San Martin, CA Profile: Facts, Map & Data


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San Martin, California - Basic Facts

The San Martin Census Designated Place had a population of 7,354 as of July 1, 2018. San Martin ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in California. See peer rankings below.

The primary coordinate point for San Martin is located at latitude 37.0829 and longitude -121.5963 in Santa Clara County. The formal boundaries for the San Martin Census Designated Place (see map below) encompass a land area of 11.6 sq. miles and a water area of 0 sq. miles. Santa Clara County is in the Pacific time zone (GMT -8). The elevation is 289 feet.

The San Martin Census Designated Place (GNIS ID: 2409264) has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

California is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The San Martin Census Designated Place is located within South Santa Clara Valley CCD of Santa Clara County.

Beneath the boundary map are tables with San Martin population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2018.

Alternate Unofficial Names for San Martin: Mills Switch Station.

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San Martin Census Designated Place, CA Boundary Map

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San Martin, CA Data & Demographics (As of July 1, 2018)


Total Population 7,354
Population in Households 7,260
Population in Familes 6,265
Population in Group Qrtrs 94
Population Density2 634
Diversity Index3 82


Median Household Income $109,832
Average Household Income $142,645
Per Capita Income $41,727


Total Housing Units 2,151 (100%)
Owner Occupied HU 1,385 (64.4%)
Renter Occupied HU 668 (31.1%)
Vacant Housing Units 98 ( 4.6%)
Median Home Value $1,048,998
Average Home Value $1,183,400


Total Households 2,053
Average Household Size 3.54
Family Households 1,640
Average Family Size 4
  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 0.55% 0.58%
Households 0.36% 0.44%
Families 0.38% 0.48%
Median Household Income   3.13%
Per Capita Income   3.26%

San Martin, CA - Peer Comparisons by Rank and Percentile

The table below compares San Martin 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 # 556 63rd
Population Density # 880 42nd
Diversity Index # 317 79th
Median Household Income # 147 90th
Per Capita Income # 372 76th

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

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