Being considered a resident of another state depends on the reason for establishing residency, such as for voting, tax or tuition purposes, and the laws of the particular state. For tax purposes, a person is generally considered a resident of a state if his main home is in the state for an entire year, but the department of revenue for each state determines residency requirements, according to TurboTax.
In general, for voting purposes, becoming a resident of a state is as simple as moving there with the intention of staying for the length of time specified by the state, according to the Federal Voting Assistance Program. Most states require a voter to live in the state for 30 days or less, and some have no length of residency requirements at all, notes Infoplease from Pearson Education.
State boards may determine the requirements for state residency for in-state tuition purposes, according to FinAid, with the individual colleges determining whether a student qualifies. U.S. News & World Report recommends registering a car in the new state, paying state taxes, obtaining a library card and registering to vote as ways to prove state residency, which can cut back considerably on the price of tuition at a state college or university.