If you're reading this blog, you probably know that we are still waiting for all the ballots to be counted in a couple of unresolved U.S. House races in California. But one thing you might not know is why California takes so long to count all its votes.
California isn't alone in this regard. Every state waits at least some period of time after Election Day to count certain types of ballots, such as overseas and military absentees (which take time to arrive) and provisional ballots (which must be double-checked to make sure the voter is eligible).
But there are some reasons why California takes especially long. First of all, California conducts its elections predominantly by mail, and mail-in ballots take longer to process and count because their signatures have to be verified, they have to be removed from envelopes, etc. This is also the reason other predominantly vote-by-mail states, like Nevada, take a long time to count. But one issue California has that Nevada doesn't is sheer size. The largest state in the union casts literally millions of votes, and it simply takes time to count them all.
California law also encourages a leisurely counting pace. The state allows mail ballots to arrive as late as one week after Election Day and still count (as long as they are postmarked by Election Day), which creates the opportunity for more people's votes to count, but also means results will take longer. California also doesn't require counties to finalize their results until 30 days after the election, and some counties take full advantage of that window — there was an excellent article in the Los Angeles Times last week about Lake County, California, and why officials there don't feel a sense of urgency to finish counting.
Of course, another part of the story is that if election officials had more resources (such as more advanced machines and more staffers), they would be able to count more quickly. According to a poll earlier this year by the pro-voting-rights Brennan Center for Justice, 83% of election officials said they needed more resources to keep up with administrative and security needs, and overall, election officials received $1 billion less in federal funding this year than in the 2020 election.