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 2026 population of 32,117. Foster City is currently declining at a rate of -0.83% annually and its population has decreased by -4.8% since the most recent census, which recorded a population of 33,737 in 2020.

The median household income in Foster City is $199,143 with a poverty rate of 4.1%. The median age in Foster City is 39.5 years: 38.9 years for males, and 40.7 years for females. For every 100 females there are 91.5 males.

32.1K
Total Population
8,480
Density (mi²)
-270 -0.83%
Growth

Foster City Population

Foster City Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202632,117-270-0.83%
202532,387-270-0.83%
202432,6572150.66%
202332,442-11-0.03%
202232,453-289-0.88%
202132,742-995-2.95%
202033,737-72-0.21%
201933,272500.15%
201833,2222600.79%
201732,962550.17%
201632,907660.2%
201532,8411990.61%
201432,6426341.98%
201332,0087052.25%
201231,3034061.31%
201130,8973000.98%
201030,597300.1%
200028,8036272.23%
199028,1764,88920.99%
198023,28713,765144.56%
19709,52200%

Median Age

Overall: 39.5 years
Female: 40.7 years
Male: 38.9 years

Foster City Adults

There are 25,515 adults, (5,759 of whom are seniors) in Foster City.

Sex Ratio

Female: 17,124 (52.2%)
Male: 15,668 (47.8%)

Demographics

The racial composition of Foster City includes 54.4% Asian, 30.01% White, 3.48% other race, and smaller percentages for Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
Asian17,83854.4%
White9,84130.01%
Two or more races3,2759.99%
Other race1,1413.48%
Black or African American5521.68%
Native American1010.31%
Native Hawaiian or Pacific Islander440.13%
Race
Population ↓
Percentage (of total)
Two or more races1,2063.68%
Other race6932.11%
White3651.11%
Black or African American300.09%
Native American230.07%
Asian220.07%
Race
Population ↓
Percentage (of total)
Asian17,81654.33%
White9,47628.9%
Two or more races2,0696.31%
Black or African American5221.59%
Other race4481.37%
Native American780.24%
Native Hawaiian or Pacific Islander440.13%

Foster City Marital Status

Economics and Income Statistics

Foster City 's average per capita income is $132,835. Household income levels show a median of $199,143. The poverty rate stands at 4.1%.

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$250,001-
Families$234,645$288,853
Households$199,143$246,457
Non Families$125,057$156,250

$132,835

Average Income

$199,143

Median Household Income

4.1%

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)