County elections officials rejected more than 11,000 mail-in ballots in the 2024 November election.
Data from the Department of State shows about 2,600 ballots were turned down for having the wrong date.
Nearly 2,100 others had no date at all.
About 3,000 ballots didn't count because voters failed to use the secrecy envelope and more than 3,500 were thrown out because they lacked a signature.
In addition, nearly 7,000 mail-in ballots were not counted because they arrived after the 8 p.m. cut-off time on Election Day.
The department's numbers show about 88% of mail-in ballots requested were returned by voters.