Definitely not, Seattle is more white and gave Clinton a larger margin (a first!).
I think it's between Seattle (~88-8.44) and DC.
Ok---- slight long shot, but I'll throw it out, now that I've been crunching some Oregon numbers....
Assuming the original question refers to non-Latino Whites
Portland Oregon is 72% non-hispanic White vs Seattle's 66% non-hispanic White.
Portland---- (78-13 Clinton-Trump) for +65% Clinton, which is likely a new Democratic Presidential candidate record for the Rose City....
It certainly looks like Portland beat the SFC for "Non-Latino White Clinton support"), unless Whites voted much more heavily Democratic than Asian-Americans in the City by the Bay.