The increase was formally proposed by Seattle Mayor Ed Murray, and his spokesman said he intends to sign the ordinance on Tuesday.
Washington already has the nation’s highest state-level minimum wage, at $9.32. That rate also applies to the city.
The current federal minimum wage is $7.25, and Democrats in Congress have been pushing for a gradual increase to $10.10, but so far to little effect.
The increase to $15 in Seattle will take place over several years based on a scale that considers the size of and benefits offered by an employer. It will apply first to many large businesses in 2017 and then to all businesses by 2021.
The first increase, on April 1, 2015, brings the minimum wage to $10 for some businesses and $11 for others.
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