City profile
Affton, MO
St. Louis city · Population 19,052
Affton is a town in St. Louis city, MO with about 19,052 residents and a typical home value near $212,000. It is 9 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
$212,400
Typical monthly housing
$1,325
Cost of living (100 = U.S.)
89
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 High · county score 99/100
Top hazards: Heat wave, Hail, Lightning
Nearest major airport
14 mi to St. Louis Lambert International Airport (STL)
Political lean (2024 county vote)
Leans Democratic · 81% Democratic / 17% Republican
Community
Population
19,052
Black population
3.2%
County
St. Louis city
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 19,052 residents
- Typical home value about $212,000
- 9 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.