Well, I was referring to its geographic location but if you mean the Microsoft/Amazon types think of it as “eastern” WA I believe you. Looking at a map is probably not in their repertoire.
The demarcation between eastern and western WA and OR, culturally, demographically, politically, climatically, geologically, anything you can think of, has always been the north-south Cascade range, even though the range does not lie equidistant from the western (Pacific) and eastern borders of the states.