Contra Costa County election workers are still chipping away at last Tuesday's statewide primary, and yesterday, the elections office dropped its third interim update to the unofficial results. The latest file folds in more late-arriving mail ballots along with additional in-person votes from centers and precincts, trimming down what was left hanging after Election Night and giving a sharper snapshot of countywide turnout. Officials are still stressing that everything on the board remains unofficial until the canvass is certified.
What the county posted
According to Contra Costa Elections, the third interim file pulls together vote-by-mail ballots received by Election Day, those received by the county’s Tuesday receipt deadline, and in-person ballots from REV vote center sites and all polling places. The office linked the update to an Election Summary Report so readers can dig into a contest-by-contest breakdown.
#CoCoVote 3rd interim updated unofficial results for 6/2/2026 Statewide Primary Election including results from VBM ballots received by election day and through 6/9 deadline, in-person ballots from REV Sites and in-person ballots from all polling places: https://t.co/hvoUTjfvFo
— Contra Costa Elections (@cocoelections) June 12, 2026
County totals so far
The county's Election Summary Report (PDF) shows, in an earlier update posted on Wednesday, that 299,681 vote-by-mail ballots and 23,741 in-person ballots had been counted. That comes to 323,422 ballots cast and a reported turnout of 44.21% of the county’s 731,497 registered voters. The figures reflect ballots processed and verified during that run time and are listed in the county's public summary.
What happens next
California law allows counties to count vote-by-mail ballots postmarked by Election Day and received up to seven days after Election Day, which explains Contra Costa’s Tuesday cutoff for late-arriving mail ballots. The same rules require counties to finish the official canvass by July 2. The California Secretary of State sets out those deadlines in the statewide election calendar and calls for regular public updates while the canvass is underway.
Watch for more updates
Contra Costa's elections office says it will keep posting interim files and result PDFs until the canvass is complete. Voters who want to track every batch can follow the county’s results page or the office’s X account for the latest postings. Officials emphasize that any shifts before certification come from verified additions to the count and do not change the legal process for determining the winners.
