Foster City Flag

Foster City

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.

31.1K
Total Population
8,224
Density (mi²)
-518 -1.64%
Growth

Foster City Population

Foster City Population

Data after 2023 is projected based on recent change

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

Race
Population
Percentage (of total)
Asian17,77653.93%
White10,86532.96%
Two or more races2,9388.91%
Other race7642.32%
Black or African American5041.53%
Native American710.22%
Native Hawaiian or Pacific Islander460.14%

Foster City Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

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

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)