Seattle (which I just moved about 80 miles north from in November) is home to a number of game companies, including WoTC, as well as surprisingly large Penny Arcade Expo, but, for pen-and-paper gaming, it's not exactly what I'd call 'vibrant.' There are literal boatloads of pen-and-paper gamers around Seattle, but there is little to no sense of community.
Some blame the lack of decent, centrally located game stores, but I think it has more to do with the way the area is divided up more between 'cities within a city,' like Bellevue, Kirkland, Ballard, and so on, as well as the different parts of Seattle proper; to get from one part of the area to another, you have to go through the narrow passage between the lake and the harbor, which happens to be where downtown and its associated traffic is nestled. Sure, a lot of people travel through the morass to get to and from work, but a lot of people simply avoid leaving their area on their days off.
Now, none of that is a problem if you're going to the UW (which I assume is the Seattle-area school that wants you). As far as I know, it's got a fairly large geek population, and, where there are geeks--in this state at least--there are gaming groups.