According to Hotel Workers Rising, a campaign of UNITE HERE!, the following Portland, Oregon hotels have unionized workers (direct link):

Portland Hilton
921 SW Southwest 6th ave
Portland, OR 97204

The Benson Hotel
309 SW Broadway
Portland, OR
Phone: 503-228-2000

The Paramount Hotel
808 SW Taylor
Portland, OR 97205
Phone: 503-223-9900

The Hilton is an official UUA hotel. I think it’s where I stayed in Portland on Day Job Business and liked it very much: not unreasonably priced, either.

GLBT readers note SleepWithTheRightPeople.org, “an alliance of the LGBT community and UNITE HERE!” for more information and (I think) a perfectly fair and moderate tipping guide.