5. Enter the county where the affidavit is notarized. 6. To create a notarized affidavit, you need to draft your statement first.Everything you need to know about notarizing affidavits. Learn what an affidavit is and how to notarize it. To get an affidavit notarized as quickly as possible, it's usually best to use an online notary service. An affidavit is a sworn statement of fact that can be used in a variety of legal proceedings, from bankruptcy cases to family and civil litigation matters. An affidavit is a single sheet of paper, but it contains the power to alter the course of events. The affidavit details the terms of an agreement for the occupant to vacate a property belonging to another individual.