San Mateo County Libraries Voter Resources
Get everything you need to vote in San Mateo County: register to vote, check your registration status, find your polling station, learn about the candidates and access reliable election information and nonpartisan voter resources.
Important Dates for the June 2026 Primary Election
May
4
Ballots are mailed to registered voters in the state of California. Vote early at a Vote Center, opens a new window, by mail, opens a new window or at an available ballot drop box, opens a new window.
May
18
Deadline to register to vote, opens a new window in California online or postmark date for mail registration. In-person registration may occur at Vote Centers, opens a new window through Election Day.
June
2
On Election Day, all San Mateo County Vote Centers, opens a new window will be open from 7 AM - 8 PM. Vote-by-mail ballots must be postmarked on or before Election Day.
The current district maps were updated in 2022 and can be found at smcacre.org/elections/new-2022-political-districts, opens a new window
Ways to Vote
San Carlos Library’s vote center opens on May 23.
Belmont and Half Moon Bay libraries’ vote centers open on May 30.
Secure ballot drop boxes will be available at the Belmont, East Palo Alto, Half Moon Bay, North Fair Oaks, Portola Valley, San Carlos and Woodside libraries.
Voting in San Mateo County
Here is information on how to register to vote, checking registration and ballot status, and resources to support access to voting.
Voter Registration
Check Your Voter Registration Status
Where's My Ballot?
Register to Vote
Check Your Voter Registration Status
Where's My Ballot?
Register to Vote
Election Information
Check out these websites for more election information and fact-checked resources.
Voter Registration
June 2 Statewide Direct Primary Election Information
California’s Official Voter Information Guide
2026 CalMatters Voters Guide
June 2 Statewide Direct Primary Election Information
California’s Official Voter Information Guide
2026 CalMatters Voters Guide
For voter registration assistance or questions in San Mateo County, call or text (650) 312-5222
This webpage includes information such as voter registration, election information, and fact-checking resources. Many websites we link here offer information in multiple languages. Dates or voter guides for elections may be listed from a recently passed election but updated before upcoming elections.