Census 2020

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Despite the challenges of 2020, Contra Costa County had an extremely successful Census count. The County achieved the third highest Census 2020 self-response rate of all California counties with a rate of 77.4%. The County’s self-response rate also surpassed its Census 2010 rate of 72.1% by more than five points or a 5.3% increase. 

The County’s high response rate is owed in large part to the work of community-based organizations, cities, agencies, community partners, and trusted messengers who helped reach Contra Costa residents, including hard-to-count populations.   



  • Increased self-response rate by more than five points than 2010

  • Third highest self-response rate of all CA counties 

  • Second highest city self-response rate in state in Contra Costa County (Clayton) 

  • Developed strong relationships with 67 organizations throughout the county 

  • Increased participation of hard-to-count populations 

  • Nearly all cities in the County surpassed their 2010 rates, and those that did not were within 1% of doing so 

  • Strengthened regional relationships with other Bay Area counties and the State government.  


All during a global pandemic, time of social unrest, and a dangerous fire season 



  1. Census 2020
  2. Censo 2020
  3. Senso 2020
  4. 2020 年人口普查
  5. Cuộc Điều Tra Dân Số 2020
  6. سرشماری سال 2020
  7. 2020 인구조사

Starting March 12, 2020 Contra Costa County residents will receive an envelope from the U.S. Census Bureau inviting them to fill out their Census form. These envelopes will be postmarked from Jefferson, Indiana and the letters will contain an ID code and instructions from the Census Bureau to get counted in the 2020 Census. 

English Video Guide to Completing the Census

American Sign Language Video Guide to Completing the Census

Find Video Guides in 59 different languages

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