Three Rocks, CA Profile: Facts, Map & Data


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Three Rocks, California - Basic Facts

The Three Rocks Census Designated Place had a population of 222 as of July 1, 2018. Three Rocks 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 Three Rocks is located at latitude 36.5051 and longitude -120.3935 in Fresno County. The formal boundaries for the Three Rocks Census Designated Place (see map below) encompass a land area of 0.75 sq. miles and a water area of 0 sq. miles. Fresno County is in the Pacific time zone (GMT -8). The elevation is 423 feet.

The Three Rocks Census Designated Place (GNIS ID: 2583162) 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 Three Rocks Census Designated Place is located within Mendota CCD of Fresno County.

Beneath the boundary map are tables with Three Rocks 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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Three Rocks Census Designated Place, CA Boundary Map

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Three Rocks, CA Data & Demographics (As of July 1, 2018)


Total Population 222
Population in Households 216
Population in Familes 185
Population in Group Qrtrs 6
Population Density2 296
Diversity Index3 81


Median Household Income $32,309
Average Household Income $48,353
Per Capita Income $12,029


Total Housing Units 60 (100%)
Owner Occupied HU 14 (23.3%)
Renter Occupied HU 35 (58.3%)
Vacant Housing Units 11 (18.3%)
Median Home Value $143,750
Average Home Value $169,231


Total Households 49
Average Household Size 4.41
Family Households 41
Average Family Size 5
  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 -1.24% -0.55%
Households -1.39% -0.41%
Families -1.12% -1.0%
Median Household Income   3.26%
Per Capita Income   3.8%

Three Rocks, CA - Peer Comparisons by Rank and Percentile

The table below compares Three Rocks 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 # 1317 13th
Population Density # 1055 30th
Diversity Index # 355 77th
Median Household Income # 1429 6th
Per Capita Income # 1456 4th

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

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