An affidavit of marriage is a legal document and a sworn statement submitted to the court or another institution, to verify that two people are married. Our office only registers licenses issued in San Diego County.Appointments are available up to 7 weeks in advance and fill up quickly. An affidavit is a written statement made under oath that is typically used in legal proceedings. Learn their purpose, when to use, and how to write. Resources and information to help you navigate your court case, including step-by-step guides for following procedures and help with understanding your options. The application to request a Letter of No Record is the same as a request for a marriage certificate. Essentially, you are requesting a marriage certificate. Updates and corrections occur on a daily basis.