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
Population
City
9858438,615Shelton
9852812,393Belfair
985244,226Allyn
985462,965Grapeview
985482,593Hoodsport
985921,848Union
985881,564Tahuya
98555238Lilliwaup
9856076Matlock

Zip Codes in Mason County, Washington by Population (2024)