Mason County ZIP Codes
Washington, United States · 9 codes
Mason County in Washington has 9 ZIP codes, from 98524 to 98592, serving 9 places.
ZIP codes in Mason
Frequently asked questions
What is the ZIP code of Mason?
Mason has 9 ZIP codes, from 98524 to 98592. The table lists the places each one serves.
How many places are listed in Mason County?
9 places.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.