Domicile. A domicile is different than and more than merely residing somewhere. You would fill out this form if you're ordering a vanity plate or some other specialized plate.Simply put, your domicile is your home—the state you consider your permanent place of residence. An affidavit of domicile is a sworn statement signed before a notary public establishing the legal domicile of someone who has died. An Affidavit of Domicile is a legal document that serves as a sworn statement used to establish the residence or domicile of a deceased person. Domicile is the place where you have your permanent home. It is where you intend to return if you are living or working temporarily in another state or country. An applicant may be required to present acceptable proof of domicile in Arizona to the Department upon request. The word or phrase domicile refers to housing that someone is living in, or (law) the residence where you have your permanent home or principal establishment.