Mason County, Washington ZIP codes
9 ZIP codes are in Mason County, plus 6 that cross in from neighboring counties. It's part of the Shelton, WA micro area.
- ZIP codes
- 9
- Population in these ZIPs
- 66,064
- Avg. median income
- $83,900population-weighted
- Cities & towns
- 9
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Mason County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 98524 | Allyn | 4,300 | $99,483 | $532,700 |
| 98528 | Belfair | 11,940 | $91,058 | $483,200 |
| 98546 | Grapeview | 2,430 | $97,159 | $616,500 |
| 98548 | Hoodsport | 2,177 | $68,452 | $347,600 |
| 98555 | Lilliwaup | 324 | — | $365,200 |
| 98560 | Matlock | 114 | $72,596 | $526,300 |
| 98584 | Shelton | 40,606 | $78,610 | $418,800 |
| 98588 | Tahuya | 2,114 | $61,975 | $431,500 |
| 98592 | Union | 2,059 | $138,370 | $513,900 |
ZIP codes partly in Mason County
These ZIP codes are mostly in a neighboring county but cover part of Mason County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 98312 | Bremerton | Kitsap County | 36,307 | $90,449 | $494,700 |
| 98380 | Seabeck | Kitsap County | 5,471 | $125,229 | $699,300 |
| 98502 | Olympia | Thurston County | 35,398 | $92,207 | $567,700 |
| 98541 | Elma | Grays Harbor County | 10,810 | $78,816 | $364,200 |
| 98557 | Mccleary | Grays Harbor County | 4,079 | $78,594 | $389,500 |
| 98563 | Montesano | Grays Harbor County | 7,604 | $84,634 | $382,600 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Mason County
Nearby counties
Frequently asked questions
How many ZIP codes are in Mason County, Washington?
9 ZIP codes are mainly in Mason County, and 6 more ZIP codes from neighboring areas reach partly into it.
What cities are in Mason County?
ZIP codes in Mason County use the city names Allyn, Belfair, Grapeview, Hoodsport, Lilliwaup, Matlock, Shelton, Tahuya and Union.
What metro area is Mason County in?
Mason County is part of the Shelton, WA micropolitan statistical area.