Love this prompt! Born & raised Portlander here, I'll corroborate The Dead Moon answer. Fred and Toody are beloved bastions of the punk community and have contributed so much-not only through their own music, but through institutions like Captain Whizeagle's, and supporting local music scenes/makers in countless other ways.
The Rats are also way up there for me. On some days I even like them better.
Also The Wipers, a group with a sound both distinctive and emblematic of a dark, slightly off kilter and almost dreamlike quality that I associate with a lot of Portland bands.
My Dad was a fixture of the Portland punk scene in the 80's and the name Poison Idea was uttered with utmost reverence in our house. Also Dean was a regular at this restaurant i used to work at. He was very cool and nice and I wish i would have pestered him for more stories. The influence of "Pick Your King" etc. Can't really be overstated.
Lastly, Neo Boys. Not because they are particularly flashy or face-ripping, but they have a raw melodic potency that touches my heart.