Register to Vote
You may register at any time, but to be eligible to vote in an upcoming election, your Voter Registration Form must be applied on-line by midnight no later than 15 days before that election. If you are mailing a Voter Registration Form, it must be postmarked no later than 15 days before that election and received by the San Mateo County Registration & Elections Division by the close of the polls on election day.
If you miss the 15-day deadline to register to vote, you can register “conditionally” at 40 Tower Road, San Mateo. Other facilities may be open for conditional voter registration (CVR), depending on the Election. Please check election-specific information for locations and dates.
You may register to vote if you meet all of the following requirements:
- Citizen of the United States
- Resident of California
- At least 18 years of age on or before election day
- Not in prison or on parole for the conviction of a felony.
Once your registration form is received and processed, we will send you a Voter Notification Card within 3 to 4 weeks indicating that you are now a registered voter. You can also check your eligibility online. If you are unsure about your voting status, please call the San Mateo County Registration & Elections Division directly at (650) 312-5222.
Register to Vote Online
You may register to vote or change your registration information online by clicking the button below. You will be redirected to the Secretary of State's website where you will be asked to enter your personal information and provide your driver's license number and the last four digits of your social security number.
The Secretary of State's website is also for voters who want to update their registration with a new address, new name, party change, permanent vote by mail status, or other information. Re-registering using the website will not create a duplicate record.
Note: Please make sure all fields are entered accurately. Allow 48 hours or more for applications to process.
Register to Vote by Mailing
You may register by mailing a completed Voter Registration Form to the San Mateo County Registration & Elections Division. Forms are available in person at public libraries, city and county offices, California Department of Motor Vehicles offices, and at U.S. Post Offices, or via on-line download. You may also call our office at (650) 312-5222 and we will mail a form to you within one business day. To pick up a Voter Registration Form in person, look at our index for a location near you.
Uniformed and Overseas Voters
San Mateo County voters who are overseas or in the military may register and apply for a Vote by Mail ballot by completing a Federal Post Card Application form (Standard Form 76). This form is available at your local US Embassy or by visiting the Federal Voting Assistance Program website at www.fvap.gov.
Re-register to Vote
You must re-register to vote if you:
- change your name
- change your address
- want to change your political affiliation (party)
Just fill out the attached "Authorization to Cancel Registration" form and sign and date it. You may return it by mail, fax or email it to:
San Mateo County Registration & Elections Division
40 Tower Road
San Mateo, CA 94402
fax: (650) 312-5348
If you have any questions, please contact us at (650) 312-5222. Thank you.
To find out more information about a political party, information can be found by looking at the Political Party Index. You can also learn more about the political parties with this easy reference guide. Easy Voter Guide - Political Parties
If you need further assistance with completing the Voter Registration Form, please call the San Mateo County Registration & Elections Division at (650) 312-5222. Assistance at the Secretary of State's office is also available in the following languages at the following toll free phone numbers:
- Chinese (800) 339-2857
- Japanese (800) 339-2865
- Spanish (800) 232-8682
- Tagalog (800) 339-2957