Washington Revised Code Title 29A. Elections § 29A.04.210. Registration required--Exception

(1) At any election held for the purpose of electing persons to public office;

(2) At any recall election of a public officer;

(3) At any election held for the submission of a measure to any voting constituency;

(4) At any primary election.

This section does not apply to elections where being registered to vote is not a prerequisite to voting.