I am looking for an answer to this question. I grew up in Washington State, but am going to school in the State of Arizona. I have a physical residence in AZ and my ID's, plates, etc. are from AZ. So for all intents and purposes my residency is Arizona. I do normally return to Washington during the summer months as my family lives there and I will again this summer, but the difference is my family no longer resides at the WA address, and I will be getting a place of my own. The WA CPL requirement is that I need to be a WA resident or wait 90 days. Can I still claim WA residence? I can prove I have lived in WA and that I intend to establish a "home". It is also possible I will return to WA permanently after my schooling ends. (If WA had reciprocity with AZ I wouldn't worry about it) and I want the WA CPL because of the silly car carry rule. Carry on!
It's pretty much a moot point. You are slightly mistaken on the wait time requirements for the CPL:
Concealed pistol license — Application — Fee — Renewal.
(1) The chief of police of a municipality or the sheriff of a county shall within thirty days after the filing of an application of any person, issue a license to such person to carry a pistol concealed on his or her person within this state for five years from date of issue, for the purposes of protection or while engaged in business, sport, or while traveling. However, if the applicant does not have a valid permanent Washington driver's license or Washington state identification card or has not been a resident of the state for the previous consecutive ninety days, the issuing authority shall have up to sixty days after the filing of the application to issue a license.
You won't have a Washington driver's license or ID card, and even if you did, you would not be able to prove residency for the previous 90 consecutive days, so you will have to wait up to 60 days for your CPL after you apply.
You don't need to be a resident of Washington to get the CPL, so, if you can make a trip to Washington at any time, you can apply for your CPL (you do have to apply in person) while you are still a resident of Arizona.