Residency of a state also takes into account intention. If you kept your Washington driver's license and were still registered to vote there but were temporarily in Arizona for work, you might make a case that you were a resident of Washington all year and a non-resident working in temporarily in Arizona.
If you moved with the intention of taking up residence in Arizona, changed your license, voted there, and changed all your mailing addresses to Arizona, a case could be made that you did become a resident of Arizona, and you would file a part year resident return for both states.
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