I think the Pullman area may very well be nonreligious, but I don't think it's as nonreligious as my map shows. However, to get Washington to be 32% nonreligious, you need a lot of those types of areas to show up as green.
I can believe the alumni of WSU swinging Whitman, it's a pretty empty county outside of Pullman. But does CWU really swing Kittitas? CWU isn't that large of a school.
Whatcom County is also interesting. Bellingham is extremely non-religious, even outside of the WWU campus. But it gets counter-acted by the strong Dutch Reformist presence in Lynden, where all the businesses still close on Sundays.