The San Mateo County Board of Supervisors on Dec. 14, 2021, unanimously approved a new map that establishes supervisorial district lines. This map is available at here.

The redistricting process is now complete. This site serves as an archive of the 2021 redistricting process that includes background information, public meeting schedules, draft maps and other resources required by Elections Code Section 21508(g).  Various links and outreach tools, including a dedicated email address, have been deactivated. For information about the County of San Mateo, and the Board of Supervisors, please go to

Details about the new map can be found at here. Which district do you live in? You can find a look-up tool at here.

The Redistricting Process

Every 10 years, local governments use new data from the Census to redraw their district lines to reflect how local populations have changed. State law requires cities and counties to engage communities in the redistricting process by holding public hearings and doing public outreach, including to underrepresented and non-English-speaking communities. This effort is led by the Supervisorial District Lines Advisory Commission. The County of San Mateo is asking for your help to plan and draw new County districts.

The finalized maps that you will help us create will define the five San Mateo County district borders and these new districts will impact how you elect your Supervisors for the next 10 years.

Our primary goal when developing election districts is to draw lines that respect neighborhoods, history and geographical elements. So we want to know: What do you consider the boundaries of your neighborhood?

How to Participate

There are many ways to participate in redistricting and we invite you to get involved!

  • Submit written testimony about the process or a specific map to
  • Complete a Community of Interest survey, available online or for printing here.
  • Share your opinions / provide public comment using the hashtag #SmcDistrictLines on Twitter and Facebook.
  • Click here to see the calendar of workshops and public hearings at which you can speak about the process or a specific map.
  • Click here for information on drawing and submitting maps.

At the hearings and workshops, we want you to:

  • Share your story
  • Define your neighborhood or community of interest
  • Explain why redistricting is relevant to your community
  • Get the tools you need to draw a map of one district or of all five districts
  • Share your opinions of the draft maps
  • Talk to your neighbors and local organizations

Email Updates

This form is no longer active.