Affton, MO demographics:
population, income, and more

Total population
19,052
-4.9% year-over-year change
Median household income
$79,539/yr
2.9% year-over-year change
Housing units
9,092
-2.0% year-over-year change

Affton population

How many people live in Affton

Affton is home to 19,052 residents, according to the most recent Census data. Gender-wise, 48.9% of Affton locals are male, and 51.1% are female.

Total population
19,052
-4.9% year-over-year change
Gender ratio
Male
48.9%
9,317
Female
51.1%
9,735
Value Percent YoY change
Male 9,317 48.9% -5.8%
Female 9,735 51.1% -4.0%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Affton is 42, with the population distributed as follows: about 14.8% are children under 15, then 10.4% are in the 15 to 24 age group. Adults between 25 and 44 make up 28.2% of the population, while another 27.1% fall into the 45 to 64 bracket. Finally, around 19.5% are 65 or older.

Median age
42
Age breakdown
Under 15
14.8%
15 to 24
10.4%
25 to 44
28.2%
45 to 64
27.1%
Over 65
19.5%
Value Percent YoY change
Under 15 2,816 14.8% -8.4%
15 to 24 1,981 10.4% -6.3%
25 to 44 5,373 28.2% -5.8%
45 to 64 5,166 27.1% -2.9%
Over 65 3,716 19.5% -2.6%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Affton, 86.7% of the population are US-born citizens, while 9.2% have gained naturalized citizenship. At the same time, 4.1% of residents are non-citizens. As for race, 82.5% of locals are Caucasian, 3.2% are African American and 2.1% have Asian roots. There’s also a share of 11.2% that includes residents with two or more races.

Citizenship
U.S.-born citizens
86.7%
Non-U.S.-born citizens
9.2%
Non-citizens
4.1%
Value Percent YoY change
U.S.-born citizens 16,519 86.7% -2.4%
Non-U.S.-born citizens 1,755 9.2% -19.6%
Non-citizens 778 4.1% -16.7%
Racial breakdown
White
82.5%
Black or African American
3.2%
American Indian and Alaska Native
0%
Asian
2.1%
Native Hawaiian and other Pacific Islander
0%
Two or more races
11.2%
Other
1%
Value Percent
White 15,711 82.5%
Black or African American 610 3.2%
American Indian and Alaska Native 1 0%
Asian 404 2.1%
Two or more races 2,143 11.2%
Other 183 1%

Households in Affton

A peek inside Affton households

Affton has 8,695 households, with an average of 2 members in each. Of these, 56.9% are families, while the remaining 43.1% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
8,695
-1.9% year-over-year change
Average people per household
2
Non-family households
3,745
Family households
4,950
Value Percent YoY change
Non-family households 3,745 43.1% 3.0%
Family households 4,950 56.9% -5.3%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Affton

The housing landscape of Affton

Affton's housing consists of 9,092 units, with 83% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 1.8% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 0.5% of the housing landscape.

Housing units
9,092
-2.0% year-over-year change
Housing types
Value Percent
1 unit, detached 7,542 83%
1 unit, attached 165 1.8%
2 units 108 1.2%
3 or 4 units 483 5.3%
5 to 9 units 368 4%
10 to 19 units 142 1.6%
20 to 49 units 70 0.8%
50 or more units 165 1.8%
Mobile home 49 0.5%
Homes built since 2020
27
-68.6% year-over-year change

The age of buildings in Affton

In Affton, the median construction year is 1958. About 8.5% of homes were built before the 1940s, with another 15.2% going up by 1949. Most development happened in the second half of the 20th century. Then, 2.4% of homes were added from 2000 to 2009, 2.8% between 2010 and 2019, and 0.3% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 776 8.5% 15.5%
Built between 1940 and 1949 1,377 15.2% -2.6%
Built between 1950 and 1959 2,820 31% -4.0%
Built between 1960 and 1969 1,863 20.5% -4.0%
Built between 1970 and 1979 733 8.1% -7.0%
Built between 1980 and 1989 439 4.8% -1.1%
Built between 1990 and 1999 588 6.5% -2.3%
Built between 2000 and 2009 218 2.4% -5.2%
Built between 2010 and 2019 251 2.8% 53.0%
Built in 2020 or later 27 0.3% -68.6%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Affton occupancy rates

Out of the 8,695 occupied housing units in Affton, 80.8% are owner-occupied, while 19.2% are lived in by tenants. Meanwhile, 4.4% of all homes on the local market sit vacant.

Occupied housing units
8,695
-1.9% year-over-year change
Occupancy breakdown
Renter occupied
1,666
Owner occupied
7,029
Value Percent YoY
change
Renter occupied 1,666 19.2% -3.4%
Owner occupied 7,029 80.8% -1.5%
Unoccupied housing units
4.4%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Affton housing costs

Housing costs in Affton come to a median of $1,160 per month, while tenants specifically pay a median gross rent of $1,015.

Median housing costs per month
$1,160/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Affton
$1,015/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Affton

Affton education at a glance

About 27.6% of the population in Affton went to high school, while 23.1% pursued college studies. Another 9.9% earned an associate degree and 22% hold a bachelor’s. Meanwhile, 14.3% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 504 3.2% 15.9%
High school diploma 4,339 27.6% -5.2%
College diploma 3,624 23.1% -5.2%
Associate degree 1,550 9.9% -16.3%
Bachelor's degree 3,458 22% 2.1%
Graduate degree 2,243 14.3% 1.4%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Affton

How much people earn in Affton

The average annual household income in Affton was $101,652 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +3.6% change from the previous year. At the same time, the median income stood at $79,539, reflecting a +2.8% shift over the same period.

Average household income in Affton
$101,652/year
3.6% year-over-year change
Median household income in Affton
$79,539/year
2.9% year-over-year change

Affton income by age

In Affton, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $94,702. Those with someone between 45 and 64 in charge, often well established professionally, earn $90,904 overall. Overall, 93.3% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
25 - 44 $94,702 -0.5%
45 - 64 $90,904 -4.8%
Over 65 $52,740 4.3%
Above poverty level
17,639
Below poverty level
1,266
Value Percent YoY
change
Above poverty level 17,639 93.3% -5.3%
Below poverty level 1,266 6.7% 15.4%

Average renter income in Affton

To get a better sense of what renters earn on average in Affton, their median household income was $44,597 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 27.3%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$44,597
Rent-to-income ratio
27.3%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Affton

Workforce and job types in Affton

The job market in Affton is powered by 11,360 working residents, spread across a range of industries and roles. 80.5% of the working population are employed in professional or administrative positions, while 19.5% are in hands-on or service-based jobs. Also, 6.5% run their own businesses, 72.4% are employed by private companies, and 8.8% work in the public sector.

Workforce demographics

Working population
11,360
-3.2% year-over-year change
White collar
9,146
Blue collar
2,214
Value Percent YoY change
White collar 9,146 80.5% -1.5%
Blue collar 2,214 19.5% -9.7%
Employer type
Self employees
6.5%
Private companies
72.4%
Governmental workers
8.8%
Not for profit companies
12.4%
Value Percent YoY change
Self employees 736 6.5% -14.6%
Private companies 8,220 72.4% -2.2%
Governmental workers 995 8.8% 0.4%
Not for profit companies 1,409 12.4% -4.7%
Unemployment rate
1.5%
-43.2% year-over-year change

Available workforce

The unemployment rate in Affton stands at 1.5%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Affton

How people get around in Affton

Commuting methods vary: 84.9% of residents travel by personal vehicle and 0.7% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 9,403 84.9% -6.2%
Bus or trolleybus 52 0.5% -13.3%
Subway or elevated 19 0.2% N/A
Bicycle 48 0.4% 152.6%
Walk 79 0.7% -16.0%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

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FAQs about Affton demographics 

What is the total population of Affton?

Affton has a total population of 19,052 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -4.9% compared to a year ago.

What is the gender ratio in Affton?

The gender ratio in Affton is as follows:
  • 48.9% males (9,317 residents)
  • 51.1% females (9,735 residents)

What is the median age in Affton?

The median age in Affton is 42.

What is the age distribution of the population in Affton?

The age distribution in Affton is as follows:
  • Under 15: 14.8% (2,816 residents)
  • Ages 15-24: 10.4% (1,981 residents)
  • Ages 25-44: 28.2% (5,373 residents)
  • Ages 45-64: 27.1% (5,166 residents)
  • Over 65: 19.5% (3,716 residents)

What is the racial and ethnic makeup of Affton?

The racial and ethnic makeup of Affton is as follows:
  • White: 82.5% (15,711 residents)
  • Black or African American: 3.2% (610 residents)
  • American Indian and Alaska Native: 0% (1 residents)
  • Asian: 2.1% (404 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 11.2% (2,143 residents)
  • Other: 1% (183 residents)

What percentage of the population in Affton are U.S.-born citizens?

U.S.-born citizens represent 86.7% of the population in Affton.

How many housing units are there in Affton?

There are 9,092 housing units in Affton, reflecting a -2.0% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Affton and what is the average household size?

Affton has a total of 8,695 households, with an average of 2 people in each.

What is the median household income in Affton?

Affton has a median household income of $79,539, representing a +2.9% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Affton?

The employment rate is 98.5% in Affton, with a workforce of 11,360 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 80.5% (9,146 residents)
  • Blue-collar workers: 19.5% (2,214 residents)

Places of employment:
  • Self-employed: 6.5% (736 residents)
  • Private companies: 72.4% (8,220 residents)
  • Governmental workers: 8.8% (995 residents)
  • Not-for-profit companies: 12.4% (1,409 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025