Union is a community in Mason County, Washington, home to about 457 people across 1.6 square miles. It has no ZIP code of its own: it’s part of 98592.
Homes sold for a median of $281 per square foot in the three months ending August 2026, a balanced market.
Each card is that ZIP code’s whole market, including any part outside Union. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Seattle–Tacoma International Airport (SEA)37 miles away |
|---|---|
| Closer regional airport | Tacoma Narrows Airport (TIW)24 miles away |
| Nearest city of 250,000+ | Seattle, WA39 miles away |
Straight-line distances from the center of Union; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Union had 683 residents in the 2020 census, up 8% since 2010.
It’s the 485th largest of 628 towns in Washington by population.
Mason County grew from 3,810 residents in 1900 to 65,726 in 2020.
Mason County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 76°F in summer, and winter lows average 35°F. About 91.9 inches of rain and melted snow fall in a typical year, with about 4 inches of snow.
Source: NOAA 1991–2020 climate normals, Cushman Powerhouse #2, WA weather station (5 miles away).
10,138 jobs at 1,072 businesses in Mason County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
3 doctors and other health care providers list an office in Union.
Nearest hospitals
Providers with an office here
| Specialist doctors | 1 |
|---|---|
| Mental health providers | 1 |
| Chiropractors | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Grocery stores
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.