Union is a town in Knox County, Maine, home to about 2,663 people across 32 square miles. Its ZIP code is 04862.
Homes sold for a median of $246 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Union; also Appleton
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
We’re writing up Union’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Portland International Jetport (PWM)67 miles away |
|---|---|
| Closer regional airport | Knox County Regional Airport (RKD)16 miles away |
| Nearest city of 250,000+ | Boston, MA159 miles away |
| Nearest city of 1 million+ | New York, NY344 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 2,383 residents in the 2020 census, up 8% since 2000.
It’s the 136th largest of 519 towns in Maine by population.
Knox County grew from 30,406 residents in 1900 to 40,607 in 2020.
Knox County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 77°F in summer, and winter lows average 12°F. About 56.3 inches of rain and melted snow fall in a typical year, with about 69 inches of snow.
Source: NOAA 1991–2020 climate normals, W Rockport 1 Nnw, ME weather station (8 miles away).
14,502 jobs at 1,823 businesses in Knox County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
16 doctors and other health care providers list an office in Union.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Dentists | 1 |
| Mental health providers | 10 |
| Physical and occupational therapists | 4 |
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.
Parks (2 nearby)
Grocery stores (1 nearby)
Libraries (2 nearby)
Museums (2 nearby)
Counts are within about 4 miles 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.
Established in 1786.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Appleton Public Schools, Rsu 40/Msad 40. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Appleton Village SchoolAppleton | Pre-K–8 | 132 | Public | 0.9 mi |
| Union ElementaryUnion | Pre-K–6 | 125 | Public | 3.7 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Appleton.
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.