There are 9 zip codes in Mason County, Washington. The most populated is 98584, located in Shelton. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
98584Shelton38,615
98528Belfair12,393
98524Allyn4,226
98546Grapeview2,965
98548Hoodsport2,593
98592Union1,848
98588Tahuya1,564
98555Lilliwaup238
98560Matlock76

Mason County, Washington Zip Codes by Population (2024)