Union is a township in Houston County, Minnesota, home to about 263 people across 26 square miles. It has no ZIP code of its own: it’s part of 55921 and 55941.
Homes sold for a median of $192 per square foot across 2 ZIP codes in the three months ending August 2026, and 1 of 2 were seller’s markets.
Mostly Caledonia City; part is in Union
Mostly Hokah City; part is in Union
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.
Are you a local agent who knows Union well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field (MSP)122 miles away |
|---|---|
| Closer regional airport | La Crosse Regional Airport (LSE)19 miles away |
| Nearest city of 250,000+ | Madison, WI109 miles away |
| Nearest city of 1 million+ | Chicago, IL229 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 324 residents in the 2020 census, down 16% since 2000.
It’s the 1590th largest of 2,727 towns in Minnesota by population.
Houston County grew from 15,400 residents in 1900 to 18,843 in 2020.
Houston County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 81°F in summer, and winter lows average 8°F. About 38.4 inches of rain and melted snow fall in a typical year, with about 45 inches of snow.
Source: NOAA 1991–2020 climate normals, Caledonia, MN weather station (2 miles away).
4,309 jobs at 394 businesses in Houston County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
14 doctors and other health care providers list an office in Union’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 2 |
|---|---|
| Dentists | 3 |
| Nurse practitioners and physician assistants | 2 |
| Mental health providers | 3 |
| Chiropractors | 4 |
| Pharmacies | 3 |
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 (4 nearby)
Libraries (1 nearby)
Counts are within about 3.5 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.
Public schools here are run by Caledonia Public School District, Hiawatha Valley Education District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Caledonia ElementaryCaledonia | Pre-K–5 | 295 | Public | 2.1 mi |
| HVED Spectrum ProgramHokah | Pre-K–12 | 14 | Special Education | 9.6 mi |
| Houston County JDC SchoolCaledonia | 4–12 | 1 | Alternative Education | 1.8 mi |
| Caledonia MiddleCaledonia | 6–8 | 138 | Public | 2.4 mi |
| Caledonia Senior HighCaledonia | 9–12 | 259 | Public | 2.4 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| St John's Evangelical Lutheran SchoolCaledonia | Pre-K–8 | 75 | Wisconsin Evangelical Lutheran Synod | 1.7 mi |
| St Marys Catholic SchoolCaledonia | Pre-K–8 | 109 | Roman Catholic | 1.8 mi |
| St Peter's Catholic Elementary SchoolHokah | Pre-K–8 | 38 | Roman Catholic | 10.1 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
Buying or selling around Union? Tell us what you need and when. No agents advertise here yet, so we’ll keep your request for up to 30 days and send it to local agents who join. No obligation, and you choose who to work with.
Loading map…
Shares ZIP codes with Caledonia City, Hokah City, Caledonia Township, Mayville, Sheldon, Brownsville Township, Wilmington, Winnebago Township, Hokah Township, Crooked Creek, Jefferson and Mound Prairie.
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.