In mail ballots counted May 17, workers at four Portland Starbucks stores voted to unionize with Workers United, two of them by unanimous vote: 2880 SE Powell Blvd. 14-2 555 SW Oak St. 5-0 2328 W Burnside St. 7-2 525 NE Grand Ave. 9-0. The votes mean Oregon now has 11 union Starbucks locations.