Public Participation Mapping Tools

Marin County’s supervisorial district mapping process was completed on December 14, 2021 with the adoption of an ordinance by the Board of Supervisors. 

Redistricting is different than most issues that come before the County Supervisors. Instead of being limited to simply saying you support or oppose an ordinance or resolution, this is your chance to draw a map yourself!

Map-Drawing Tools

These tools are here to help and empower you, but they are not required to use. If you prefer to draw a map on a napkin or otherwise share your thoughts, we welcome your input in whatever form you wish to share it!


Interactive Review Map — View the current district boundaries and demographic layers

2020 Demographic Report for Current Districts

Map Submission Deadlines

November 2, 2021 — Deadline for submission of maps by the public for consideration at the November 9 public hearing.

November 24, 2021 — Final deadline for submission of public plans for consideration as part of the process.

DistrictR Online Mapping Tool

DistrictR is a simple online “paint brush” tool that allows you to “paint” your neighborhood, your community of interest, or a full countywide district map. No account or login is required to access the tool.

There are many demographic overlays available if you wish to reference those data when drawing your community or map, or feel free to just zoom in and highlight the boundaries of your neighborhood. Then add a note explaining what ties your community together and submit it to the County’s redistricting team. After creating a map in DistrictR, click “Share to Public Gallery” in order to share with staff.

​To share more extensive text about the nature and story of your community, please use the “Contact Us” form and simply reference the map you drew in DistrictR.

Maptitude Online Mapping Tool

Maptitude is the most powerful map-drawing tool found here. It is an advanced online tool that allows you to draw districts census block by census block, with all of the demographic data used by the County’s demographic consultants. You can fine-tune your district lines and see the resulting demographics in real-time as you draw your map. To access the tool, you must create a user account.

Paper-Only Maps

Download a one-page printable map to draw your proposed districts and calculate the total population.

Total Population Number Maps

Cities,​ Census-Designated Places, and Freeways Map

Microsoft Excel Supplement

Use our Excel supplement to automatically calculate total population and demographic information for each district you draw. In the Excel file, click the “Assignments” tab to assign each Population Unit to a district by entering the district number into the spreadsheet. Use the Population Unit ID map to identify the Units you would like to group together to form a district. Click the “Results” tab to review the demographics for each district you’ve created.

Excel Files

Population Unit ID Maps

How to Submit Your Maps

You can submit your map electronically, by mail, or in person.


Submit by Mail or Drop Off in Person:​

County Administrator’s Office
Attn: Redistricting
3501 Civic Center Dr # 325
San Rafael, CA 94903

All submissions are part of the public record and will be posted in their entirety to the Draft Maps webpage.