How To Write A Letter That Has To Be Notarized . If you decide on a handwritten letter using a template, try not to leave any spaces blank or unfilled. Write your address and the state and county which you belong to. 30+ Professional Notarized Letter Templates ᐅ TemplateLab from templatelab.com It’s common for a notary to require a valid id. Your full names and address, title/subject of the letter, details of the letter, dates of signing the letter, and a section for the notary to sign the letter. I have limited knowledge of this sort of thing, and i am not a lawyer.