Washington Revised Code Title 48. Insurance § 48.29.040. May do business in two or more counties--Restrictions

(1) Subject to the deposit requirements of *RCW 48.29.030, a title insurer having its principal offices in one county may be authorized to transact business in only such additional counties as to which it owns or leases and maintains, or has a duly authorized agent that owns or leases and maintains, a complete set of tract indexes.

(2) A title insurer not authorized to transact business in a certain county may purchase a title policy on property located therein from another title insurer which is so authorized in that county. The first title insurer may thereafter issue its own policy of title insurance to the owner of such property. The first title insurer may combine the insurance on the title of such property in a single policy which also insures the title of one or more other pieces of property. The first title insurer must pay the full premium based on filed rates for the policy, and must charge the precise same amount to its own customer for the insurance as to the title of such property. A title insurer using the authority granted by this subsection in a transaction must so notify its customer.