SACRAMENTO — California voting officials have counted more than 4 million ballots from Tuesday’s primary election but they have at least 2.6 million more left to process.

The Secretary of State’s office said Thursday that it typically takes weeks for counties to process all of the ballots received, including mailed-in votes that can arrive up to three days after the election.

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Officials must verify voter status and make sure that nobody who voted provisionally at one polling place didn’t also vote by mail or at another location.

More than 500,000 of the unprocessed ballots come from Los Angeles County.

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If all the uncounted ballots are verified, turnout would be about 36 percent — up from a record low of 25 percent for the 2014 primary.