There is no law about where or what you can use as an address, such as a mailing address or business address. The only areas in which there are residency requirements about using an address as yours are:1) Taxes--you pay state taxes (e.g. income tax) in the place that is your "principal residence"--i.e. the place where you spend most of your time; using an address you do not reside at for tax purposes can be a crime.2) Voting--where you can vote is again determined by your principal residence.3) Some jobs (e.g. certain munical or police jobs) require you to reside within the jurisdication; applying for those jobs if you don't live there can be an offense.4) If you represent in a contract or agreement that you live someplace but don't (e.g. when bidding for work, if someone wantsa local contractor) but don't, that could cause you liability.