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Generally, only individuals domiciled in Oregon are treated as residents of the state for income tax purposes. Domicile is generally defined as the place a person considers to be their true, fixed, permanent home. A domicile is the place a person intends to return to after an absence and you can only have one domicile at a given time. It continues as the domicile until the person demonstrates an intent to abandon it and acquire a new domicile, and later actually resides in the new domicile. Factors that contribute to determining domicile include family, business activities and social connections.
Based on the information you provided, once you establish yourself in Oregon (driver's license, registering to vote, etc.), you will be considered a resident of Oregon for tax purposes.
Generally, most states have the same guidelines when determining residency.
Please let me know if you require further information or clarification.
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