There are numerous JKD schools and academies in Seattle, just google it.
A recommendation from me, someone who I have trained with is Andy Wilson and his "MKG Seattle" school, which is in the Metropolitan area. Andy is an Instructor under Guro Dan Inosanto, Rick Faye, Master Chai, Erik Paulson etc etc and is an excellent instructor. He teaches Jun Fan Gung Fu / Jeet Kune Do at his school, amidst many other arts:
www.mkgseattle.com
Thats one option for you.