Parents or legal guardians will need to provide the following documents: Proof of Residency in Fairfax County. Evidence of domicile includes documents such as property ownership, voter registration, driver's license, and income tax filings.How do you establish residency? I further certify that the documentation presented as proof of domicile in Fairfax County attests to my permanent move to Fairfax County. To establish a domicile in Virginia, you must show you have legal residence in the state with the intent to remain indefinitely.