Wash. Rev. Code § 46.72.020
No for hire operator shall cause operation of a for hire vehicle upon any highway of this state without first obtaining a permit from the director of licensing, except for those for hire operators regulated by cities or counties in accordance with chapter 81.72 RCW. Application for a permit shall be made on forms provided by the director and shall include (1) the name and address of the owner or owners, and if a corporation, the names and addresses of the principal officers thereof; (2) city, town or locality in which any vehicle will be operated; (3) name and motor number of any vehicle to be operated; (4) the endorsement of a city official authorizing an operator under a law or ordinance requiring a license; and (5) such other information as the director may require.
RCW 46.72.020