Sonoma County election workers on Wednesday morning began the chore of sorting the mail-in and provisional ballots that were not counted on Tuesday.

Election officials said it will be two to three days before they know even how many uncounted ballots there are, but estimate that as many as 35,000 ballots have not been tallied.

It may take weeks to determine the outcome of some races with razor-thin margins, including the Sonoma County Board of Supervisors contest between Susan Gorin and John Sawyer, in which Gorin holds a lead of 1,299 votes after early mail-in ballots and precincts were counted.

"We are not sure what is out there, we are going through the warehouse now," said Liz Acosta, county elections manager.