There are a lot of white people that is for sure but if there was an accurate way to measure the true number of immigrants than Portland would be something like 60/40 or 65/35 white. Not as diverse as say Atlanta or Charlotte, but still pretty diverse, however looking at other cities I expected to be super white you seem to be right.
P.S. checked Boston only 54% white.
White Alone: (First number Porltand metro, second Oregon as a whole)
76.1% (Portland)/83.6% (Oregon as a whole)
Black or African American alone, percent, 2010 (a)
6.3%/1.8%
American Indian and Alaska Native alone, percent, 2010 (a)
1.0%/1.4%
Asian alone, percent, 2010 (a)
7.1%/3.7%
Native Hawaiian and Other Pacific Islander alone, percent, 2010 (a)
0.5%/0.3%
Two or More Races, percent, 2010
4.7%/3.8%
Hispanic or Latino, percent, 2010 (b)
9.4%/11.7%
If you can't trust the census, who can you trust?