At least 150 people were waiting to vote at the North Hollywood Amelia Earhart Regional Library in Los Angeles before it opened. Long lines were reported at polling places across the city, as voters hoped to cast their ballots before heading to work.
In Northern California, a steady stream of cars pulled up to an absentee ballot drop-off station outside a courthouse in Oakland. And at a columbarium in San Francisco that served as a polling location, people filled out their ballots on steps next to urns and crypts after officials ran out of voting booths.
Kim Alexander, president of the California Voter Foundation, said she fielded calls from people who lost their absentee ballots or wondered whether they could cast a vote in a different county because they weren't going to be in their home county. Alexander said you can vote at a different polling place in the county in which you're registered, but cautioned against trying to vote in a different county.
Tuesday's turnout appeared consistent with heavy in-person crowds reported by elections officials at polling sites over the weekend and Monday. In Los Angeles County, thousands of voters waited hours over the weekend to cast ballots, some standing in line for three hours or more. Nearly 18,000 ballots were cast Saturday and Sunday in the county.
More than 50 patients at Ronald Reagan UCLA Medical Center in Los Angeles were able to vote from their hospital beds, thanks to a volunteer program.
Lara Ibrahim had planned to vote at her usual polling place but ended up giving birth earlier than expected. She cast her ballot in her hospital room with her new baby, George, by her side. Volunteers brought ballots to eligible patients and then dropped them off at a polling station.
California is not known for long lines on Election Day, but some observers said that this election is different. There are 17 statewide ballot measures, in addition to local measures, that may take time for voters to digest while they are inside voting booths. And the state has a record 11.7 million people registered to vote by mail, some of whom may show up at polling sites unaware they have ballots at home that they need to surrender before they can get a new ballot.
Voter advocacy groups, meanwhile, are on high alert, worried about possible voter intimidation stemming from GOP presidential nominee Donald Trump's repeated assertions that the election is rigged against him.
Trump's California campaign said trained observers will report discrepancies to lawyers.
"We are not using this to suppress the vote. We are using this to make sure everyone is doing the right thing and to get their vote counted," spokesman Jon Cordova said.
Paul Mitchell, vice president of Political Data, said he expects counties this year to issue a large number of provisional backup ballots to people whose eligibility can't be immediately verified. Those ballots are counted after counties verify the voter is registered and hasn't voted already, he said, which means close contests may not be decided right away.
"As a result we have to wait for a few days for the papers to tell us who won," he said. "But the worse outcome is to not let these people vote in the first place."
Associated Press writers Sudhin Thanawala, Christopher Weber and photographer Richard Vogel contributed to this report. Weber and Vogel reported from Los Angeles.