Foster City

County:: San Mateo County
County Seat:: No
Area (mi²):: 3.787
State:: California

Foster City is a city located in San Mateo County, California. Foster City has a 2025 population of 31,144. Foster City is currently declining at a rate of -1.64% annually and its population has decreased by -7.67% since the most recent census, which recorded a population of 33,733 in 2020.

The average household income in Foster City is $241,557 with a poverty rate of 4.64%. The median age in Foster City is 39.7 years: 38.7 years for males, and 41.1 years for females.

Demographics

The racial composition of Foster City includes 53.93% Asian, 32.96% White, and smaller percentages for other race, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Asian

White

Two or more races

Other race

Black or African American

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
Asian	17,776	53.93%
White	10,865	32.96%
Two or more races	2,938	8.91%
Other race	764	2.32%
Black or African American	504	1.53%
Native American	71	0.22%
Native Hawaiian or Pacific Islander	46	0.14%

Foster City Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Foster City's average per capita income is $131,313. Household income levels show a median of $193,633. The poverty rate stands at 4.64%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$249,253	-
Families	$227,959	$276,586
Households	$193,633	$241,557
Non Families	$127,917	$159,500

$131,313

Average Income

$193,633

Median Household Income

4.64%

Poverty Rate