The principal location of the private investigator licensing program is at 405 Black Lake Boulevard SW, Olympia, Washington 98504. The department of licensing administers the Washington private investigator license law, chapter 18.165 RCW. Submissions and requests for information regarding private investigative agency licenses, private investigator licenses, and armed private investigator licenses may be sent in writing to the Private Investigator Program, Department of Licensing, P.O. Box 9045, Olympia, Washington 98507-9045.