ZIP Codes of Mason County, WA

Population & People
Population & People
Total Population
66,064
Household Income
Household Income
Median Income
$88,463
Housing
Housing
Total Housing Units
33,042
Business & Economy
Business & Economy
Total Businesses
1,051
Employment
Employment
Employment Rate
46.41%
Education
Education
Bachelor's Degree+
22.12%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 9 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:9 ZIP Codes (9 Standard, 0 PO Box, 0 Unique) [See All]
Area Codes:360 / 564
Timezone:Pacific (GMT -08:00)
Local Time:11:55:36 PM
Population:66,064 [See All]
FIPS:53045
CBSA:Shelton, WA
Land Area:981 sq mi
Water Area:91 sq mi
Coordinates:47.3949, -123.0863
Quick Link:
https://www.zip-codes.com/county/wa-mason.asp
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Washington's longest commutes
37-minute average travel time to work.
Striking education divide
Bachelor's share spans 8.7% to 48.2% — a 40-point gap.

Standout ZIPs in this County


Most Populous
Shelton · 40,606 people
61.5% of county total
Highest Income
Union · $138,370 median
1.6× county average
Largest Land Area
Hoodsport · 369.0 sq mi
Spans the most ground
Fastest Growth
Union · 36.3% (10-yr)
1,511 → 2,059 residents
Most Educated
Union · 48.2% bachelor's+
906 of 1,879 adults 25+

Things worth knowing about Mason County


66,064 residents live across 9 ZIPs covering 981 sq mi, served by 9 distinct USPS-recognized cities.

Population moved from 58,698 to 66,064 from 2014 to 2024 — a +12.5% change. 4 ZIPs gained residents, 5 lost.

The county's wealthiest ZIP 98592 (Union, $138,370 median) and poorest ZIP 98588 (Tahuya, $61,975) are 8.3 miles apart — a 2.2× income gap across local geography.

Median home values vary 1.8× across this county — from $315,000 in 98548 (Hoodsport) to $558,400 in 98592 (Union).

Density varies 95× across the county — from 6 people/sq mi in 98548 (Hoodsport) to 559 in 98524 (Allyn).

Educational attainment ranges from 8.7% bachelor's+ in 98588 (Tahuya) to 48.2% in 98592 (Union) — the breadth of educational profiles across the area.

Within Washington, this is the #20 most populous of 39 counties and ranks #12 for median household income with the #18 fastest decade growth .

Weighted by population, the typical household earns about $83,912 across the county — reflecting what a typical resident sees, not a simple ZIP average.

22.1% of adults age 25+ hold a bachelor's degree or higher (10,815 of 48,890 reporting).

9 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Mason County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
981
square miles
Avg density
67.4
people per sq mi
Population
66,064
across 9 ZIPs
Hoodsport
369.0 sq mi
2,177 residents
Shelton
360.9 sq mi
40,606 residents
Belfair
73.5 sq mi
11,940 residents

Single-ZIP anchor

One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.

Shelton

All ZIP Codes in Mason County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
98584SheltonStandard40,606$78,610360.912.9%
98528BelfairStandard11,940$91,05873.528.6%
98524AllynStandard4,300$99,4837.723.4%
98546GrapeviewStandard2,430$97,15934.5-27.6%
98548HoodsportStandard2,177$68,452369.0-8.9%
98588TahuyaStandard2,114$61,97548.6-2.4%
98592UnionStandard2,059$138,37017.036.3%
98555LilliwaupStandard32421.5-3.6%
98560MatlockStandard114$72,59648.1-43.3%

Adjacent & Nearby Counties