First of all no, you can't use a US Postal Service PO Box as your primary address. Learn how to leave Ohio residency, establish a new domicile, manage Ohiosourced income, and minimize tax obligations.I am set up in Texas using Escapees. 4. Complete an Affidavit of Domicile and File it with the Court. Even if you don't have a permanent residence to use, you can sign up with a mail-forwarding service. File a change of address form with the U.S. Post Office. City: State: Ohio ZIP Code: ______ do certify that.