The Pennsylvania Affidavit of Last Known Address is a legal document used to notify the state government of the last known address of an individual or business. This document is used when a party needs to locate someone, typically for the purpose of serving court documents or collecting a debt. There are three types of Pennsylvania Affidavit of Last Known Address: the Affidavit of Last Known Mailing Address, the Affidavit of Last Known Residence Address, and the Affidavit of Last Known Business Address. The Affidavit of Last Known Mailing Address is used when the individual or business has a different mailing address than their residence or business address. The Affidavit of Last Known Residence Address is used when the individual or business has a different residence address than their mailing or business address. The Affidavit of Last Known Business Address is used when the individual or business has a different business address than their residence or mailing address. The Pennsylvania Affidavit of Last Known Address must be signed and notarized by the party or parties involved, and it must include the full name, address, date of birth, and Social Security Number of the individual or business. The document must also include the date of the last known address and the signature of the notary public.