I believe a child can seek emancipation from the Court at age 16, but that's different than just "moving out of the parents house".
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In WA, a person generally becomes a legal adult when the person is 18 or marries or is otherwise emancipated by the court.
Local police departments often do not get involved when a 17-year-old moves out unless there appears to be crimes being committed against the child.
Do you have a plan for living on your own? Running a household is much more complicated than it may look. Do you have money for rent, food, clothing, and all the other expenses? Can you do lawful work to get the money?
If there is unlawful abuse at your house, and especially if there are younger children there, you may want to consider reporting the abuse.