Preliminary projections Friday show nearly two-thirds of the state's registered voters cast ballots in last week's election, a recent record for a non-presidential general election.
County officials estimate that about 12.8 million ballots were cast by the record 19.7 million Californians who registered to vote.
That puts turnout at nearly 65 percent. It's the highest for any gubernatorial election in California since at least 2006. It's much higher than the last midterm election in 2014, when turnout was a record low 42 percent.
Turnout was about 60 percent in 2010 and 56 percent in 2006 during other gubernatorial election years. It topped 75 percent during the presidential election two years ago, and 72 percent in 2012. The recent record was nearly 80 percent in 2008.
The California secretary of state reported Friday that more than 10 million ballots have been tallied so far. County officials estimated nearly 2.7 million remained uncounted.