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Affton, MO Profile: Facts & Data

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The Affton CDP⁽¹⁾ had a population of 19,052 as of 2020-2024 American Community Survey 5-Year Estimates. Affton ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Missouri. See peer rankings below.

The primary coordinate point for Affton is located at latitude 38.5506 and longitude -90.3332 in St. Louis County. The formal boundaries for the Affton Census Designated Place encompass a land area of 4.78 sq. miles and a water area of 0 sq. miles. St. Louis County is in the Central time zone (GMT -6).

The Affton Census Designated Place has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

The Affton Census Designated Place is located within Township of Concord, a minor civil division (MCD) of St. Louis County.

A Census Designated Place (CDP) is a statistical counterpart to a self-governing (incorporated) place such as a city, town, or village. A CDP is not a legal entity and has no governmental functions.

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Affton Demographic Data
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Affton, MO Data & Demographics

Source: 2020-2024 American Community Survey 5-Year Estimates

POPULATION
Total Population	19,052 (100%)
Population Density	4,169 per sq mi
Diversity Index¹	33


INCOME
Median Household Income	$79,539
Per Capita Income	$47,243
Median Home Value	$212,400

HOUSING
Total HU (Housing Units)	9,092 (100%)
Owner Occupied HU	7,029 (77.3%)
Renter Occupied HU	1,666 (18.3%)
Vacant Housing Units	397 (4.4%)

HOUSEHOLDS
Total Households	8,695
Average Household Size	2.19
Family Households	4,950 (56.9%)

NOTES

The Diversity Index estimates the likelihood that two persons chosen at random from the same area belong to different race or ethnic groups, based on five groups: Hispanic/Latino, Non-Hispanic White, Non-Hispanic Black, Non-Hispanic Asian, and Non-Hispanic Other/Multiracial. A value of 0 indicates the population belongs entirely to one group. Higher values indicate a more evenly mixed population. Calculated from U.S. Census Bureau ACS 5-year estimates (table B03002).

Affton, MO - Peer Comparisons by Rank and Percentile

The table below compares Affton to the other 1,082 incorporated cities, towns and CDPs in Missouri by rank and percentile using 2020-2024 American Community Survey 5-Year Estimates data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description	Rank	Percentile
Total Population	# 41	96th
Population Density	# 38	97th
Median Household Income	# 206	81st
Per Capita Income	# 106	90th
Diversity Index	# 223	79th

Additional comparisons and rankings can be made with a VERY EASY TO USE Missouri Census Data Comparison Tool.

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Affton, MO Profile: Facts & Data

Affton, Missouri - Basic Facts

Affton, MO Data & Demographics

POPULATION

INCOME

HOUSING

HOUSEHOLDS

Affton, MO - Peer Comparisons by Rank and Percentile

Affton, MO - Most Popular Things to Do

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