RCW 19.80.010: Registration required.

Each person or persons who carries on, conducts, or transacts business in this state under any trade name must register that trade name with the department as provided in this section.

(1) Sole proprietorship or general partnership: The registration must set forth the true and real name or names of each person conducting the same, together with the post office address or addresses of each such person and the name of the general partnership, if applicable.

(2) Foreign or domestic limited partnership: The registration must set forth the limited partnership name as filed with the office of the secretary of state.

(3) Foreign or domestic limited liability company: The registration must set forth the limited liability company name as filed with the office of the secretary of state.

(4) Foreign or domestic corporation: The registration must set forth the corporate name as filed with the office of the secretary of state.

(5) Other business entities: The registration must set forth the entity's name as required by the department.