You can use the Precinct/District Lookup to look up precincts and U.S. Representative, State Senate, State Assembly, and San Mateo County Board of Supervisors districts that were updated in 2022 after redistricting.
Instructions on how to use the lookup are below.
Find out more about the redistricting process here.
Turn on / Turn off District Layer
In the right hand side of the browser, you can show or not show the different districts by checking or unchecking the box next to the district.
Click on the map to see the district an area is in. Click on the arrow in the popup to see the next district. If the layer is not turned on, the district will not show in the popup.
Search by Address
Enter an address in the upper left corner search box by either typing in the full address and clicking the magnifying glass or typing in a partial address and selecting from the popup. Once the address is located, click on the map to show each district in the popup.
Click the arrow to see the next district.
2012 Congressional Districts Map (in effect through January 2, 2023)
2012 State Senate Districts Map (in effect through December 4, 2022)
2012 State Assembly Districts Map (in effect through December 4, 2022)
2013 County Supervisorial Districts Map (in effect through January 1, 2023)