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Voters check in at a voting center at the Belle Haven Community Campus in Menlo Park on Election Day on Nov. 3, 2026. Photo by Seeger Gray.

San Mateo County voters may have to wait several more days for answers in close races after an influx of mail ballots and ballots with unclear markings slowed down the election-night count.

The county’s election night results, finalized at 2 a.m. Wednesday, Nov. 4, included all votes cast at vote centers and mail ballots received through Oct. 30, rather than Nov. 1 as expected. Assistant Chief Elections Officer Jim Irizarry said the volume of ballots arriving in the final days, combined with the need to review some ballots, slowed processing.

In Redwood City, Measure E appears to be failing with just 43.74%, or 6,348 votes, compared with 56.2% of the vote, or 8,164 votes, against Measure E.Ā 

Almost 24,000 Redwood City ballots have been returned, leaving 9,465 to be counted, the office said.

The county’s next results update is expected Thursday, Nov. 5. Irizarry said the county would not release results Wednesday since election workers worked until 2 a.m. He did not know how many ballots would be included in Thursday’s update.

Longtime election workers described the flood of ballots in the final days of the election as the largest they had seen, according to Irizarry.

The count was also slowed by adjudication, a process in which two workers examine unclear markings to determine a voter’s intent. Ballots with an extra bubble filled in, a race crossed out or other marks are set aside for review before they can be counted, Irizarry said.

The workload also strained the county’s computer system. Irizarry said the volume nearly overwhelmed some servers used for adjudication, though the issue was resolved by the end of election night.

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Arden Margulis is a reporter for The Almanac, covering Menlo Park and Atherton. He first joined the newsroom in May 2024 as an intern. His reporting on the Las Lomitas School District won first place coverage...

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