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Posted on: August 13, 2021

[ARCHIVED] U.S. Census Bureau Releases First Local 2020 Census Data

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The U.S. Census Bureau has released the first local level data from the 2020 Census, the once-a-decade count of every person living in the country. This is part of the Census data that will help determine new Supervisorial districts for Contra Costa County during its Redistricting. The actual drawing of Supervisorial District Maps requires the official California State Adjusted Redistricting data, which is expected to be available in September 2021, and will include updated data to ensure incarcerated individuals are counted by each jurisdiction. 

The Census data release provides the first look at the demographic characteristics at the local level, including population change, race, ethnicity, age 18 and over population, and housing occupancy status.  

The data shows Contra Costa County’s population has increased by 10% or 116,902 people, since the 2010 Census, for a total population of 1,165,927. The 2020 Census data indicate that Contra Costa County has become increasingly diverse and multiracial.  The following provides additional detail about the 2020 Census data release. 

Detailed Data Summary

The California State Department of Finance (DOF) has provided a number of data products at the State, County, Place, and Census Tract level. These includes tables and PDF summaries.
Visit California Department of Finance Census Data webpage
View 2020 Census Data Profile (PDF) prepared by the DOF

Explore 2020 Census Demographic Data Map (U.S. Census Bureau)

View the U.S. Census Bureau's 2020 Census Demographic Data Map

Population by Supervisorial District


Supervisorial District Population Growth Chart showing population growth by Supervisorial District.

Population by Supervisorial District and Deviation from Mean                             

Districts must be redrawn so that each district is substantially equal in population.

Equal Proportion based on 2020 Census: 233,185 people.
The current spread is 8.08%, this is the difference between the highest and lowest percentage from the mean.
The percentage deviation from the mean is shown in parenthesis below. 

District 1 Population: 224,726
8,459 under (-3.63%)

District 2 Population: 243,565
10,380 over (4.45%)

District 3 Population: 239,825
6,640 over (2.85%)

District 4 Population: 229,384
3,837 under (-1.65%)

District 5 Population: 228,463
4,722 under (-2.03%)

Race and Ethnicity by Supervisorial District


Supervisorial District Race and Ethnicity Chart

City Population and Growth Rate

City2020 Population2010 PopulationGrowth Rate
Brentwood city                          64,292                          51,48119.9%
Oakley city                          43,357                          35,43218.3%
Pittsburg city                          76,416                          63,26417.2%
San Ramon city                          84,605                          72,14814.7%
Antioch city                        115,291                        102,37211.2%
Richmond city                        116,448                        103,70110.9%
Orinda city                          19,514                          17,6439.6%
San Pablo city                          32,127                          29,1399.3%
El Cerrito city                          25,962                          23,5499.3%
Walnut Creek city                          70,127                          64,1738.5%
Hercules city                          26,016                          24,0607.5%
Lafayette city                          25,391                          23,8935.9%
Moraga town                          16,870                          16,0165.1%
Pleasant Hill city                          34,613                          33,1524.2%
Martinez city                          37,287                          35,8243.9%
Danville town                          43,582                          42,0393.5%
Pinole city                          19,022                          18,3903.3%
Concord city                        125,410                        122,0672.7%
Clayton city                          11,070                          10,8971.6%

View Press Release (PDF)
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