City profile
Union, MO
Franklin County · Population 12,781
Union is a town in Franklin County, MO with about 12,781 residents and a typical home value near $205,000. It is 45 miles from St. Louis, MO, which shapes its climate, healthcare access and amenities.
Climate
Climate type
Four seasons
Winter avg
33°F
Summer avg
80°F
Sunny days / yr
205
Home prices & cost of living
Median home price
$205,200
Typical monthly housing
$1,280
Cost of living (100 = U.S.)
88
Taxes
- Property tax
- 0.97%
- State income tax (top)
- 4.7%
- Social Security
- Not taxed
- Pensions
- Partly exempt
- Sales tax (state + avg. local)
- 8.39%
FEMA natural hazard risk
Relatively Moderate · county score 84/100
Top hazards: Strong wind, Heat wave, Earthquake
Nearest major airport
40 mi to St. Louis Lambert International Airport (STL)
Political lean (2024 county vote)
Leans Republican · 27% Democratic / 72% Republican
Community
Population
12,781
Black population
2.2%
County
Franklin County
Detailed crime figures are available for our 201 hand-researched cities.
2025–2026 trends
2026 market trends
- ▸Home prices are still rising in 2026 — good for long-term value, less room to negotiate
- ▸Climate/cost risks to check: tornadoes
Highlights
- About 12,781 residents
- Typical home value about $205,000
- 45 miles from St. Louis, MO
Trade-offs
- Smaller community with fewer local amenities
- Scores for this place are estimated from Census data and the nearest major city
Figures are estimates from public sources (see How we match). Verify before making decisions.