Domiciliary Residents: Individuals whose state of legal residence in the technical sense is Virginia are domiciliary residents. Domicile. Eligibility for In-State Tuition Rates.Domicile refers to the place you call home permanently. Your domicile is important for legal purposes such as paying taxes, voting, and claiming benefits. Parents or legal guardians will need to provide the following documents: Proof of Residency in Fairfax County. A domicile is your legal address, and your domicile is located in the state where you pay taxes. What are my vehicle tax obligations as an active duty service member maintaining Fairfax County as my legal residence? Vehicles normally garaged or parked in Fairfax County must display Virginia license plates within 30 days of purchase or move-in. Can my classification change to out-of-state? Yes, please fill out the Owner Exemption Statement Form.