Alum Rock, CA Profile: Facts, Map & Data


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Alum Rock, California - Basic Facts

The Alum Rock Census Designated Place had a population of 11,484 as of July 1, 2018. Alum Rock ranks in the upper quartile for Population Density and 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 Alum Rock is located at latitude 37.3694 and longitude -121.8239 in Santa Clara County. The formal boundaries for the Alum Rock Census Designated Place (see map below) encompass a land area of 0.85 sq. miles and a water area of 0 sq. miles. Santa Clara County is in the Pacific time zone (GMT -8). The elevation is 151 feet.

The Alum Rock Census Designated Place (GNIS ID: 2407736) 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 Alum Rock Census Designated Place is located within San Jose CCD of Santa Clara County.

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

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Alum Rock Census Designated Place, CA Boundary Map

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Alum Rock, CA Data & Demographics (As of July 1, 2018)


Total Population 11,484
Population in Households 11,125
Population in Familes 9,587
Population in Group Qrtrs 359
Population Density2 13,530
Diversity Index3 90


Median Household Income $66,271
Average Household Income $83,128
Per Capita Income $20,851


Total Housing Units 2,834 (100%)
Owner Occupied HU 1,644 (58.0%)
Renter Occupied HU 1,057 (37.3%)
Vacant Housing Units 133 ( 4.7%)
Median Home Value $513,249
Average Home Value $563,984


Total Households 2,701
Average Household Size 4.12
Family Households 2,217
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 0.66% 0.65%
Households 0.45% 0.52%
Families 0.49% 0.55%
Median Household Income   3.39%
Per Capita Income   3.19%

Alum Rock, CA - Peer Comparisons by Rank and Percentile

The table below compares Alum Rock 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 # 461 70th
Population Density # 24 98th
Diversity Index # 34 98th
Median Household Income # 584 62nd
Per Capita Income # 1171 23rd

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

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