Population
Population
topographic
Population

San Mateo

105,661
Total Population in 2020
In 2020, San Mateo was home to 105,661 people. Residents were predominantly working age, while those under 18 were a larger segment of the community than those 65 and older. The population was diverse, with no racial group in the majority.

Most Populous Demographics

CategoryDemographicTotalPercentage
Age18-6468,33565%
SexFemale53,45551%
Race and Hispanic or LatinoWhite (Not Hispanic or Latino)40,51938%

Age

38.3
Median Age
In 2020, San Mateo's population was predominantly working-age adults, while those under age 18 were a moderately larger share of the community than those 65 and older. Looking at 10-year age ranges, 30-39 was the largest group.

Population by Age Range

05k10k15k20k0-910-1920-2930-3940-4950-5960-6970-7980+11%11%13%18%14%13%10%7%4%
05k10k15k20k11%11%13%18%14%13%10%7%4%0-910-1920-2930-3940-4950-5960-6970-7980+
/View Population by Age Range dynamic table

Population by Age Group

65%18-64
    20,902
    Under 18
    68,335
    18-64
    16,424
    65 and over
/View Population by Age Group dynamic table

Table: Population by Age Range

Age RangePopulation in San Mateo
TotalPercentage
0-911,80811%
10-1911,09311%
20-2913,94913%
30-3918,81618%
40-4914,51614%
50-5913,28913%
60-6910,61610%
70-796,9527%
80+4,6224%

Table: Population by Age Group

Age GroupPopulation in San Mateo
TotalPercentage
Under 1820,90220%
18-6468,33565%
65 and over16,42416%
* For both charts above, the data is collected from the U.S. Census Bureau Decennial Data 2020, Demographic and Housing Characteristics File (DHC), P12 Sex by Age for Selected Age Categories.

Sex and Age

In 2020, females outnumbered males by a moderate amount in San Mateo. 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

51%Female
    52,206
    Male
    53,455
    Female
/View Population by Sex dynamic table

Population by Sex and Age

02.5k5k7.5k10k0-910-1920-2930-3940-4950-5960-6970-7980+6,1225,7577,2359,7017,1966,4855,0342,9821,6945,6865,3366,7149,1157,3206,8045,5823,9702,928
02.5k5k7.5k10k0-910-1920-2930-3940-4950-5960-6970-7980+6,1225,7577,2359,7017,1966,4855,0342,9821,6945,6865,3366,7149,1157,3206,8045,5823,9702,928
10k7.5k5k2.5k02.5k5k7.5k10k0-910-1920-2930-3940-4950-5960-6970-7980+6,1225,7577,2359,7017,1966,4855,0342,9821,6945,6865,3366,7149,1157,3206,8045,5823,9702,928
/View Population by Sex and Age dynamic table
Male
Female

Table: Population by Sex

SexSan Mateo
TotalPercentage
Male52,20649%
Female53,45551%

Table: Population by Sex and Age

Sex and AgeSan Mateo
TotalPercentage
Male52,20649%
Male: 0-96,1226%
Male: 10-195,7575%
Male: 20-297,2357%
Male: 30-399,7019%
Male: 40-497,1967%
Male: 50-596,4856%
Male: 60-695,0345%
Male: 70-792,9823%
Male: 80+1,6942%
Female53,45551%
Female: 0-95,6865%
Female: 10-195,3365%
Female: 20-296,7146%
Female: 30-399,1159%
Female: 40-497,3207%
Female: 50-596,8046%
Female: 60-695,5825%
Female: 70-793,9704%
Female: 80+2,9283%
* For both charts above, the data is collected from the U.S. Census Bureau Decennial Data 2020, Demographic and Housing Characteristics File (DHC), P12 Sex by Age for Selected Age Categories.

Race and Hispanic or Latino

38%
White (Not Hispanic or Latino)
In 2020, San Mateo had a diverse population with no race/ethnicity being a majority. White and Asian people were the largest groups in the community, while Hispanic and other/multiracial residents were the next biggest segments of the population.

Population by Race and Hispanic or Latino

015k30k45k60kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multi-racial*Hispanic or Latino (any race)38%2%<1%26%2%6%26%
015k30k45k60kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multi-racial*Hispanic or Latino (any race)38%2%<1%26%2%6%26%
015k30k45k60kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multi-racial*Hispanic or Latino (any race)38%2%<1%26%2%6%26%
/View Population by Race and Hispanic or Latino dynamic table

Table: Population by Race and Hispanic or Latino

Race and Hispanic or LatinoPopulation in San Mateo
TotalPercentage
White40,51938%
Black or African American1,6962%
American Indian / Alaska Native177<1%
Asian27,78626%
Native Hawaiian / Pacific Islander1,6342%
Other / Multi-racial6,6516%
Hispanic or Latino (any race)27,19826%
* 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 2020, Demographic and Housing Characteristics File (DHC), P5 Hispanic or Latino Origin by Race.