topographic

Unincorporated San Mateo County

63,164
Total Population in 2020
In 2020, Unincorporated San Mateo County was home to 63,164 people. Residents were a majority working age. The population was diverse, with no racial group in the majority, and there were more men than women.

Most Populous Demographics

CategoryDemographicTotalPercentage
Age18-6438,62361%
SexFemale31,63750%
Race and Hispanic or LatinoWhite (Not Hispanic or Latino)31,15149%

Age

In 2020, Unincorporated San Mateo County's population was majority working-age adults, while those under age 18 were a moderately larger share than those 65 and older. Looking at 10-year age ranges, 50-59 was the largest group.

Population by Age Range

02.5k5k7.5k10k0-910-1920-2930-3940-4950-5960-6970-7980+11%13%11%12%14%15%13%8%4%
02.5k5k7.5k10k11%13%11%12%14%15%13%8%4%0-910-1920-2930-3940-4950-5960-6970-7980+
/View Population by Age Range dynamic table

Population by Age Group

61%
18-64
    13,250
    Under 18
    38,623
    18-64
    11,291
    65 and over
/View Population by Age Group dynamic table

Table: Population by Age Range

Age RangePopulation in Unincorporated San Mateo County
TotalPercentage
0-96,64411%
10-197,98913%
20-296,70211%
30-397,87312%
40-498,64114%
50-599,62315%
60-698,26913%
70-795,1118%
80+2,3124%

Table: Population by Age Group

Age GroupPopulation in Unincorporated San Mateo County
TotalPercentage
Under 1813,25021%
18-6438,62361%
65 and over11,29118%
* 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. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.

Sex and Age

In 2020, females outnumbered males by a small amount in Unincorporated San Mateo County. Females 50-59 were the largest group by age, followed by males 50-59 and females 40-49. The biggest gap was in the 80-and-older age group, where females were the larger share.

Population by Sex

50%
Female
    31,527
    Male
    31,637
    Female
/View Population by Sex dynamic table

Population by Sex and Age

01.5k3k4.5k6k0-910-1920-2930-3940-4950-5960-6970-7980+3,3834,1193,4724,0374,2284,7034,0962,4571,0323,2613,8703,2303,8364,4134,9204,1732,6541,280
01.5k3k4.5k6k0-910-1920-2930-3940-4950-5960-6970-7980+3,3834,1193,4724,0374,2284,7034,0962,4571,0323,2613,8703,2303,8364,4134,9204,1732,6541,280
6k4.5k3k1.5k01.5k3k4.5k6k0-910-1920-2930-3940-4950-5960-6970-7980+3,3834,1193,4724,0374,2284,7034,0962,4571,0323,2613,8703,2303,8364,4134,9204,1732,6541,280
/View Population by Sex and Age dynamic table
Male
Female

Table: Population by Sex

SexUnincorporated San Mateo County
TotalPercentage
Male31,52750%
Female31,63750%

Table: Population by Sex and Age

Sex and AgeUnincorporated San Mateo County
TotalPercentage
Male31,52750%
Male: 0-93,3835%
Male: 10-194,1197%
Male: 20-293,4726%
Male: 30-394,0376%
Male: 40-494,2287%
Male: 50-594,7037%
Male: 60-694,0966%
Male: 70-792,4574%
Male: 80+1,0322%
Female31,63750%
Female: 0-93,2615%
Female: 10-193,8706%
Female: 20-293,2305%
Female: 30-393,8366%
Female: 40-494,4137%
Female: 50-594,9208%
Female: 60-694,1737%
Female: 70-792,6544%
Female: 80+1,2802%
* 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. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.

Race and Hispanic or Latino

49%
White (Not Hispanic or Latino)
In 2020, Unincorporated San Mateo County had a diverse population with no race/ethnicity being a majority. White and Hispanic people were the largest groups, while Asian and other/multiracial residents were the next biggest segments of the population.

Population by Race and Hispanic or Latino

08k16k24k32kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multiracial*Hispanic or Latino (any race)49%<1%<1%14%<1%6%30%
08k16k24k32kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multiracial*Hispanic or Latino (any race)49%<1%<1%14%<1%6%30%
08k16k24k32kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multiracial*Hispanic or Latino (any race)49%<1%<1%14%<1%6%30%
/View Population by Race and Hispanic or Latino dynamic table

Table: Population by Race and Hispanic or Latino

Race and Hispanic or LatinoPopulation in Unincorporated San Mateo County
TotalPercentage
White31,15149%
Black or African American573<1%
American Indian / Alaska Native77<1%
Asian8,67114%
Native Hawaiian / Pacific Islander299<1%
Other / Multiracial3,6806%
Hispanic or Latino (any race)18,71330%
* 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 2020, Demographic and Housing Characteristics File (DHC), P5 Hispanic or Latino Origin by Race. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.