Paul, you raise many points important at both the local and national level.  You are right, I believe, that extreme individualism without a cooperative approach isn't productive.  However, I'd say Oregon's traditional individualism does include a strong  sense of community going back to pioneer times, especially  "loyalty to friends."  While every individual is expected to do one's best, friends and neighbors are quick to pitch in when trouble arises.
I was blessed to have grown up in small towns in Oregon and I recall that community spirit fondly.  This usually led to a strong sense of "team spirit", as we see reflected in the battles over school mascots.  In fact, the downside is the tendency to be "robust against foes", which can lead to hostility towards outsiders or those who are different.
But you have asked a key question: "What do Oregonians have in common?" Ah, that's another story!