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Affton, MO
Census-designated place in St. Louis County, Missouri. ZIP codes: 63123.
Population
19,052
Land area
4.6sq mi
People per sq mi
4,169
ZIP codes
1
Affton and its ZIP codes
Affton at a glance
- Affton is about 46 times as dense as Missouri as a whole.
- It is the 41st most populous of 1,062 cities and towns in Missouri.
- Households here earn a median of $79,539 a year, 12% more than the Missouri figure of $70,702.
- A typical owner-occupied home is valued at $212,400 (8% below Missouri) and median rent is $1,015 a month.
Local data for Affton, MO
Counts from official public data
Housing and community stats
Affton, MO, American Community Survey 2020-2024
Median household income
$79,539
Poverty rate
6.6%
Median home value
$212,400
Median rent
$1,015/mo
Homeownership
80.8%
Bachelor's or higher
36.6%
Median age
42.0
Average commute
23.5 min
Largest reported origins and ancestries: German Americans (5,792), Irish Americans (2,714), Italian Americans (1,201).
Economy and federal money
Jobs, pay, income and spending are for St. Louis County. PPP loans are for Affton.
Unemployment rate
4.2%
Aug 2026, -0.3 pts in a year
Average annual pay
$78,741
589,803 jobs, 2025
Income per person
$104,775
BEA, 2024
Federal spending
$15.55B
FY 2026, $15,488 per person
PPP loans
$136M
1,245 loans, 13,512 jobs reported
How people get to work
Affton, MO, workers 16 and older. American Community Survey 5-year estimates
- Drove alone77.1%
- Carpooled7.8%
- Public transit0.8%
- Walked0.7%
- Bicycle0.4%
- Taxi, ride-hailing, motorcycle or other1.5%
- Worked from home11.6%
Average one-way commute: 23.5 minutes for people who do not work from home.
Environment and hazard risk
Affton, MO, from FEMA, NOAA and EPA
Natural hazard risk
Relatively High
Top: heat wave
Storm events since 1996
1,321
Countywide, mostly hail
Flood insurance policies
2,070
0.6% of homes, county
July high / Jan low
90° / 25°F
43.9 inches of rain a year
Hazards, floods and storm historyCheck a flood zone1 historic places
Health statistics
Share of adults in Affton, MO, CDC PLACES estimates
Obesity
29.6%
U.S. 33.3% -3.7 pts
Diabetes
10.0%
U.S. 12.1% -2.1 pts
Smoking
14.3%
U.S. 12.8% +1.5 pts
Uninsured (18-64)
7.0%
U.S. 11.1% -4.1 pts
ZIP codes in Affton
1 in or overlapping Affton. Population shown
Cities near Affton
| Name | Distance | Land area (sq mi) |
|---|---|---|
| St. GeorgeCensus-designated place | 0.9 mi | 0.2 |
| LakeshireCity | 0.9 mi | 0.2 |
| Wilbur ParkVillage | 1 mi | 0.1 |
| Grantwood VillageTown | 1.5 mi | 0.8 |
| Green ParkCity | 1.7 mi | 1.3 |
| MarlboroughVillage | 1.8 mi | 0.2 |
| Bella VillaCity | 2.2 mi | 0.1 |
| LemayCensus-designated place | 2.5 mi | 4.1 |
| ConcordCensus-designated place | 2.6 mi | 5.5 |
| ShrewsburyCity | 2.8 mi | 1.4 |
| CrestwoodCity | 2.9 mi | 3.6 |
| SappingtonCensus-designated place | 2.9 mi | 2.4 |
| MehlvilleCensus-designated place | 2.9 mi | 7.5 |
| Webster GrovesCity | 3.2 mi | 5.9 |
| OaklandCity | 3.8 mi | 0.6 |
| MaplewoodCity | 4.5 mi | 1.6 |
Frequently asked questions
- What county is Affton, MO in?
- Affton is in St. Louis County, Missouri.
- What ZIP codes are in Affton, MO?
- ZIP codes in or overlapping Affton include 63123.
- What is the population of Affton, MO?
- About 19,052 people live in Affton, based on American Community Survey 5-year estimates.
- What cities are near Affton?
- Nearby places include St. George (0.9 mi), Lakeshire (0.9 mi), Wilbur Park (1 mi), Grantwood Village (1.5 mi), Green Park (1.7 mi).
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023