Washington Revised Code Title 29A. Elections § 29A.04.151. Residence

(1) While employed in the civil or military service of the state or of the United States;

(2) While engaged in the navigation of the waters of this state or the United States or the high seas;

(3) While a student at any institution of learning;

(4) While confined in any public prison.

Absence from the state on business shall not affect the question of residence of any person unless the right to vote has been claimed or exercised elsewhere.