San Mateo, CA Profile: Facts, Map & Data


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San Mateo, California - Basic Facts

The City of San Mateo had a population of 103,979 as of July 1, 2017. San Mateo 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 San Mateo is located at latitude 37.5603 and longitude -122.3106 in San Mateo County. The formal boundaries for the City of San Mateo (see map below) encompass a land area of 12.13 sq. miles and a water area of 3.75 sq. miles. San Mateo County is in the Pacific time zone (GMT -8). The elevation is 46 feet.

The City of San Mateo (GNIS ID: 2411800) 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 San Mateo is located within San Mateo CCD of San Mateo County.

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

Alternate Unofficial Names for San Mateo: San Matheo.

Neighborhood Data

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City of San Mateo, CA Boundary Map

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San Mateo, CA Data & Demographics (As of July 1, 2017)


Total Population 103,979
Daytime Population: Workers 65,679
Daytime Population: Residents 47,730
Total Daytime Population (TDP) 113,409
Ratio TDP/Total Population1 1.09
Population in Households 102,652
Population in Familes 78,615
Population in Group Qrtrs 1,327
Population Density2 8,572
Diversity Index3 79


Median Household Income $94,718
Average Household Income $132,458
Per Capita Income $52,206


Total Housing Units 42,129 (100%)
Owner Occupied HU 20,601 (48.9%)
Renter Occupied HU 19,992 (47.5%)
Vacant Housing Units 1,536 ( 3.6%)
Median Home Value $832,409
Average Home Value $862,394


Total Households 40,593
Average Household Size 2.53
Family Households 24,922
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  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.


2010-2017 2017-2022
Population 0.93% 0.87%
Households 0.83% 0.81%
Families 0.85% 0.81%
Median Household Income   2.3%
Per Capita Income   2.52%

San Mateo, CA - Peer Comparisons by Rank and Percentile

The table below compares San Mateo 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 # 71 95th
Population Density # 90 94th
Diversity Index # 403 73rd
Median Household Income # 216 86th
Per Capita Income # 193 87th

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

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