About Redistricting

  1. About Redistricting
  2. La restructuración distrital
  3. 关于重划选区

Every ten years, local governments use new census data to redraw their district lines to reflect how local populations have changed. Assembly Bill 849 (2019) requires cities and counties to engage communities in the redistricting process by holding public hearings and/or workshops and doing public outreach, including to non-English-speaking communities.

The Contra Costa County Board of Supervisors adopted the new District Boundaries at the November 23, 2021 Public Hearing and are no longer accepting public comments. All items including, maps, videos, public comment, and calendars of events will remain on the Dedicated Redistricting Website and available for the public to view.

What is redistricting? 

Every ten years, districts must be redrawn so that each district is substantially equal in population. This process, called redistricting, is important in ensuring that each board member represents about the same number of constituents. In Contra Costa County, the Board of Supervisors is responsible for drawing supervisorial districts. Redistricting is done using U.S. Census data, which is anticipated to be released by September 30, 2021. For the County of Contra Costa, the redistricting process must be completed by December 15, 2021.

Why does redistricting matter to me?

Redistricting determines which neighborhoods and communities are grouped together into a district for purposes of electing a board member. The Board of Supervisors will seek input in selecting the next district map for our supervisorial districts. You have an opportunity to share with the Board of Supervisors how you think district boundaries should be drawn to best represent your community.

What do the existing supervisorial districts look like?

View a map of the County’s current supervisorial districts (PDF).

What criteria will our Board of Supervisors use when drawing district lines?

To the extent practicable, in accordance with the FAIRMAPS Act (AB 849) and as amended by AB 1276, district lines will be adopted using the following criteria in ranked order:

  1. Geographically contiguous districts (each supervisorial district should share a common border with the next),
  2. The geographic integrity of local neighborhoods or Communities of Interest shall be respected in a manner that minimizes its division,
  3. The geographic integrity of a city or census designated place shall be respected in a manner that minimizes its division,
  4. Supervisorial district boundaries should be easily identifiable and understandable by residents. To the extent practicable, supervisorial districts shall be bounded by natural and artificial barriers (rivers, streets, highways, rail lines, etc.) or by the boundaries of the county,
  5. Lines shall be drawn to encourage geographic compactness.

In addition, boundaries shall not be drawn for purposes of favoring or discriminating against a political party.

How will our Board of Supervisors notify the public about redistricting?

The Board of Supervisors will reach out to local media to publicize the redistricting process. Also, we will make a good faith effort to notify community groups of various kinds about the redistricting process.

Language or other accommodations can be provided at our public hearings and workshops  if a request is submitted at least 72 hours in advance. Request an accommodation via email.

The Board of Supervisors will notify the public about redistricting hearings and workshops, post district maps online before maps are adopted, and create a dedicated web page for all relevant information about the redistricting process.

How can I get involved?

The Board of Supervisors will be holding hearings and workshops to receive public input about Communities of Interest and where district lines should be drawn.

Where can I find out more?

The County maintains a webpage on the county’s redistricting process at CoCoRedistricting.org.

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Contact Us

  1. Redistricting Questions

    You can contact the Clerk of the Board by email to find out more about how the process works or if you have any other questions.