Sonoma County, California
Everything a Sonoma County, California voter needs in one place: registration, voter ID, absentee and early voting, and your sample ballot. Home to about 485,000 people, Sonoma County ranks 17th in population among California's 58 counties. In California, each county elections office, often called the registrar of voters, handles registration, mails ballots and publishes the county voter information guide with your sample ballot.
Next Election
March 7, 2028
Voter Portal
Register Online
What's On My Ballot?
ID Requirements
Absentee / Early Voting
Registration Deadline
Register online or by mail at least 15 days before an election; conditional same-day registration is available after the deadline.
Why Voting Matters
Why does voting matter in Sonoma County? Because every eligible voter here has exactly the same power at the ballot box: one vote. The next election for Sonoma County voters is California's presidential primary on March 7, 2028; local elections can come sooner, so check your local election office. With health care and retail among the county's biggest employers, issues like health care costs are decided by the officials voters choose.
In the 2024 presidential election, about 251,000 ballots were cast in Sonoma County, down about 6% from 268,000 in 2020. With roughly 397,000 adults living in the county, that is around 63% of adult residents, above the statewide rate of about 51%.
That means roughly 146,000 adult residents did not cast a presidential ballot. Some are not eligible, but many are, and that is a lot of untapped power. If just one in 20 of them voted, Sonoma County would add about 7,280 voices, more than enough to decide a close local race.
Sonoma County covers about 1,576 square miles, with roughly 308 residents per square mile. The county is home to about 1.2% of California's population.
ZIP codes in or partly in Sonoma County include 94515, 94558, 94574, 94922, 94923, 94927, 94928 and 94931, plus 47 more. Check that your registration is current, look up your sample ballot, and make a plan to vote. Then ask a friend or family member in Sonoma County to do the same.
Voter Assistance Resources
Questions about voting in Sonoma County? In California, each county elections office, often called the registrar of voters, handles registration, mails ballots and publishes the county voter information guide with your sample ballot. For registration, polling places, early voting and absentee ballots, contact the Sonoma County elections office (registrar of voters).
Statewide directory, California Secretary of State's county elections offices list:
https://www.sos.ca.gov/elections/voting-resources/county-elections-offices
See your sample ballot. California county elections offices (your county mails and posts your sample ballot):
https://www.sos.ca.gov/elections/voting-resources/county-elections-offices
You can also preview a personalized ballot at Vote411.org.
To ask a question or report a problem at the polls, call or text Election Protection at 866-OUR-VOTE (866-687-8683), a free nonpartisan hotline. For help in Spanish call 888-VE-Y-VOTA (888-839-8682); for Asian languages call 888-API-VOTE (888-274-8683).
Voters with disabilities in Sonoma County can ask for an accessible voting machine, curbside voting where offered, and help from a person of their choice. If you run into barriers, contact Disability Rights California, California's Protection and Advocacy agency, at (888) 569-7955. VoteRiders (844-338-8743) offers free help with voter ID.
Need a ride? Many local transit agencies and ride services offer free or discounted rides to the polls on Election Day, so check what is available before the next election. See our California voter page for statewide options. Details can change, so confirm with the official election office.
Military and overseas voters can get help from the Federal Voting Assistance Program at 1-800-438-VOTE (8683) or fvap.gov.
Sign up to be an election worker
Election workers (often called poll workers) keep voting running smoothly in Sonoma County. Most are paid for their time, get free training, and help their neighbors cast their ballots. You can work a full day, a shorter shift, or help before Election Day. County and municipal election offices recruit and train their own workers, and the EAC's Help America Vote page links to yours. Find out how to sign up:
https://www.eac.gov/help-america-vote
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