Foster City, CA Profile: Facts, Map & Data


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Foster City, California - Basic Facts

The City of Foster City had a population of 33,286 as of July 1, 2017. 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 37.5648 and longitude -122.2508 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.

Beneath the boundary map are tables with Foster City population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Neighborhood Data

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City of Foster City, CA Boundary Map

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Foster City, CA Data & Demographics (As of July 1, 2017)


Total Population 33,286
Population in Households 33,177
Population in Familes 27,786
Population in Group Qrtrs 109
Population Density1 8,769
Diversity Index2 63


Total Households 13,035
Average Household Size 2.55
Family Households 9,101
Average Family Size 3


Total Housing Units 13,500 (100%)
Owner Occupied HU 7,283 (53.9%)
Renter Occupied HU 5,752 (42.6%)
Vacant Housing Units 465 ( 3.4%)
Median Home Value $962,157
Average Home Value $971,817


Median Household Income $121,308
Average Household Income $158,237
Per Capita Income $62,108
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 1.18% 1.02%
Households 1.13% 1.0%
Families 1.1% 0.98%
Median Household Income   1.33%
Per Capita Income   2.1%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

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, 2017 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 # 249 84th
Population Density1 # 88 94th
Diversity Index2 # 767 50th
Median Household Income # 85 94th
Per Capita Income # 119 92nd

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

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