Lithuania is largest Baltic state with a population of just under 3 million. Of that population, roughly 0.15% have put down roots in the Seattle area. The relatively small numbers are outsized by the pride, sense of community, and organization of local Lithuanians. If you are lucky enough to work with or meet a Lithuanian in Seattle, invite them for coffee and ask them to tell you their story.
There is a long established summer camp in Western WA for the kids local Lithuanian families.
There is a Baltic American Chamber of Commerce in New York, but no activity distinct to the Pacific NW. More research is required to complete this profile.