In this guide
- Who runs elections in San Diego County
- Step 1: Register, or update your registration
- Step 2: Watch for your ballot
- Step 3: Mark your ballot and seal it
- Step 4: Sign the envelope
- Step 5: Return it, postage-free
- Step 6: Confirm it was counted
- If you'd rather vote in person
- Where to check before every election
In San Diego County, voting by mail is the default. The San Diego County Registrar of Voters mails a ballot to every active registered voter before each election, along with a postage-paid return envelope. You mark it, sign the envelope, and either mail it or drop it in an official ballot drop box. No stamp, no application.
The two things that trip people up are timing and the signature. A mailed ballot has to be postmarked on or before Election Day and reach the county within seven days, and an unsigned envelope can't be counted until you fix it. This guide covers each step in order, from registering to checking that your ballot was counted. It explains procedure only. For anything about candidates or measures, read the official County Voter Information Guide that comes with your ballot.
Who runs elections in San Diego County
The Registrar of Voters is a County department. It keeps the voter rolls for the whole county, from Oceanside to Chula Vista, mails ballots, runs vote centers and drop boxes, and counts the results. Its office is at 5600 Overland Ave. in Kearny Mesa, and its phone line is (858) 565-5800.
Statewide rules come from the California Secretary of State, which sets deadlines and runs the ballot tracking service. When the County and the State both publish a date, they match. If you ever see two different deadlines, the official sites win over anything you read elsewhere, including this page.
Step 1: Register, or update your registration
You can register online through the Secretary of State's registration site or with a paper form from the Registrar. You also need to re-register when you move, change your name or want to change your party preference. A ballot follows your registration address, so a move that you don't report usually means your ballot goes to your old place.
The regular deadline is 15 days before an election. Miss it and you still have an option. Under Conditional Voter Registration, the Registrar lets you register and cast a provisional ballot in person at its Kearny Mesa office or at any County vote center, during the 14 days before Election Day and on Election Day itself. Your provisional ballot is counted once the Registrar confirms your registration and that you didn't vote anywhere else in the state.
California also lets 16- and 17-year-olds pre-register. Their registration becomes active automatically when they turn 18.
Step 2: Watch for your ballot
Ballots go out roughly a month before each election. The packet includes the ballot, the return envelope and instructions. The County Voter Information Guide lists vote centers and drop box locations.
If you haven't received a ballot a couple of weeks before Election Day, call the Registrar or check your status online. You can ask for a replacement, and only one ballot per voter is ever counted.
Step 3: Mark your ballot and seal it
Follow the marking instructions printed on the ballot. Use a pen with dark ink unless the instructions say otherwise. If you make a mistake, don't try to erase it or cover it up. Contact the Registrar for a replacement or bring the spoiled ballot to a vote center and vote there instead.
Put your ballot in the return envelope and seal it. Only your own ballot goes in your envelope. Two voters at the same address each get their own envelope and each sign their own.
Step 4: Sign the envelope
This is the step that matters most. The Registrar compares the signature on your envelope with the signatures in your voter record, which can include the one from your California driver's license or ID card. A missing signature, or one that doesn't match, puts your ballot on hold.
If that happens, the Registrar mails you a signature statement. Complete it and return it by the deadline printed on the form. The County has accepted these by mail, in person and at drop boxes, and the form lists the current options. Once it's processed, your ballot is counted. Signatures change over time. If yours has, updating your registration gives the Registrar a fresh one to compare.
Step 5: Return it, postage-free
You have three ways to return a ballot in San Diego County.
| Return method | Deadline | Good to know |
|---|---|---|
| U.S. mail | Postmarked on or before Election Day, received within 7 days | Envelope is postage-paid. On Election Day, ask a postal clerk for a hand-stamped postmark |
| Official ballot drop box | 8 p.m. on Election Day | Locations are listed on sdvote.com and in your Voter Information Guide |
| Vote center or Registrar's office | 8 p.m. on Election Day | You can also vote in person there instead |
Deadlines are from the California Secretary of State.
Free return postage on mail ballots was debated in Sacramento for years. Today the return envelope is prepaid, so you never need a stamp. The Secretary of State still recommends mailing your ballot at least a week before Election Day, which avoids any doubt about the postmark.
Using a drop box
Official drop boxes are labeled "Official Ballot Drop Box" and are spread around the county. The Registrar publishes the full list and a locator on sdvote.com. Drop boxes are sealed and collected by Registrar staff. If you're taking transit to one, our San Diego Trolley guide explains lines and fares.
Returning a ballot for someone else
California allows you to authorize another person to return your ballot. Fill in the authorization section printed on the return envelope and sign it.
Step 6: Confirm it was counted
If you signed up for Where's My Ballot?, you'll get a message when your ballot is received and another when it's counted. You can also check your ballot status on sdvote.com.
Counting continues after Election Day. Ballots mailed on time may still be arriving for a week, and signature statements are processed after that, so results on election night are never final. The Registrar posts updates on its site until the count is certified.
If you'd rather vote in person
Voting by mail is optional. You can bring your mail ballot to a vote center and drop it off, or surrender it and vote on a machine there. If you didn't bring it, the vote center can check your record and let you vote. Vote centers open before Election Day, with the full list in your Voter Information Guide and on sdvote.com. Accessible voting equipment is available at every vote center, and voters with disabilities can also ask about the Registrar's accessible remote vote-by-mail option.
Where to check before every election
Rules and locations change from one election to the next, and this page does not track individual elections. Before each one, check sdvote.com for dates, drop box hours and vote center addresses, and the Secretary of State's site for statewide deadlines. For more practical guides about daily life here, see our Living in San Diego section or the full list of articles.
Put it in order
Put the mail ballot steps in order
Drag or move each step into the order you would follow, from registration to confirmation.
- Check Where's My Ballot? to confirm it was counted
- Receive your ballot and the postage-paid return envelope
- Seal the ballot in its return envelope
- Register or update your registration at least 15 days before the election
- Sign the envelope so your signature can be checked
- Mail it by Election Day or leave it in an official drop box by 8 p.m.
- Mark your ballot following the printed instructions
It's covered in the section Step 5: Return it, postage-free
- Register or update your registration at least 15 days before the election
- Receive your ballot and the postage-paid return envelope
- Mark your ballot following the printed instructions
- Seal the ballot in its return envelope
- Sign the envelope so your signature can be checked
- Mail it by Election Day or leave it in an official drop box by 8 p.m.
- Check Where's My Ballot? to confirm it was counted
Next up: Ballot in the box? Plan a visit to the USS Midway Museum
Questions readers ask
Do I need a stamp to mail my ballot in San Diego County?
No. The return envelope that comes with your ballot is postage-paid, so you can drop it in any U.S. mailbox or bring it to an official ballot drop box.
What is the deadline for a mailed ballot in California?
According to the California Secretary of State, a mailed ballot must be postmarked on or before Election Day and received by the county within seven days after it. Ballots left in a drop box or at a vote center must be in by 8 p.m. on Election Day.
How do I contact the San Diego County Registrar of Voters?
The Registrar's office is at 5600 Overland Ave. in Kearny Mesa, its phone number is (858) 565-5800, and its website is sdvote.com.
What happens if I forget to sign my ballot envelope?
Your ballot cannot be counted as is. The Registrar sends a signature statement you can complete and return by the deadline printed on it so your ballot can be counted.
Can I still register after the 15-day deadline?
Yes. Through Conditional Voter Registration, you can register and vote a provisional ballot in person at the Registrar's office or at a vote center during the 14 days before and on Election Day.
