City profile
O'Fallon, MO
St. Charles County · Population 93,801
O'Fallon is a city in St. Charles County, MO with about 93,801 residents and a typical home value near $326,000. It is 31 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
$326,200
Typical monthly housing
$2,036
Cost of living (100 = U.S.)
109
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 93/100
Top hazards: Strong wind, Hail, Tornado
Nearest major airport
19 mi to St. Louis Lambert International Airport (STL)
Political lean (2024 county vote)
Leans Republican · 41% Democratic / 58% Republican
Community
Population
93,801
Black population
5.3%
County
St. Charles 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 93,801 residents
- Typical home value about $326,000
- 31 miles from St. Louis, MO
Trade-offs
- 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.