Vote Clock

Early voting locations in San Mateo, California for November 3, 2026

Map of California with San Mateo County, home to San Mateo, highlighted
San Mateo County, California, home to San Mateo. Map: U.S. Census Bureau boundaries.

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San Mateo is in San Mateo County. San Mateo has about 103,337 people, by the U.S. Census Bureau's 2025 estimate, which also gives its county lines. San Mateo County lists 50 early voting sites; 6 of them are in San Mateo and listed here.

From the California Secretary of State's official list, checked October 14, 2026. Hours can change, so check before you go.

San Mateo early voting sites (6)

Every early voting site in San Mateo County (50) is on the San Mateo County early voting page, with a ZIP code finder.

San Mateo Election Day vote centers (6)

Tuesday, November 3. Polls close at 8 p.m.; if you are in line by 8 p.m., you can vote.

All 50 San Mateo County Election Day vote centers are on the San Mateo County page.

San Mateo County elections office

San Mateo County Elections Office

Office: 40 Tower Road, San Mateo, CA 94402

Phone: 650-312-5222

Regular office hours: 8 a.m. to 5 p.m.

Directions

California voting dates for San Mateo voters

DateWhat
Mon, Oct 5 EndedBallots go out to all voters source
Mon, Oct 5 StartedEarly voting opens source
Mon, Oct 19Last day to register source
Tue, Oct 27Last day to request a replacement ballot by mail source
Tue, Nov 3, 8:00 PMElection Day: polls open 7:00 a.m. to 8:00 p.m. source
Tue, Nov 3, 8:00 PMRegister and vote the same day source
Tue, Nov 3, 8:00 PMReturn your ballot source

San Mateo voting questions

Where can I vote early in San Mateo?

At the 6 early voting sites in San Mateo on this page, from each county's official list. San Mateo County lists 50 sites in all; see the San Mateo County early voting page.

When does early voting start in San Mateo?

Early voting in San Mateo (San Mateo County) started Monday, October 5, 2026 at the first sites to open. Some sites open later; each site's days are on this page.

When does early voting end in San Mateo?

The last day of early voting in San Mateo (San Mateo County) is Monday, November 2, 2026. Election Day is Tuesday, November 3.

What are the early voting hours in San Mateo?

Hours differ by site and day. The most common hours are 9:00AM-5:00PM. Check the site you plan to use before you go.

Where do I vote on Election Day in San Mateo?

In this Voter's Choice Act county you can vote at any vote center in the county. San Mateo County lists 50 Election Day vote centers on the San Mateo County page. Tuesday, November 3. Polls close at 8 p.m.; if you are in line by 8 p.m., you can vote.

Who can vote early in San Mateo?

Any registered voter in San Mateo (San Mateo County). In California you can vote at any early voting location in your county (vote centers in Voter’s Choice Act counties). Same-day voter registration is offered where marked.

What is the phone number of the election office for San Mateo?

650-312-5222, the San Mateo County Elections Office, 40 Tower Road, San Mateo, CA 94402.

Which county runs elections in San Mateo?

San Mateo County. San Mateo voters register and vote with San Mateo County.

More for San Mateo voters

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Sites, days and hours are San Mateo County's own, copied from its official list (named above); office details are from the California Secretary of State, County Elections Offices (checked October 14, 2026). Dates are California's, each linked to its source. Call the office before you go; city population and county lines are from the U.S. Census Bureau.