In order to apply for a mail-in ballot, you must supply your PA Driver’s License or PennDOT issued photo ID card number in the Identification section. If you do not have a PA Driver’s License or PennDOT issued photo ID card, you must apply by mail by supplying the last four (4) digits of your Social Security number in Section 5.
If you do not have a valid form of either of these types of identification, please check the box titled “I do not have a PA driver’s license or a PennDOT ID card or a Social Security number” in the Identification section. If you choose this option, you must enclose a photocopy of an acceptable ID that indicates your eligibility to vote.
The application can be found here.