial Data 2000, Summary File 1 (SF1), P012 Sex by Age.

Sex and Age

In 2000, females outnumbered males by a moderate amount in San Mateo County. Males 30-39 were the largest group by age, followed by females 30-39 and females 40-49. The biggest gap was in the 80-and-older age group, where females were the larger share.

Population by Sex

349,651

Male

357,510

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	349,651	49%
Female	357,510	51%

Table: Population by Sex and Age

Sex and Age	San Mateo County
Sex and Age	Total	Percentage
Male	349,651	49%
Male: 0-9	47,186	7%
Male: 10-19	44,255	6%
Male: 20-29	49,008	7%
Male: 30-39	62,239	9%
Male: 40-49	56,436	8%
Male: 50-59	40,824	6%
Male: 60-69	23,758	3%
Male: 70-79	17,543	2%
Male: 80+	8,402	1%
Female	357,510	51%
Female: 0-9	45,118	6%
Female: 10-19	40,727	6%
Female: 20-29	44,394	6%
Female: 30-39	60,487	9%
Female: 40-49	56,859	8%
Female: 50-59	43,642	6%
Female: 60-69	27,094	4%
Female: 70-79	23,623	3%
Female: 80+	15,566	2%

* For both charts above, the data is collected from the U.S. Census Bureau Decennial Data 2000, Summary File 1 (SF1), P012 Sex by Age.

Race and Hispanic or Latino

50%

White (Not Hispanic or Latino)

In 2000, San Mateo County had a majority white population. Hispanic residents also made up a significant segment of the community, while Asian and other/multiracial people were the next largest groups.

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	352,355	50%
Black or African American	23,778	3%
American Indian / Alaska Native	1,546	<1%
Asian	140,313	20%
Native Hawaiian / Pacific Islander	9,112	1%
Other / Multi-racial	25,349	4%
Hispanic or Latino (any race)	154,708	22%

* 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 / Multi-racial — 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 2000, Summary File 1 (SF1), P008 Hispanic or Latino by Race.