I'm in Los Angeles and running into the same problem with a twist.
The poly community here seems to be small but also much older. I'm 25 and if I wanted to date within the community I've been able to find so far, I'd have to go for someone at least twice my age. There is nothing intrinsically wrong with that, but its not what I'm looking for.
I had thought I would be tripping over poly people out here but they seem to be pretty rare.