Union is a city in and the county seat of Franklin County, Missouri, United States. It is located on the Bourbeuse River, 50 miles (80 km) southwest of St. Louis. The population was 12,348 at the 2020 census.

Official town website ↗

From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

How Union ranks

All →

#4Rent easiest to afford in MO #21Fastest growing in MO #20Most new homes in MO All MO rankings →

Town numbers

ZIP code63084

Area code636

Living in Union

Housing in Union

$260K▲ 4.8% in a year Typical home value · Zillow

The typical Union home is worth about $260,000, up 4.8% in a year, close to the Missouri typical home.

A seller's market

Buyer’sBalancedSeller’s

Days on market29

Sale-to-list99.7%

Sold in May19

Zillow Home Value Index · Redfin Data CenterHousing market →

Safety in Union

C⁻

Safety Grade C-

Union reports more crime per resident than most U.S. towns we grade: about 85% report less.

Violent crime per 1,000

Union 4.1

Missouri 4.3

U.S. 3.3

Property crime per 1,000

Union 22.5

Missouri 16.9

U.S. 15.5

FBI crime data, 2025 · crimes reported to policeCrime & safety →

Work & commute in Union

Full picture →

Most working residents leave Union for work: only 18% work in town. The top destinations are Washington (12%), St. Louis (5%) and Pacific (3%). Half commute less than 25 miles.

Washington

12%

St. Louis

Pacific

St. Clair

18%Work in townlive and work in Union 25 miWhere do people commute?the commute map 6,096Jobs based herebalanced

Census LEHD 2023 · ACSWork & commute in Union →

Health in Union

C⁺

Health Grade C+

Healthier than 42% of U.S. towns on seven CDC estimates.

Compared with Missouri

3better than MO

of 32 measures CDC estimates. The other 29 are too close to call.

Conditions 3▲ 9 close Habits all close Care all close Mind all close Everyday needs all close

BetterToo close to callWorse

What stands out

10.3%Fewer adults with diabetesMO 12.1% · better 3.1%Fewer adults who have had a strokeMO 3.6% · better

Care nearby

Mercy Hospital WashingtonWashington · 7.9 mi · ER

Compass HealthUnion · 1.6 mi · sliding-scale fees

Primary careShortage · county-wide

DentalShortage · county-wide

Mental healthShortage · county-wide

CDC PLACES 2025 · modeled estimates for adults · CDC's estimate for Union · CMS · HRSAHealth in Union →

Natural hazards in Union

High

Expected storm and flood damage is higher than in 64% of U.S. communities.

🌊 Inland flooding🏚️ Earthquakes🌪️ Tornadoes

27Does Union flood?paid flood claims since 1979 6Disasters that paid out herefederal disasters sent FEMA money to Union

FEMA National Risk Index December 2025 · OpenFEMANatural hazards in Union →

Climate in Union

Full climate →

Union has chilly winters and warm summers. A typical July afternoon reaches 89°, a January night drops to 22°, and about 14 inches of snow falls in a normal winter.

44° / 24°Winter

67° / 44°Spring

87° / 65°Summer

69° / 45°Fall

How much snow does Union get?About 14 inches a winter.Rain & snow →When is the first frost?Around Oct 23, with the last in spring around Apr 11.Frost dates →Is it warmer than it used to be?+0.9° vs. the 20th century.Then & now →

NOAA U.S. Climate Normals, 1991–2020Climate in Union →

Schools in Union

All Union schools →

B⁻

School Grade B-

The public schools Union’s kids attend, from kindergarten through graduation, outperform 50% of Missouri’s districts on state tests and graduation. Among towns with similar incomes, they sit near the middle.

See how Union’s schools compare in MO →

DistrictUNION R-XISchools6

Central Elem. C+Elementary · Grades PK–5 · 643 students Prairie Dell Elementary B+Elementary · Grades PK–5 · 495 students Immaculate Conception SchoolElementary · Grades PK–8 · 217 students Union Middle BMiddle · Grades 6–8 · 704 students Union High B-High · Grades 9–12 · 956 students Autumn Hill School DOther · Grades K–12 · 32 students

School data from the U.S. Department of Education (NCES, EDFacts). The School Grade is our own summary of state test results and graduation rates, graded within MO. Ratings are from neighbors.