Clayton, CA Profile: Facts, Map & Data


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Clayton, California - Basic Facts

The City of Clayton had a population of 11,639 as of July 1, 2018.

The primary coordinate point for Clayton is located at latitude 37.9403 and longitude -121.9301 in Contra Costa County. The formal boundaries for the City of Clayton (see map below) encompass a land area of 3.84 sq. miles and a water area of 0 sq. miles. Contra Costa County is in the Pacific time zone (GMT -8). The elevation is 394 feet.

The City of Clayton (GNIS ID: 2409474) 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 Clayton is located within Central Contra Costa CCD of Contra Costa County.

Beneath the boundary map are tables with Clayton 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 Clayton: Clayton's, Claytonville, Deadfall.

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City of Clayton, CA Boundary Map

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Boundary Maps: Central Contra Costa CCD | Contra Costa County | California Counties

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


Total Population 11,639
Population in Households 11,628
Population in Familes 10,370
Population in Group Qrtrs 11
Population Density2 3,031
Diversity Index3 45


Median Household Income $150,882
Average Household Income $182,790
Per Capita Income $67,565


Total Housing Units 4,347 (100%)
Owner Occupied HU 3,776 (86.9%)
Renter Occupied HU 501 (11.5%)
Vacant Housing Units 70 ( 1.6%)
Median Home Value $708,786
Average Home Value $767,697


Total Households 4,277
Average Household Size 2.72
Family Households 3,356
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 0.59% 0.72%
Households 0.47% 0.61%
Families 0.37% 0.62%
Median Household Income   1.44%
Per Capita Income   2.43%

Clayton, CA - Peer Comparisons by Rank and Percentile

The table below compares Clayton 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 # 458 70th
Population Density # 459 70th
Diversity Index # 1084 29th
Median Household Income # 50 97th
Per Capita Income # 102 93rd

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

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