topographic

Unincorporated San Mateo County

21,630
Total Households in 2020
In 2020, two-person households were the most common size in Unincorporated San Mateo County, followed by one-person households. Married-couple households made up the largest share of household types. Additionally, 70% of households were owner-occupied.

Most Populous Demographics

CategoryDemographicTotalPercentage
CompositionMarried couple12,76459%
TenureOwner15,19870%
Size2 persons7,03133%

Composition

59%
Married couple
Married-couple households were the largest type in Unincorporated San Mateo County for 2020. Non-family households outnumbered single-parent households by a significant amount. The vast majority of single-parent households were led by women, and more women than men lived alone.

Households by Type

03.5k7k10.5k14kMarried coupleSingle parentNon-family59%15%26%
03.5k7k10.5k14k59%15%26%Married coupleSingle parentNon-family
/View Households by Type dynamic table

Households by Marital Status

59%
Married couple
    12,764
    Married couple
    8,866
    Single
/View Households by Marital Status dynamic table

Householder Type by Sex

00.6k1.2k1.8k2.4k35%46%54%65%54%46%
Single parentLiving aloneNot living alone35%46%54%MaleMaleMale65%54%46%FemaleFemaleFemale
/View Householder Type by Sex dynamic table

Table: Households by Type

TypeHouseholds in Unincorporated San Mateo County
TotalPercentage
Married couple12,76459%
Single parent3,26315%
Non-family5,60326%

Table: Households by Marital Status

Marital StatusHouseholds in Unincorporated San Mateo County
TotalPercentage
Married couple12,76459%
Single8,86641%

Table: Householder Type by Sex

Type by SexHouseholds in Unincorporated San Mateo County
TotalPercentage
Single parent - male1,12713%
Single parent - female2,13624%
Living alone - male1,87221%
Living alone - female2,21425%
Not living alone - male8139%
Not living alone - female7048%
* For all three charts above, the data is collected from the U.S. Census Bureau Decennial Data 2020, Demographic and Housing Characteristics File (DHC), H14 Tenure By Household Type by Age of Householder. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.

Tenure

70%
Owner
Owner-occupied households accounted for 70% of Unincorporated San Mateo County’s 21,630 households in 2020. The remaining households were renter-occupied.

Households by Tenure

70%
Owner
    15,198
    Owner
    6,432
    Renter
/View Households by Tenure dynamic table

Table: Households by Tenure

TenureHouseholds in Unincorporated San Mateo County
TotalPercentage
Owner15,19870%
Renter6,43230%
* For the chart above, the data is collected from the U.S. Census Bureau Decennial Data 2020, Demographic and Housing Characteristics File (DHC), H14 Tenure By Household Type by Age of Householder. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.

Size

33%
2 persons
Two-person households were the most common for Unincorporated San Mateo County in 2020, while one-person households also represented a notable share. Four-person households were next in the rankings, followed by three-person households as the fourth most common.

Households by Size

02k4k6k8k1 person2 persons3 persons4 persons5 persons6 persons7+ persons19%33%18%18%8%3%2%
02k4k6k8k19%33%18%18%8%3%2%1 person2 persons3 persons4 persons5 persons6 persons7+ persons
/View Households by Size dynamic table

Table: Households by Size

SizeHouseholds in Unincorporated San Mateo County
TotalPercentage
1 person4,08619%
2 persons7,03133%
3 persons3,87418%
4 persons3,88218%
5 persons1,6668%
6 persons5843%
7+ persons5072%
* For the chart above, the data is collected from the U.S. Census Bureau Decennial Data 2020, Demographic and Housing Characteristics File (DHC), H9 Household Size. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.