Mason County, WA ZIP codes
There are 9 ZIP codes in Mason County, WA, in 9 towns, from 98524 to 98592. The largest are 98584 (Shelton), 98528 (Belfair) and 98524 (Allyn). 1 more crosses into it from a neighbouring county: 98541.
The county seat is Shelton.
- ZIP codes
- 9
- Partly in it
- 1 more
- Towns
- 9
- County seat
- Shelton
- County FIPS
53045- State
- Washington
- Population
- 67,982
- Median household income
- $83,270
- Land area
- 960 sq mi
- Area code
- 360
- Metro area
- Shelton
Mason County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
ZIP codes partly in Mason County
This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Mason County.
- 98541 Elma · mostly in Grays Harbor County
Map of Mason County ZIP codes
The ZIP codes of Mason County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Mason County in numbers
About 67,982 people live in Mason County, in 26,029 households, the 20th most populous of Washington's 39 counties. The median household income is $83,270 a year, 15% below the Washington median of $98,141 (US: $80,734). The median owner-occupied home is valued at $411,800 (27% below the Washington median), and median gross rent is $1,285 a month. The median age is 44.7; 21.9% of adults 25 and over hold a bachelor's degree or higher (39.6% across Washington); the average commute takes 36 minutes.
| Population | 67,982 |
|---|---|
| Households | 26,029 |
| Median age | 44.7 |
| Median household income | $83,270 |
| Median home value | $411,800 |
| Median gross rent | $1,285 |
| Bachelor's degree or higher | 21.9% |
| Mean commute | 36.1 min |
| Population density | 71 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Mason County
| Town | ZIP codes | Population |
|---|---|---|
| Shelton | 1 | 10,612 |
| Belfair | 1 | 4,557 |
| Allyn | 1 | 2,404 |
| Tahuya | 1 | 2,114 |
| Grapeview | 1 | 1,088 |
| Union | 1 | 457 |
| Lilliwaup | 1 | 324 |
| Hoodsport | 1 | 216 |
| Matlock | 1 | 114 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Mason County.
Not sure you are in Mason County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Mason County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
98524 | Allyn , WA | Standard | 4,300 | $99,483 | $526,800 |
98528 | Belfair , WA | Standard | 11,940 | $91,058 | $430,200 |
98546 | Grapeview , WA | Standard | 2,430 | $97,159 | $494,500 |
98548 | Hoodsport , WA | Standard | 2,177 | $68,452 | $315,000 |
98555 | Lilliwaup , WA | Standard | 324 | — | $462,500 |
98560 | Matlock , WA | Standard | 114 | $72,596 | $526,300 |
98584 | Shelton , WA | Standard | 40,606 | $78,610 | $393,000 |
98588 | Tahuya , WA | Standard | 2,114 | $61,975 | $336,300 |
98592 | Union , WA | Standard | 2,059 | $138,370 | $558,400 |
Cite this page
zipcodes.pro. “Mason County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/wa/county/mason
Underlying data is public domain or openly licensed — sources, vintages and licences.