Affton, MO Profile: Facts, Map & Data


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Affton, Missouri - Basic Facts

The Affton Census Designated Place had a population of 20,294 as of July 1, 2015. Affton ranks in the upper quartile for Population Density 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 38.5494 and longitude -90.3256 in St. Louis County. The formal boundaries for the Affton Census Designated Place (see map below) 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 elevation is 620 feet.

The Affton Census Designated Place (GNIS ID: 2393314) 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.

Beneath the boundary map are tables with Affton population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2015.

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.


Affton Census Designated Place, MO Boundary Map

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Boundary Maps: Township of Concord | St. Louis County | Missouri Counties

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Affton, MO Data & Demographics (As of July 1, 2015)


Total Population 20,294
Population in Households 20,292
Population in Familes 15,512
Population in Group Qrtrs 2
Population Density1 4,407
Diversity Index2 18


Total Households 8,883
Average Household Size 2.28
Family Households 5,261
Average Family Size 3


Total Housing Units 9,414 (100%)
Owner Occupied HU 6,674 (70.9%)
Renter Occupied HU 2,209 (23.5%)
Vacant Housing Units 531 ( 5.6%)
Median Home Value $173,210
Average Home Value $195,794


Median Household Income $52,633
Average Household Income $65,104
Per Capita Income $28,844
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population -0.01% 0.07%
Households 0.1% 0.1%
Families -0.56% -0.02%
Median Household Income   2.99%
Per Capita Income   3.14%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.


Affton, MO - Peer Comparisons by Rank and Percentile

The table below compares Affton to the other 1,032 incorporated cities, towns and CDPs in Missouri by rank and percentile using July 1, 2015 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 # 36 97th
Population Density1 # 35 97th
Diversity Index2 # 315 70th
Median Household Income # 224 78th
Per Capita Income # 119 89th

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