Foster City, CA Profile: Facts & Data


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Foster City, California - Basic Facts

The City of Foster City had a population of 33,396 as of July 1, 2018. Foster City ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in California. See peer rankings below.

The primary coordinate point for Foster City is located at latitude 37.5585 and longitude -122.2711 in San Mateo County. The formal boundaries for the City of Foster City (see map below) encompass a land area of 3.8 sq. miles and a water area of 16.05 sq. miles. San Mateo County is in the Pacific time zone (GMT -8). The elevation is 7 feet.

The City of Foster City (GNIS ID: 2410534) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

California is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of Foster City is located within San Mateo CCD of San Mateo County.

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  1. Foster City 2018 Demographic Data
  2. Growth Rates for Foster City (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. California Research Tools (Easy Tools & Current Data)
  3. California Data Comparison Tool - 2018 Demographics

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Boundary Maps, Demographic Data, School Zones Review maps and data for the neighborhood, city, county, ZIP Code, and school zone. July 1, 2018, data includes home values, household income, percentage of homes owned, rented or vacant, etc.


Foster City, CA Data & Demographics (As of July 1, 2018)


Total Population 33,396
Population in Households 33,289
Population in Familes 28,039
Population in Group Qrtrs 107
Population Density2 8,798
Diversity Index3 63


Median Household Income $129,557
Average Household Income $166,513
Per Capita Income $65,455


Total Housing Units 13,510 (100%)
Owner Occupied HU 7,414 (54.9%)
Renter Occupied HU 5,686 (42.1%)
Vacant Housing Units 410 ( 3.0%)
Median Home Value $1,098,261
Average Home Value $1,143,509


Total Households 13,100
Average Household Size 2.54
Family Households 9,140
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2018 2018-2023
Population 1.08% 0.79%
Households 1.05% 0.78%
Families 1.02% 0.76%
Median Household Income   2.58%
Per Capita Income   2.67%

Foster City, CA - Peer Comparisons by Rank and Percentile

The table below compares Foster City to the other 1,516 incorporated cities, towns and CDPs in California by rank and percentile using July 1, 2018 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 248 84th
Population Density # 87 94th
Diversity Index # 789 48th
Median Household Income # 84 95th
Per Capita Income # 117 92nd

Additional comparisons and rankings can be made with a VERY EASY TO USE California Census Data Comparison Tool.

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