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 32,657. Foster City is currently growing at a rate of 0.66% annually but its population has decreased by -3.2% since the most recent census, which recorded a population of 33,737 in 2020.

32.7K
Total Population
8,623
Density (mi²)
215 0.66%
Growth

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)