If you are registering for the first time, registered by mail, and didn’t include your driver’s license or California ID number or the last 4 digits of your Social Security number on your registration, you you may be asked to provide ID when you vote. See the section on Voter ID Requirements for a complete list of acceptable forms of ID to bring to the polls.
Election Day Registration:
If the voter registration deadline has passed, you can still conditionally register to vote and cast a provisional ballot in person at your County Elections Office at any time up to and including Election Day. Your provisional ballot will be counted when your County Elections Official verifies your voter registration.
Conditional registration may also be available in County Elections satellite offices and vote centers.
To register in California you must: