"Of the people living Seattle itself, only 37% were born in WA, 44% another state, and 19% another country according to the 2006 census." http://www.city-data.com/forum/seattle-area/281766-transplan...
http://factfinder.census.gov/servlet/NPTable?_bm=y&-geo_id=1...
All those demographics are on wiki: Vancouver is 40 % asian (and like 25% Chinese) which we all know, San Francisco is 33% asian but only 6% black (not counting Oakland I guess, but we aren't counting Tacoma for Seattle either). New York is New York.
I have no idea where you get saying they are segregated, at least when it comes to asian. Black is more urban, but that's hardly surprising (unless we want to start talking about seatac and Tacoma, which are different cities).