I live in Washington State too--you are absolutely correct. I have not been here for 30 years, but long enough to see that everything you are saying is true. I hear a lot of women complaining about the lack of black men here, and I see for myself ( like you ) that they almost exclusively date white or other women.
I meet a lot of blacks from all over the country that move here, and we all agree that we had culture shock when coming here in more ways than one. I don't date men, so I do not have this issue, but I am fully aware of it.
It is a totally different culture up here--and no census report makes any difference to me. I hear people often refer to blacks up here not being 'real blacks' for many reasons. From what I see and experience, a lot of things up here are really just cultural.
There are things I love about Wash State and things I absolutely hate--but, I know I am where I am suppose to be at least for this time in my life. No matter where I've lived, I've had issues and complaints. Such is life..