RAINIER, Ore.—Washington residents are pouring over the Oregon line this summer to buy liquor after Washington state privatized the sale of hard alcohol—and made the booze more expensive by raising state fees.

Sales at Rainier Liquor Store, the lone liquor outlet in this town of 2,000 residents, are running $2,000 a day higher than last summer, said proprietor Traci Brumbles. Every day "is like a holiday" now, she said.

Ms....