Union is a city in Franklin County, Missouri, home to about 12,781 people across 9.0 square miles. Its ZIP code is 63084.
Homes sold for a median of $190 per square foot in the three months ending August 2026, a seller’s 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
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 | St. Louis Lambert International Airport (STL)41 miles away |
|---|---|
| Nearest city of 250,000+ | St. Louis, MO44 miles away |
| Nearest city of 1 million+ | Chicago, IL293 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 12,348 residents in the 2020 census, up 59% since 2000.
It’s the 73rd largest of 1,060 towns in Missouri by population.
Franklin County grew from 30,581 residents in 1900 to 104,682 in 2020.
Franklin County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 91°F in summer, and winter lows average 23°F. About 45 inches of rain and melted snow fall in a typical year, with about 14 inches of snow.
Source: NOAA 1991–2020 climate normals, Union, MO weather station (about a mile away).
35,466 jobs at 2,702 businesses in Franklin County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
153 doctors and other health care providers list an office in Union.
Nearest hospitals
Providers with an office here
| Primary care doctors | 12 |
|---|---|
| Dentists | 9 |
| Nurse practitioners and physician assistants | 15 |
| Mental health providers | 83 |
| Physical and occupational therapists | 13 |
| Optometrists | 7 |
| Chiropractors | 14 |
| Pharmacies | 7 |
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 (7 nearby)
Grocery stores (2 nearby)
Pharmacies (3 nearby)
Libraries (1 nearby)
Museums (1 nearby)
Counts are within about 2 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 Union R-Xi, Mo Schls for the Sev Disabled, Washington. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Beaufort Elem.Beaufort | Pre-K–5 | 322 | Public | 6.5 mi |
| Central Elem.Union | Pre-K–5 | 643 | Public | 0.7 mi |
| Prairie Dell ElementaryUnion | Pre-K–5 | 495 | Public | 3.0 mi |
| Autumn Hill SchoolUnion | K–12 | 32 | Special Education | 0.3 mi |
| Clearview ElementaryUnion | K–6 | 295 | Public | 2.2 mi |
| Union MiddleUnion | 6–8 | 704 | Public | 0.4 mi |
| Union HighUnion | 9–12 | 956 | Public | 0.5 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Immaculate Conception SchoolUnion | Pre-K–8 | 183 | Roman Catholic | 0.6 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.
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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.