Ballots mailed on Election Day might be postmarked too late to be counted, after the United States Postal Service made changes earlier this year with potentially far-reaching impacts on the coming election, state officials said.

The postal service’s new process means that ballots dropped at post offices and mail collection boxes more than 50 miles from five regional hubs will not be postmarked until the next day. The ballot will not be counted without a postmark of Nov. 4 or earlier.

The five hubs are located mainly near the state’s coast, with two in Los Angeles and others in San Diego, Santa Clarita, Richmond, and Sacramento. Ballot drop-off boxes open on Oct. 7. Californians can register to vote through Oct. 20, and in-person voting centers open Oct. 25.

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