[xyhopguy]

For oregon the population center is almost exactly Detroit. There is a large population in the willamette valley south of portland (and bend is captured by this too).

[zie]

Assuming this is true, and it makes sense that it would be; Detroit is in the north west corner of the state, up near the WA border.

[xyhopguy]

Definitely is technically in the northwest part of the state, but I'm not sure I'd call it close to the Washington border.

It's much closer to Salem and Bend than it is Portland, for instance.