OrigamiUSA is the American national origami society. It offers origami resources via their website, magazines, online shop and conventions. Their website has a link to other origami groups, both in U.S. regional and International.
Portland Oregon Paper Shapers is the local origami group in Portland, Oregon. It is a casual group that meets on every second Sunday afternoons at Belmont Library, as well as on every third Sunday afternoons at Tualatin Public Library.