Washington Revised Code Title 4. Civil Procedure § 4.92.010. Where brought--Change of venue

(1) The county of the residence or principal place of business of one or more of the plaintiffs;

(2) The county where the cause of action arose;

(3) The county in which the real property that is the subject of the action is situated;

(4) The county where the action may be properly commenced by reason of the joinder of an additional defendant; or

(5) Thurston county.

Actions shall be subject to change of venue in accordance with statute, rules of court, and the common law as the same now exist or may hereafter be amended, adopted, or altered.

Actions shall be tried in the county in which they have been commenced in the absence of a seasonable motion by or in behalf of the state to change the venue of the action.