Precinct Information

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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.

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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.