Every 10 years, Californians get the chance to help reshape their Supervisor districts following the decennial U.S. Census. It’s important to know about communities so that the district lines can amplify the voices of residents.

Examples of communities can include cities, neighborhood associations or planning zones, areas where many residents speak the same language, or even areas where the residents use the same community facilities. It’s basically any part where people have a common interest that needs a voice in government.

We need your help to build a community map! Please use the tools below to identify the boundaries of your community and share what makes it a community. Or you can draw a Supervisor District, or all 5 Supervisor Districts as well. Click here to see draft maps.

Maps must be submitted by October 25, 2021 to be considered by the 2021 District Lines Advisory Commission at their final meeting on October 28, 2021

Public Participation Mapping Tools

Paper Mapping Tool

Printable PDF maps are available below. Use a colored marker to draw district boundaries on the map.

Paper Map w/ Population (English)

Paper Map w/ Population (Spanish)

Alternatively, submit any form of hand-drawn map that identifies street names.

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. Click here to launch the DistrictR Application.

DistrictR Quick Start Guide:  English     Chinese

DistrictR Instructional Video

Maptitude Online Mapping Tool

Maptitude 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. Click here to launch the Maptitude application.

Maptitude User Guide:  English      Chinese

Maptitude Instructional Video

How to Submit Your Maps

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

Email: districtlines@smcgov.org

Submit by Mail or Drop Off in Person:​

County Manager’s Office
Attn: Redistricting
400 County Center, 1st Floor
Redwood City, CA 94063