Alas, I am not aware of any organized JO groups currently operating in PDX. I assume there are a few private gatherings here and there, but they’re usually hard to find and often prone to problems.
If anyone in Portland wanted to start up a Jacks club there, I would be honored to assist. I see many Portland area members at my club up here in Seattle. While I’m flattered, it shouldn’t be such a hassle for a progressive and sex-positive area. I’m fairly certain it would not take a lot to get the Jacks rolling down there. It just takes one motivated individual to make it happen.