Solano County, California
Voting in Solano County, California? Find registration links, ID rules, early and absentee voting options and your sample ballot here. Home to about 455,000 people, Solano County ranks 19th 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
In Solano County, the people who show up to vote decide who represents everyone. The next election for Solano County voters is California's presidential primary on March 7, 2028; local elections can come sooner, so check your local election office. Local work in health care and retail means debates over health care costs directly affect Solano County families.
Solano County voters cast about 190,000 ballots for president in 2024, down about 8% from 206,000 in 2020. Compared with the county's roughly 361,000 adult residents, that works out to about 53%, close to the statewide rate of about 51%.
Around 171,000 adults here did not vote for president. Some aren't eligible, yet the rest are untapped power: one more voter in every 20 of them would mean about 8,560 extra Solano County ballots, enough to change the result in many close contests.
Across about 822 square miles, Solano County averages around 554 people per square mile, mixing neighborhoods, towns and open land. The county is home to about 1.2% of California's population.
ZIP codes in or partly in Solano County include 94503, 94510, 94512, 94533, 94534, 94535, 94558 and 94571, plus 14 more. Take two minutes to confirm your registration, preview your ballot with the links on this page, and decide when and how you will vote. Bring a neighbor along.
Voter Assistance Resources
Questions about voting in Solano 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 Solano 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.
Free, nonpartisan help is available before and on every Election Day: call or text the Election Protection hotline at 866-OUR-VOTE (866-687-8683). Spanish: 888-VE-Y-VOTA (888-839-8682). Asian languages: 888-API-VOTE (888-274-8683).
Voters with disabilities in Solano 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 Solano 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
Take the Next Step
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