How to apply using the NRMLA Affidavit? That we are eighteen years of age or older, have personal knowledge to testify to the matters stated herein, and are competent to bear witness under oath.To the Clerk of the Circuit Court for Harford County, Maryland: APPLICATION. A marriage license must be obtained from the clerk of Circuit Court for the county, or Baltimore City, where the marriage will be performed. Most Maryland family law court forms are in this index. No such official governmentissued document exists in Maryland, but sample affidavits are available at this library. Before mailing the affidavit, please make certain that the information on the form is accurate, legible, and complete. My wife will be getting affidavits from 2 of her friends that I met in Japan while visiting. What is an Affidavit of Service? The Affidavit of Service is a statement made under oath that the other party was served.