Purpose: To request domicile verification from a nonrelative who is familiar with the household's situation. In-county (in-district): A person currently residing in Dallas County who has lived in Texas for the past 12 months.Domicile refers to the place you call home permanently. Your domicile is important for legal purposes such as paying taxes, voting, and claiming benefits. Affidavit of Domicile is a form in our office for people to sign before a notary claiming Texas to be your home. We file the form with the court. Domicile: A person's principal, permanent residence to which the person intends to return after any temporary absence. Domicile is the place a person intends to establish a permanent home. Your "domicile" is your primary, permanent residence, also known as your home. You can have more than one residence, but you can only have one domicile.