Foster City is a city located in California. With a 2020 population of 34,141, it is the 226th largest city in California and the 1147th largest city in the United States. Foster City is currently declining at a rate of -0.01% annually but its population has increased by 11.69% since the most recent census, which recorded a population of 30,567 in 2010. Foster City reached it's highest population of 34,297 in 2016. Spanning over 20 miles, Foster City has a population density of 8,994 people per square mile.
The average household income in Foster City is $177,868 with a poverty rate of 3.57%. The median rental costs in recent years comes to $3,002 per month, and the median house value is $1.15 Mn. The median age in Foster City is 40.1 years, 38.5 years for males, and 41.4 years for females. For every 100 females there are 99.8 males.