A proof of residency letter is an acknowledgment or sworn statement stating that an individual resides at a specific address. Maryland law says that you have to file a document called an "affidavit" along with your motion or response.Due to federal requirements, documents are now required to be presented if your documents are not already on file with the MDOT MVA. Download a proof of residency letter template for family members, notarized or non-notarized, tailored for legal use. This article discusses the apostille procedure and the full legalization procedure for documents issued in Maryland. Maryland Notarial Certificates. Oaths and Affirmations Certificate. Generally. "I solemnly affirm under the penalties of perjury that the contents of this document are true to the best of my knowledge, information, and belief.". Always write the location where the notarization actually took place. Common documents that require notarization in Maryland include real estate deeds, title transfers, affidavits, and powers of attorney.