Submit a Map Proposal

  1. Submit a Map Proposal
  2. Envíe sus propuestas de mapas.
  3. 提交你的地图提案

Submit a Map Proposal

Share your District Boundary Proposal

What are District Map Proposals?

Every ten years, county supervisorial districts must be redrawn so that each district is substantially equal in population. This process is called redistricting and is important in ensuring that each supervisor represents approximately the same number of constituents.

Criteria for Drawing District Boundaries

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.


  1. Contact Us
  2. FAQs
  3. Preguntas frecuentes
  4. 问答 – 中文(简体)
  5. Resources

Contact Us

  1. Sign up to Receive Email Updates


    Subscribe to receive email updates

    Submit Comments Using the Online Mapping Tool

    Use our easy online mapping tool to:

    Submit Comments Using the Online Form Submittal

    Submit Comments by Email

    Additional 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.

    Media Inquiries

    Please contact the Office of Communications and Media via email or at (925) 313-1180.

    Contact Information in Chinese (Simplified)(PDF)