Hey from Portland Oregon

I'm in Portland but don't run enough/have time to be anyone's running partner. That said, try any of the running stores in town. I'm pretty sure they all have multiple running groups. I'm sure there are at least a handful of running Meetup groups as well. For example, Portland Running Company has eight group runs a week all of which are free.

edit: I'm sure they would also all have guidance on how to find a running partner if the groups wouldn't work for you (I wonder if any of them have lists of people wanting running partners).