https://www.mercurynews.com/2020/10/30/heres-where-you-can-drop-off-your-ballot-or-vote-in-person/

Vote-by-mail ballots that are mailed must be postmarked on or before Election Day and received by your county elections office no later than 17 days after Election Day. There are a lot of other options to drop off your ballots without depending on the Postal Service or to vote in-person:

• Drop boxes: 66 locations open 24 hours a day. To find a location: www.acvote.org/dropbox