Mailing everyone may make such errors bigger, since more packets go out. But states where voters must ask for mail ballots had duplicates too, and no data we found compares rates.
California mails ballots to all active voters11, one of eight states set up for all-mail elections12. Illinois, Georgia, Iowa, Wisconsin and Pennsylvania aren't on that list, and voters there apply, though Illinois has an opt-in permanent list and Pennsylvania an annual one13,14,15,16,17.
Those states had duplicates too. Kane County, Ill.: 2,000 of 43,000 mailed, about 4.7% by our calculation18. Athens-Clarke County, Ga.: 1,15419. Warren County, Iowa: 61315. Madison, Wis.: 2,215 in 202420. Westmoreland County, Pa.: 15721. Snopes counted at least 10 reports in eight states this cycle, including Utah6.
The post has a point on scale. Tulare's was the largest accidental double mailing we found this fall. Maryland's primary was bigger and different: a vendor error led that request state to reissue ballots to everyone who had requested one, more than 500,000 people5,22. Fresno County says at least 15,000 voters got a second ballot, which its registrar ties to legally required reissues7. Neither the Bipartisan Policy Center's 2026 report nor the federal 2024 survey report counts duplicates mailed23,24.