Affton, MO Community Profile: Data

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Affton, Missouri - Basic Facts

Affton is the common name for the community and surrounding area while the formal official name is the Affton Census Designated Place.

It is a community or populated place (Class Code U5) located in St. Louis County at latitude 38.5506 and longitude -90.3332. St. Louis County is in the Central time zone (GMT -6). The elevation is 620 feet.

The formal boundaries for the Affton Census Designated Place (see map) encompass a land area of 4.78 sq. miles and a water area of 0 sq. miles.

Camera Icon Photos of the local Affton, MO area

Also See: Affton, MO ZIP Codes and ZIP Code Maps

Affton, MO Data & Demographics (As of July 1, 2014)


Total Population 20,378
Population in Households 20,376
Population in Familes 15,567
Population in Group Qrtrs 2
Population Density1 4,426
Diversity Index2 17


Total Households 8,913
Average Household Size 2.29
Family Households 5,263
Average Family Size 3


Total Housing Units 9,413 (100%)
Owner Occupied HU 6,703 (71.2%)
Renter Occupied HU 2,210 (23.5%)
Vacant Housing Units 500 ( 5.3%)
Median Home Value $170,121
Average Home Value $184,664


Median Household Income $50,968
Average Household Income $63,204
Per Capita Income $27,965
  (Compound Annual Growth Rates)


2010-2014 2014-2019
Population 0.08% 0.15%
Households 0.2% 0.16%
Families -0.68% -0.01%
Median Household Income   2.39%
Per Capita Income   2.76%
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, 2014 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 # 35 97th
Population Density1 # 37 97th
Diversity Index2 # 311 70th
Median Household Income # 248 76th
Per Capita Income # 123 88th

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