Precinct Information
New Precinct Numbering in 2021
In February 2021, San Mateo County Registration & Elections Division updated our precinct numbering. Precinct numbers changed from 4 digits to 5 digits.
Click here for a reference sheet that shows the old and new precinct numbers for the county.
Precinct Lookup Map
Click to View San Mateo County Precinct Lookup Map
The map has been updated to reflect the new precinct numbering.
Last updated March 2021
Election Precincts in the Property Map Portal
View the Election Precincts in the Property Maps Portal:
1. Click Property Maps Portal and make sure you are on the screen below:
Download Precinct Information
Precinct boundary Information is available to download in Shapefile, Geodatabase, AutoCAD, Google DML and GeoJSON formats.
Click GIS Download Data to link to the page and navigate to the Jurisdictional Boundaries section.
Political Districts
Political maps within San Mateo County:
Congressional Map
Senate Map
Assembly Map
Supervisorial District Boundaries Map
Redistricting in California
California Citizens Redistricting Commission
The California Constitution (Article 21, Section 1) requires an adjustment (“reapportionment”) of election districts every ten years, in the year following the federal census. The intent of this requirement is to “reapportion” the number of people within political districts of the state to reflect changes in population.
Precinct Maps in PDF
Please use the Precinct Lookup Map to locate precincts.
Below is legacy data that is no longer being updated.
Last updated October 2020.
Click on the name of an area to view the 2020 precinct map:
- Belmont
- Brisbane
- Burlingame
- Daly City Colma
- East Palo Alto
- Foster City
- Half Moon Bay
- Hillsborough
- Menlo Park
- Millbrae
- Pacifica
- Portola Valley
- Redwood City
- Redwood Shores
- San Bruno
- San Carlos
- San Mateo
- South San Francisco
- Unincorporated Coastside
- Unincorporated La Honda-Pescadero
- Unincorporated Skyline San Gregorio
- Woodside
- Atherton
- Read more