Fewer than 100 mail voters in two ZIP codes in the Marietta and Mount Joy areas received return envelopes intended for other people due to a vendor error, county officials announced Friday. The Lancaster County Board of Elections became aware of the vendor error Thursday, after voters in ZIP codes 17552 and 17547 began receiving their ballots Thursday, said Christa Miller, the countyâs chief registrar. Voters who applied to vote by mail in these ZIP codes will likely continue to receive ballots that may have errors on Friday, Miller added. While the mail-ballot packet will be addressed to the voter, the envelope used to return the ballot in the mail may have a different voterâs name on it, meaning a voter who uses it could be voting on behalf of someone else.