Wash. Rev. Code § 29A.04.151
"Residence" for the purpose of registering and voting means a person's permanent address where he or she physically resides and maintains his or her abode. However, no person gains residence by reason of his or her presence or loses his or her residence by reason of his or her absence:
[ 2003 c 111 s 126; 1971 ex.s. c 178 s 1; 1965 c 9 s 29.01.140. Prior: 1955 c 181 s 1; prior: (i) Code 1881 s 3051; 1865 p 25 s 2; RRS s 5110. (ii) Code 1881 s 3053; 1866 p 8 s 11; 1865 p 25 s 4; RRS s 5111. Formerly RCW 29.01.140.]
Residence, contingencies affecting: State Constitution Art. 6 s 4.